Relevant bibliographies by topics / Testing samples for compressive strength

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Academic literature on the topic 'Testing samples for compressive strength'

Author: Grafiati
Published: 5 June 2025
Last updated: 24 June 2025

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Journal articles on the topic "Testing samples for compressive strength"

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Riabokon, Evgenii, Mikhail Turbakov, Evgenii Kozhevnikov, Vladimir Poplygin, and Hongwen Jing. "The Rehbinder Effect in Testing Saturated Carbonate Geomaterials." Materials 16, no. 8 (2023): 3024. http://dx.doi.org/10.3390/ma16083024.

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Carbonate geomaterial samples were tested for uniaxial compressive strength and tensile strength under air-dried and distilled-water-wet conditions. When tested for uniaxial compression, samples saturated with distilled water showed 20% lower average strength than that of air-dried samples. In the indirect tensile (Brazilian) test, samples saturated with distilled water showed 25% lower average strength than that of dry samples. In comparison with air-dried conditions, when the geomaterial is saturated with water, the ratio of the tensile strength to the compressive strength is decreased, mainly due to the decrease in the tensile strength caused by the Rehbinder effect.
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Sadouskaya, Alena, Syarhei Leanovich, Neli Budrevich, and Elena Polonina. "The compressive strength of steel fibre reinforced concrete obtained by testing cubes and cylinders." MATEC Web of Conferences 350 (2021): 00008. http://dx.doi.org/10.1051/matecconf/202135000008.

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There are two most popular approaches to determining the compressive strength of concrete: testing cubes, testing cylinders. The use of different samples gives different results, which are intended to characterize one parameter of the material compressive strength. The article discusses a general approach to determining the compressive strength of cylinders and cubes. The analysis of the factors influencing the transition coefficients when testing the cylinder samples with the ratio of height to diameter is less than 2. The results of testing cubes and cylinders for compression made of fiber-reinforced concrete are presented.
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Yan, Chun Ling, De Xin Ding, Yi Qun Tang, and Zhong Wei Bi. "Testing of Strength Parameters and Deformation Parameters of Surrounding Rock and their Distributions." Advanced Materials Research 261-263 (May 2011): 1360–64. http://dx.doi.org/10.4028/www.scientific.net/amr.261-263.1360.

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Cores were taken from the hanging wall of the III -1 ore body at Kangjiawan Lead, Zinc and Gold Mine. 50 samples for compression and tension tests were fabricated. 50 compressive and 50 tensile strength values were obtained by RMT-150B testing systems. The probability distributions for the compressive and tensile strength were tested by the hypothesis test method. It proves that uniaxial compressive strength follows normal distribution and tensile strength follows the lognormal distribution. And it proves that elastic modulus and Poson’s ratio follow normal distribution. 50 pairs of cohesion and internal friction angle were obtained by randomly drawing a uniaxial compressive and tensile strength samples from 50 measured values. Cohesion follows lognormal distribution and internal friction angle follows normal distribution through hypothesis test method. With the results, some references can be conveniently provided for prediction of the strength and distribution of similar rocks in related geotechnical projects.
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Alanazi, Khalid K., Abdulaziz A. Alzaid, Ali A. Elkaffas, et al. "Mechanical Assessment of CAD/CAM Fabricated Hybrid Ceramics: An In Vitro Study." Applied Sciences 14, no. 17 (2024): 7939. http://dx.doi.org/10.3390/app14177939.

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The current study aimed to compare the mechanical properties of CAD/CAM fabricated hybrid ceramic restorative materials. The current study assessed the mechanical properties of additively and subtractively manufactured CAD/CAM fabricated hybrid ceramic by conducting flexure strength test, compressive strength test, and Vickers hardness test. Flexural samples were subjected to a three-point bending test using a universal testing machine until the samples showed fracture. Moreover, samples for the compressive strength test were subjected to compression tests using a universal testing machine until samples were fractured. Samples for the Vickers hardness was tested using the Vickers hardness testing machine to determine the sample’s hardness values. There were significant differences (p = 0.0001) were observed among the additive and subtractive groups in terms of flexure strength and compressive strength test. Regarding the Vickers hardness test, significant differences (p = 0.0001) were observed between the polished and unpolished groups in additive manufacturing. However, no significant (p = 0.681) differences were observed in the subtractive manufacturing technique. The subtractive group achieved ISO specifications in terms of flexural strength and was superior to additive groups in hardness while exhibiting lower performance in compressive strength. Moreover, printing orientation had a significant influence on the performance of additive groups. Flexural strength and hardness were improved when the printing orientation was in alignment with the direction of load (90°) while compressive strength was improved when the printing orientation was perpendicular to the direction of load (0°).
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Dinesh Karthik V and Rahmath Meeral P. "COMPARATIVE EVALUATION OF COMPRESSIVE STRENGTH OF CENTION N AND TYPE IX GLASS IONOMER CEMENT – AN INVITRO STUDY." International Journal of Community Dentistry 10, no. 1 (2022): 52–55. http://dx.doi.org/10.56501/intjcommunitydent.v10i1.111.

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BACKGROUND: This study aimed to compare the compressive strength of glass-ionomer cement (GIC) Type IX and Cention N. METHODS: Five samples each of GIC Type IX and Cention N were prepared for testing the compressive strength. Cylinders of the samples measuring 1 cm diameter and 6 mm height were prepared for compressive strength. Testing was done by mounting the samples in a universal testing machine with a crosshead speed of 1 mm/min. RESULTS: The mean compressive strength of Type IX GIC (n=10) was 94.010 with standard deviation ±15.654 while the mean compressive strength of Cention V (n=10) was 125.567 with standard deviation ± 7.890. The values of the compressive strength Cention N were statistically significant (P < 0.5) as compared to GIC Type IX. CONCLUSION: The results suggest significantly higher values for mechanical properties of Cention N as compared to GIC Type IX.
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Richter-Menge, J. A. "Confined Compressive Strength of Horizontal First-Year Sea Ice Samples." Journal of Offshore Mechanics and Arctic Engineering 113, no. 4 (1991): 344–51. http://dx.doi.org/10.1115/1.2919940.

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A total of 110 first-year sea ice samples from Prudhoe Bay, Alaska, were tested in unconfined and confined constant strain rate compression. All of the tests were performed in the laboratory on a closed-loop electrohydraulic testing machine at −10°C. The confined tests were performed in a conventional triaxial cell (σ1>σ2=σ3) that maintained a constant ratio between the radial and axial stress (σ2/(σ1)=constant) to simulate true loading conditions. Three strain rates (10−2, 10−3, and 10−5/s) and three σ2/σ1 ratios (0.25, 0.50, and 0.75) were investigated. This paper summarizes the field sampling and testing techniques and presents data on the effect of confinement on the compressive strength, initial tangent modulus, and failure strain of the ice.
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Gustina, Gustina, Muhammad Sodri Renjani, Ari Endra Nasatian, Darul Kutni, and Doli Jumat Rianto. "Perbandingan Kuat Tekan Beton Menggunakan Campuran Sirtu Terhadap Beton Normal." Jurnal Talenta Sipil 8, no. 1 (2025): 451. https://doi.org/10.33087/talentasipil.v8i1.838.

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The existence of sirtu in the open air is the main choice, it is easy to find, but sometimes it is not known what the ideal percentage is needed to add sirtu as an additional mixture in making concrete according to the desired concrete quality. This type of research is quantitative research with an experimental method to determine the comparison of the compressive strength of concrete with the addition sand and stone in the concrete mixture against normal concrete. A sample of 27 test specimens with concrete age tolerance testing carried out at the ages of 7, 14 and 28 days. The comparison of optimum concrete compressive strength will be seen on the 28th day using a compressive strength test tool in the form of a hammer test and compression testing machine. The test results using the hammert test tool on normal concrete samples were 251.23 kg/cm2, the addition of 25% sirtu obtained 225.50 kg/cm2 and the addition of 50% sirtu obtained a compressive strength test of 221.86 kg/cm2. Meanwhile, testing with a compression testing machine on normal concrete samples obtained 278.04 kg/cm2, adding 25% sirtu obtained 273.51 kg/cm2 and adding 50% sirtu obtained a compressive strength test of 242.44 kg/cm2. Overall, the concrete compressive strength test tool for the variables used showed a decrease in the results of the normal concrete compressive strength test along with the addition of the percentage of sirtu, but still in accordance with the quality standards of the concrete produced above 20 MPa which was measured on days 7, 14, and 28. Overall, the concrete compressive strength test tool for the variables used shows a decrease in the results of the normal concrete compressive strength test along with the addition of the percentage of sirtu, meaning that the higher the percentage of sirtu used, the lower the compressive strength of the concrete produced along with the increasing age of the concrete, but still in accordance with the quality standards of the concrete produced above 20 MPa which is measured on the 7th (seventh), 14th (fourteenth), and 28th (twenty-eighth) days.
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Trejbal, Jan, Lubomír Kopecký, and Štěpán Potocký. "Compressive Strength of Lime-Based Mortars Reinforced by Micro Glass Fibers." Applied Mechanics and Materials 827 (February 2016): 292–95. http://dx.doi.org/10.4028/www.scientific.net/amm.827.292.

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Glass fiber-reinforced lime-based mortars have been studied. Two different fiber reinforcement amounts were used as an addition to the mixtures. Compressive strength and post-cracking behavior of mortars were observed and compared with reference mixture without any reinforcement (marked R). The fibers were added in the amount of 1.8 kg/m3 (mortar samples MA) and 93.75 kg/m3 (mortar samples MB). Destructive compression tests were chosen to compare the performance of the individual mixtures. The maximum compressive strength reached during the testing was the highest for reference samples, while those samples together with MA exhibited the elastic-brittle behavior. Only MB had post-linear hardening behavior and after reaching the maximum compressive strength a slow softening was present.
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Misa, Rafał, and Andrzej Nowakowski. "Comparison of the Compressive and Tensile Strength Values of Rocks Obtained on the Basis of Various Standards and Recommendations." Symmetry 13, no. 7 (2021): 1163. http://dx.doi.org/10.3390/sym13071163.

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The objective of the current study was to compare results relating to the compressive and tensile strength of rocks obtained during research undertaken according to Polish Standards (as part of the European standards known as Eurocodes), American Society for Testing and Materials (ASTM) Standards, and the recommendations of the International Society for Rock Mechanics (ISRM). A total of 130 experiments for uniaxial compression on axisymmetric samples, point loads, and transverse compression (so-called Brazilian tests) were performed on rock samples comprising granite, limestone, and sandstone. Geometric properties of the samples were selected depending on the applied research method, and the relationship between the specimen’s slenderness and shape, and the obtained values of compressive and tensile strength, were analyzed. The results of the study showed that values of compressive and tensile strength obtained in a laboratory depend significantly on specimen slenderness, different values of which are imposed by various ISRM standards and recommendations, wherein this sensitivity was much higher in the case of compressive strength. The study also raised doubt about the usefulness of the so-called point load test as a method for determination of the compressive strength of rocks and potential estimation of the tensile strength.
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Belouadah, Messaouda, Zine Elabidine Rahmouni, Nadia Tebbal, and Mokrani El Hassen Hicham. "Evaluation of Concretes Made with Marble Waste Using Destructive and Non-Destructive Testing." Annales de Chimie - Science des Matériaux 45, no. 5 (2021): 361–68. http://dx.doi.org/10.18280/acsm.450501.

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The present study aims primarily to investigate the possibility of assessing the physico-mechanical behavior of concrete incorporating marble waste or marble powder as a partial replacement for cement using destructive and non-destructive testing methods. Indeed, in this work, cement was partially replaced with marble powder at six different substitution levels, i.e. 5, 10, 15, 20, 25 and 30% by weight, with 1.5% adjuvant (super plasticizer) for each mixture. The samples prepared were then analyzed. In addition, the physico-mechanical properties, in the fresh and hardened states, water-to-cement ratio, absorption and compressive strengths of the concrete samples were examined as well. Moreover, the compressive strength of concrete was assessed through non-destructive testing methods such as the ultrasonic pulse velocity and rebound hammer. Likewise, the relationship between the ultrasound velocity and compressive strength of concrete were also estimated after 3, 7, 28 and 90 days of curing. The findings of the study indicated that, at early age of curing, the values of the compressive strength and ultrasonic pulse velocity were quite small for all replacement levels, of cement with marble powder, between 15 and 30%. Nevertheless, when the curing period was increased, the compressive strength and ultrasonic pulse velocity of all the samples went up as well. In the end, a linear relationship was observed between the ultrasonic pulse velocity and compressive strength for all substitution levels of cement with marble powder.
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Dissertations / Theses on the topic "Testing samples for compressive strength"

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Nijem, Abdelaziz. "ARTIFICIAL INTELLIGENCE NEURAL NETWORK: COMPRESSIVE STRENGTH PREDICTION OF RECYCLED AGGREGATE CONCRETE SAMPLES." Cleveland State University / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=csu161022170304632.

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Mirzadeh, Farshad. "Compressive strength and behavior of 8H C3000/PMR15 woven composite material." Diss., Virginia Polytechnic Institute and State University, 1988. http://hdl.handle.net/10919/54337.

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Center-notched and unnotched specimens cut from Celion 3000/PMR15 woven composite panels with 60% fiber volume fraction were tested under quasi-static compressive load to failure at room temperature. Micrographic evidence clearly identifies the mode of compressive failure as fiber kinking. Each fiber in the kink fractures because of a combination of compressive and shear stresses. A post failure mechanism follows the local fiber bundle failures, which completely deforms the material by large cracks. ln center notched specimens, fiber kinks start from the notch and propagate to some distance from the notch before the post failure takes place. The effect of bundle interactions on stresses and strains was clearly distinguished by comparing the results of the finite element analysis of a bundle surrounded by other plies to the results of the Moire interferometry on the edge of a laminate. A model was introduced which incorporated the micromechanical geometry as well as the constituent properties to predict the notched and unnotched compressive strengths of the woven material. For notched strength predictions, the Average Stress Criterion was used, and the characteristic distance was found to be a function of laminate thickness. Predicted notched and unnotched strengths correlate very well with the experimental results.<br>Ph. D.
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Dean, Maureen A. "Predictions of Distal Radius Compressive Strength by Measurements of Bone Mineral and Stiffness." Ohio University Art and Sciences Honors Theses / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=ouashonors1461595642.

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Hess, Paul E. "Uncertainty in marine structural strength with application to compressive failure of longitudinally stiffened panels." Thesis, This resource online, 1994. http://scholar.lib.vt.edu/theses/available/etd-01242009-063009/.

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Deda, Hugo. "The Influence of the Binder Type & Aggregate Nature on the Electrical Resistivity and Compressive Strength of Conventional Concrete." Thesis, Université d'Ottawa / University of Ottawa, 2020. http://hdl.handle.net/10393/41463.

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Concrete has been used in a number of civil engineering applications due to its interesting fresh, hardened, and durability-related properties. 28-day compressive strength is the most important hardened state property and is frequently used as an indicator of the material’s quality. However, early-age mechanical properties are a key factor nowadays to enhance construction planning. Several advanced techniques have been proposed to appraise concrete microstructure and quality, and among those electrical resistivity (ER) is one of the most commonly used since it is a non-destructive and low-cost technique. Although recent literature data have shown that ER may be significantly influenced by a variety of parameters such as the test setup, material porosity and moisture content, binder type/amount and presence of supplementary cementing materials (SCMs) along with the nature of the aggregates used in the mix, further research must be performed to clarify the influence of the raw materials (i.e. SCMs and aggregate nature) on ER using distinct setups. Therefore, this work aims to appraise the influence of the coarse aggregate nature and binder replacement/amount on the concrete ER and compressive strength predictions models through ER. Twenty-four concrete mixtures were developed with two different coarse aggregate natures (i.e. granite and limestone), two different water-to-binder ratios (w/b; i.e. 0.6 and 0.4) and incorporating two different SCMs (i.e. slag and fly-ash class F) with different replacement levels. Moreover, three distinct ER techniques (e.g. bulk, surface, and internal) and compressive strength tests were performed at different ages (i.e. 3, 7, 14, and 28 days). Results indicate that the binder type and replacement amount significantly affect ER and compressive strength. Otherwise, the coarse aggregate nature presented only trivial influence for 0.6 w/b mixes, except for 50% fly-ash replacement samples; whereas for concrete specimens with enhanced microstructure (i.e. 0.4 w/b), the aggregate nature influence was statically significant especially for the binary mixtures with high SCMs replacement levels (i.e. 70% GGBS and 50% fly-ash). Finally, all ER test setups were considered to be quite suitable and reliable NDT techniques correlating themselves very well. Yet the internal resistivity setup demonstrated to be the device which yields the lowest variability amongst them.
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Chitti, Abhishek. "ASSESS MATERIAL PROPERTIES OF CONCRETE USING COMBINED NDT METHODS." OpenSIUC, 2019. https://opensiuc.lib.siu.edu/theses/2490.

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The aim of this research is to assess the material properties of concrete like modulus of elasticity, compressive strength, and Poisson’s ratio using various nondestructive Testing (NDT) methods like Ultrasonic Pulse Velocity (UPV) and Rebound Hammer (RH). Assessment of material properties of concrete is very important as they are used for structural design process. Various NDT methods are applied to ensure the quality of concrete specimens but they can also be used to find material properties. UPV is a NDT method which is used to test the internal condition of the concrete specimen. RH is a surface hardness testing method and can be used to test the homogeneity of the specimen. For this study, several batches of concrete samples with three different design strengths of 6000 psi, 8000 psi, and 12000 psi were casted. Modulus of elasticity and Poisson’s ratio were calculated from UPV P-wave and S-wave velocities. A Nomogram was developed by combining the longitudinal ultrasonic pulse velocities, rebound numbers, and compressive strengths measured from UPV, RH, and compressive strength tests respectively. This combined NDT correlation curve (Nomogram) can be used to estimate compressive strength of concrete if UPV and rebound values are known. The accuracy of these NDT methods were determined by comparing estimated strength to the actual strength. Furthermore, the effect of moisture content on UPV and rebound values was reviewed and also studied dynamic modulus of elasticity and its relation with static modulus of elasticity of the concrete was investigated for better understanding.
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Murray, Eric B. "Dry Stacked Surface Bonded Masonry - Structural Testing and Evaluation." Diss., CLICK HERE for online access, 2007. http://contentdm.lib.byu.edu/ETD/image/etd2188.pdf.

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Lorenzi, Alexandre. "Aplicação de redes neurais artificiais para estimativa da resistência à compressão do concreto a partir da velocidade de propagação do pulso ultra-sônico." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2009. http://hdl.handle.net/10183/25985.

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Os ensaios não destrutivos servem como uma importante ferramenta para a análise de estruturas de concreto armado. A utilização de ensaios de velocidade de propagação do pulso ultra-sônico (VPU) permite realizar um acompanhamento das características do material ao longo de sua vida útil. Através da análise dos dados obtidos, pode-se averiguar a uniformidade do concreto, controlar a sua qualidade, acompanhar sua deterioração e, através de comparação com corpos de prova de referência e, até mesmo, estimar a resistência do mesmo. No entanto, as técnicas atuais para análise dos resultados coletados são, em grande parte, baseadas na sensibilidade dos profissionais que as aplicam. Para facilitar o controle e inspeção de estruturas de concreto armado é fundamental desenvolver estratégias para tornar esta análise mais simples e precisa. Este trabalho se baseia na hipótese de que a aplicação de Redes Neurais Artificiais (RNAs) pode gerar modelos de relacionamento úteis e acurados entre as características do concreto, sua compacidade e sua resistência à compressão. O intuito é determinar se com o uso de RNAs é possível estabelecer relações não-lineares que permitam estimar a resistência do concreto a partir do conhecimento de algumas propriedades básicas e da verificação da sua compacidade por meio de ensaios de VPU. Os resultados indicam que as RNAs podem ser usadas para gerar métodos numéricos robustos e flexíveis para estimativa da resistência à compressão a partir de dados de VPU. O estudo evidencia uma considerável melhora nos resultados de estimação da resistência quando se empregam modelos neurais, em comparação a modelos estatísticos tradicionais. Para os dados coletados, provenientes de diversas pesquisas, os modelos tradicionais geram estimativas com coeficientes de determinação que não ultrapassam um valor de R² de 0,40. Já as redes neurais conseguem ajustes com R² da ordem de 0,90. Além de contribuir para uma melhor análise de situações em que haja dúvidas sobre a resistência ou homogeneidade de elementos de concreto, o trabalho demonstra que modelos neurais são uma forma eficiente de ordenar e transferir conhecimento não estruturado. Constatou-se, ainda, que, dada sua capacidade de aprendizagem e de generalização do conhecimento adquirido, as RNAs se constituem em um meio rápido e preciso para modelagem de fenômenos complexos.<br>Nondestructive Testing (NDT) techniques are useful tools for analyzing reinforced concrete (RC) structures. The use of Ultrassonic Pulse Velocity (UPV) measurements enables the monitoring of changes in some critical characteristics of concrete over the service life of a structure. The interpretation of the data collected allows an assessment of concrete uniformity, and can be used to perform quality control, to monitor deterioration and even, by means of comparison against reference samples, to estimate compressive strength. Nonetheless, the current techniques for UPV data analysis are, on a large degree, based on the sensitivity of the professionals who apply these tests. For accurate diagnosis it is necessary to consider the various factors and conditions that can affect the results. To proper control and inspect RC facilities it is essential to develop appropriate strategies to make the task of data interpretation easier and more accurate. This work is based on the notion that using Artificial Neural Networks (ANNs) is a feasible way to generate workable estimation models correlating concrete characteristics, compacity and compressive strength. The goal is to determine if it is possible to establish models based on non-linear relationships that are capable of estimating with good accuracy the concrete strength based on previous knowledge of some basic material characteristics and UPV measurements. The study shows that this goal is achievable and indicates that neural models perform better than traditional statistical models. For the data collected in this work, provided by various researchers, traditional regression models cannot exceed R² = 0.40, while the use of ANNs allows the creation of models that can reach a determination coefficient R² = 0.90. The results make clear that, besides contributing to better the analysis of situations where there is doubts regarding concrete strength or uniformity, neural models are an efficient way to order and transfer unstructured knowledge. It was shown that, given the learning capacity and its ability to generalize acquired information into mathematical patterns, ANNs are a quick and adequate way to model complex phenomena.
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Bryne, Lars Elof. "Time dependent material properties of shotcrete for hard rock tunnelling." Doctoral thesis, KTH, Betongbyggnad, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-145678.

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In this thesis different mechanical properties for shotcrete (sprayed concrete) such as compression strength, bond strength, bending tensile strength, elastic modulus, free and restrained shrinkage as a function of its age was investigated. One of the main issues was to investigate the difference between ordinary cast concrete and shotcrete. Reliable material data for young and hardening shotcrete is scarce which in the past have made such comparisons difficult. Also, less accurate data representative for cast concrete has often been used in numerical modelling and design analyses. The focus of the project has particularly been on the properties bond strength and restrained shrinkage for which two new testing methods has been developed and evaluated. Microstructural studies have also been performed as a complement to the bond strength testing. The bond to rock is one of the most important properties for shotcrete used as rock reinforcement. During the very first time after spraying the physical properties and the bond to the rock depend on the set accelerator and the micro structure that is formed. The investigation of early age bond strength of shotcrete is of great importance both from a production perspective and a safety perspective. The newly developed method was tested and evaluated and proved that it can be used for bond strength testing already from a couple of hours after shotcreting. The bond, or adhesion, depends on several factors such as texture of the rock, the type of accelerator, application technique, etc. In this work the development of the microstructure in the interfacial transition zone (ITZ) and strength of the bond was investigated. The results show that the bond strength is related to the hydration process, i.e. the strength gain of the shotcrete. The early development of the ITZ was here studied using a scanning electron microscope (SEM) making it possible to observe changes over time, before and after proper cement hydration. Restrained shrinkage cracking of shotcrete, especially in the case of shotcrete sprayed on soft drains that are parts of a tunnel lining not continuously bonded to the rock, can be detrimental for the sustainability of an infrastructure tunnel system. Maintenance and repair costs can be high over time. It is shown that the developed test method realistically captures the behaviour of shotcrete drains on hard rock in situ. The method can be used in the evaluation of different technical solutions for avoiding or minimizing shrinkage cracks in shotcreted soft drains. It can also be used to assess the performance of shotcrete fully bonded to a rock surface, with respect to the ability to prevent cracking or to distribute possible shrinkage damage into several fine cracks instead of one wide.<br><p>QC 20140526</p>
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Kozáček, Vojtěch. "Experimentální stanovení závislosti parametrů NDT a pevnosti v tlaku betonu." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2020. http://www.nusl.cz/ntk/nusl-409957.

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The diploma thesis deals with non-destructive testing of concrete as well as with the relationship between determined parameters and the compressive strength of concrete. The thesis is mainly focused on the ultrasonic pulse velocity method and the rebound hammer test. The experimental part of the thesis describes non-destructive tests performed on concrete blocks. The compressive strength was tested on the drill cores taken from the concrete blocks. The aim of this thesis is to find regression models of the relationship between the compressive strength and non-destructive parameters, and the subsequent analysis of the results.
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Books on the topic "Testing samples for compressive strength"

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Gürdal, Zafer. A compressive failure model for anisotropic plates with a cutout under compressive and shear loads: Final technical report. National Aeronautics and Space Administration, 1985.

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Standards Association of Australia. Committee BD/42, Methods of Testing Concrete. Methods of testing concrete: Determination of the compressive strength of concrete specimens. 3rd ed. Standards Australia, 1999.

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Canadian Society of Civil Engineers., ed. The compressive strength of concrete: As determined by tests made at McGill University. s.n., 1986.

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M, Neilson R., U.S. Nuclear Regulatory Commission. Office of Nuclear Regulatory Research. Division of Regulatory Applications., Idaho National Engineering Laboratory, and Lockheed Idaho Technologies Company, eds. The effects of aging on compressive strength of low-level radioactive waste form samples. Division of Regulatory Applications, Office of Nuclear Regulatory Research, U.S. Nuclear Regulatory Commission, 1996.

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Alexander, A. Michel. Accuracy of estimating compressive strength of deteriorated concrete seawall by nondestructive evaluation (NDE). U.S. Army Engineer Waterways Experiment Station, 1998.

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Laungrungrong, Busaba. Development of rational pay factors based on concrete compressive strength data. Arizona Dept. of Transportation, 2008.

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Geological Survey (U.S.), ed. Unconfined compressive strength on rock samples representative of the types found in Bronx County, New York. U.S. Dept. of the Interior, Geological Survey, 1987.

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Materials Engineering and Research Laboratory (U.S.), ed. Effects of various fly ashes on compressive strength, resistance to freezing and thawing, resistance to sulfate attack, and adiabatic temperature rise of concrete. Materials Engineering and Research Laboratory Group, Civil Engineering Services, Technical Service Center, U.S. Dept. of the Interior, Bureau of Reclamation, 1995.

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L, Bradley Walter, and United States. National Aeronautics and Space Administration., eds. Experimental observations and finite element analysis of the initiation of fiber microbuckling in notched composite laminates: An annual progress report. Center for Mechanics of Composites, Texas A&M University, 1989.

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United States. National Aeronautics and Space Administration., ed. Compression strength of composite primary structural components: Semiannual status report, performance period, May 1, 1992 to October 31, 1992. Aerospace and Ocean Engineering Dept., Virginia Polytechnic Institute and State University, 1992.

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Book chapters on the topic "Testing samples for compressive strength"

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Gulabbhai, Dhruv Parbhoo, Deon Kruger, and Mayur Kishor Hira. "Testing the Performance of Vinyl Ester and Polyester Polymer Concrete Following Exposure to Artificially Induced Climatic Environments." In Springer Proceedings in Materials. Springer Nature Switzerland, 2024. http://dx.doi.org/10.1007/978-3-031-72955-3_55.

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AbstractThe exposure of polymer concrete to artificially designed environmental conditions of high-and low-temperatures, and moisture levels allowed for the assessment of strength performance and aesthetic value. Strength performance indicated the maximum capability of the product to carry a load successfully, whereas the aesthetics assessed the appearance of the product, that can be measured using spectrophotometry. In this study, materials such as water and Portland cement typically used to form traditional concrete were replaced by two polymer resins namely - vinyl ester and polyester, thus making it polymer concrete. As such, compressive strengths of cube samples were tested, the change in cubes’ masses was measured using a balance - prior and post exposure to the artificially induced environments, the colour change tests (spectroscopy analysis) were performed using the spectrophotometer tests. Compressive strengths of over 75MPa were achieved, thereby justifying promising concrete strengths. Mass losses recorded were almost negligible, thereby showing toughness to conditions presented in the artificially induced environments. Minor colour changes were noticed- thereby showing a good resistance to harsh weather conditions on the surface properties. Therefore, the assessed products displayed desired characteristics for strength performance and aesthetic value, subsequently, creating a product that promotes sustainability.
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Behforouz, Babak, Davoud Tavakoli, Behrouz Naderi, and Mohammad Hajmohammadian Baghban. "Sustainable Enhancement of Lightweight Concrete: A Comprehensive Investigation into GGBS and Waste Steel Fiber Incorporation for Improved Strength and Durability." In Lecture Notes in Civil Engineering. Springer Nature Switzerland, 2025. https://doi.org/10.1007/978-3-031-69626-8_68.

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AbstractThis study explores the properties of lightweight concrete incorporating slag and steel fibers. Cubic and cylindrical specimens were created with varying fiber percentages (0%, 1.5%, and 3%) and slag replacements (0%, 10%, 20%, 30%, and 40%). The samples underwent testing for compressive strength at 7, 28, and 90 days, tensile strength at 28 and 90 days, and water absorption at 28 and 90 days. Results indicate an enhancement in both compressive and tensile strength with a 20% slag replacement in all specimens. Additionally, an inverse correlation is observed between overhead percentage and water absorption, where an increase in overhead corresponds to a decrease in water absorption. Despite no substantial impact on compressive strength, the incorporation of waste steel fibers consistently improves tensile strength across all fiber percentages. This study underscores the potential of these eco-friendly additives in promoting environmentally conscious construction practices, aligning with the principles of sustainable development in the concrete industry.
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Tserpes, Konstantinos, Elli Moutsompegka, Mareike Schlag, et al. "Characterization of Pre-bond Contamination and Aging Effects for CFRP Bonded Joints Using Reference Laboratory Methods, Mechanical Tests, and Numerical Simulation." In Adhesive Bonding of Aircraft Composite Structures. Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-319-92810-4_2.

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AbstractIn this chapter, the pre-bond contamination and ageing effects on carbon fiber reinforced plastic (CFRP) adherends and CFRP bonded joints are characterized by means of reference laboratory non-destructive testing (NDT) methods, mechanical tests, and numerical simulation. Contaminations from two fields of application are considered, namely in aircraft manufacturing (i.e. production) and for in-service bonded repair. The production-related scenarios comprise release agent, moisture, and fingerprint, while the repair-related scenarios comprise fingerprint, thermal degradation, de-icing fluid, and a faulty curing of the adhesive. For each scenario, three different levels of contamination were pre-set and applied, namely low, medium and high level. Furthermore, two types of samples were tested, namely coupons and pilot samples (a stiffened panel and scarf repairs). The CFRP adherends were contaminated prior to bonding and the obtained surfaces were characterized using X-ray photoelectron spectroscopy. After bonding, the joints were tested by ultrasonic testing. To characterize the effects of each contamination on the strength of the bonded joints, mode-I and mode-II fracture toughness tests, and novel centrifuge tests were conducted on the coupons, while tensile tests were performed on the scarfed samples. Additionally, numerical simulation was performed on CFRP stiffened panels under compression using the LS-DYNA finite element (FE) platform.
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Ferretti, Francesca, Andrea Incerti, and Claudio Mazzotti. "Determination of Masonry Compressive Strength Properties by Testing Cores." In Lecture Notes in Civil Engineering. Springer Nature Switzerland, 2025. https://doi.org/10.1007/978-3-031-73310-9_84.

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Kępniak, Maja. "Recycled Cement Concrete as an Eco-Friendly Aggregate in Polymer Composite – Application Feasibility." In Springer Proceedings in Materials. Springer Nature Switzerland, 2024. http://dx.doi.org/10.1007/978-3-031-72955-3_20.

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AbstractOver the years, the development of sustainable and ecofriendly concrete has been found in the reuse of construction and demolition materials. One such waste is recycled aggregate from cement concrete structure demolition process. This paper analyzes the effect of substitution of natural stone aggregate with recycled aggregate in polymer composites. An experimental plan for the mixtures was prepared. Technological characteristics (setting course, consistency) and strength characteristics (flexural strength and compressive strength) were analyzed. The obtained results were statistically analyzed. A generalized utility function has been established. Based on it, the maximum dosage of recycled aggregate was determined without significant deterioration of technological and strength characteristics. The average compressive strength results obtained were in the range of 88.5 to 96.5 MPa. The highest compressive strength value (96.5 MPa) was obtained for the samples with the composition with the highest proportion of recycled aggregate.
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Beushausen, Hans, Zaid Manuel, Joanitta Ndawula, and Dyllon Randall. "Feasibility of Utilizing Treated Domestic Wastewater (TDW) for the Production of Concrete." In Lecture Notes in Civil Engineering. Springer Nature Switzerland, 2025. https://doi.org/10.1007/978-3-031-69626-8_20.

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AbstractFreshwater scarcity is expected to become one of the biggest concerns globally, with the construction industry accounting for as much as 30% of global freshwater use over the life cycle of civil infrastructure today. Water management and its potential to practically alleviate water scarcity and increase the sustainability of concrete therefore need more consideration in scientific research. Existing research suggests that non-potable water such as treated domestic wastewater (TDW) could be used to produce structurally sound concrete for the construction industry. Consequently, this research study was conducted as a pilot project to assess the feasibility of utilizing treated domestic water to produce good quality and durable concrete in South Africa. Chemical analyses of the TDW samples, evaluation of the concrete setting time, slump retention and 7-day and 28-day compressive strength tests were performed in the study. While no definitive correlations of using TDW on the setting time and workability of concrete could be deduced, the majority of the recorded effects were surmised to be acceptable for the concrete industry in South Africa. In addition, while using TDW as mixing water delayed the compressive strength development of the concrete samples, the samples still attained sufficient compressive strength at 28 days to pass the stipulations of the standard. The findings of this study show that TDW produces concrete with sufficient workability, setting time, and compressive strength to be used in the local construction industry. However, quality control of the TDW is vital to ensure the consistent production of good quality concrete.
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Cristofaro, M. T., R. Pucinotti, M. Tanganelli, and M. De Stefano. "The Dispersion of Concrete Compressive Strength of Existing Buildings." In Computational Methods, Seismic Protection, Hybrid Testing and Resilience in Earthquake Engineering. Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-06394-2_16.

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Kravanja, Gregor, and Željko Knez. "Enhancing Strength and CO2 Uptake into Mortar Through Supercritical CO2 Treatment." In Lecture Notes in Civil Engineering. Springer Nature Switzerland, 2025. https://doi.org/10.1007/978-3-031-69626-8_27.

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AbstractSupercritical CO2 was utilized to accelerate the carbonation process, altering the microstructure and composition of Portland cement mortar blended with metakaolin. Mortar samples were cured in a high-pressure reactor at 323 K and 15 MPa under supercritical CO2 conditions. The results demonstrate a significant enhancement in both compressive and flexural strength for all carbonated mortar samples treated with supercritical CO2 compared to those subjected to ambient curing conditions. Furthermore, longer reaction times resulted in increased overall CO2 utilization within the mortar matrix, with more pronounced effects observed in samples containing metakaolin. Hydrated mortar samples demonstrated a complex pore system characterized by a substantial presence of small gel pores, alongside large gel and mesopores. Upon exposure to supercritical CO2, SEM micrographs revealed a rougher surface, along with the formation of CaCO3 crystals.Comprehending high-pressure carbonation is vital for several applications, such as carbon capture and storage, improving the properties of recycling concrete, and safely managing toxic elements in construction waste materials.
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Kochukrishnan, Sowmya, and Premalatha Krishnamurthy. "Estimation of Compressive Strength of Rocks Using Non-destructive Testing Methods." In Lecture Notes in Civil Engineering. Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-97-3389-7_16.

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Zhao, Yongcong, Meini Su, and Yong Wang. "Early-Day Effects of Graphene on NA2CO3: Activated GGBS Concrete." In Lecture Notes in Civil Engineering. Springer Nature Switzerland, 2025. https://doi.org/10.1007/978-3-031-69626-8_12.

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AbstractAchieving net-zero construction is curial for construction sector to mitigate the effects of climate change. Using alkali-activated materials (AAM) to replace the carbon intensive ordinary Portland cement (OPC) in concrete has attracted many researchers’ attention in the past years. However, several problems are associated with AAM, such as lower early age mechanical strength. This paper aimed to investigate the early days effects of graphene on hydration mechanism of Na2CO3-activated granulated blast-furnace slag (GGBS) concrete. Graphene dosages ranging from 0.005% to 0.02% (of slag weight) were considered in this study. The compressive strength of GGBS concrete was measured at 3 days. Samples were cured under ambient room temperature around 20 ± 3 °C. Results indicated the incorporation of graphene could increase the compressive strength up to 33%. To understand the changes on the microstructure level, various microstructure technics were performed on 3-day curing samples to provide a comprehensive understanding of the microstructure elements. X-ray diffraction (XRD) was employed to identify the composition and crystallinity of different phases. Overall, the higher gain in early-day strength of concrete and the shortened setting times are mainly due to the nucleation effect of graphene which was revealed by the much denser and compact microstructure, as shown in the SEM images.
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Conference papers on the topic "Testing samples for compressive strength"

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Benidir, Adel. "Assessment of Concrete Compressive Strength by Destructive Testing: Influence of Strength Correction Factors and Size Effect." In 2024 10th International Conference on Architecture, Materials and Construction & 2024 5th International Conference on Building Science, Technology and Sustainability. Trans Tech Publications Ltd, 2025. https://doi.org/10.4028/p-96lxin.

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This paper highlights the importance of strength correction factors for a correct assessment of concrete compressive strength as a destructive test is performed. Full-scale reinforced concrete columns were prepared and the experiment consists of the extraction of cores (core diameter of 64 mm, 79 mm, and 103 mm) to carry out destructive test. The results show that the assessment of the compressive strength of concrete depends strongly on the aspect ratio and the diameter. Furthermore, the comparison between the core compressive strengths of samples with an aspect ratio of one and two could be considered as non-conventional. In addition, a likely presence of a size effect contributes to complicate the assessment of the actual compressive strength of concrete. A need of codes unification account for correction factors to interpret the equivalent compressive strength of concrete has been discussed.
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Endaya, John Emmanuel C., Rodolfo P. Mendoza Jr., and Andres Winston C. Oreta. "Experimental Study on Residual Axial Capacity of CFRP Confined Concrete Cylinder (Full and Partial Confinement) after Exposure to Elevated Temperature." In IABSE Symposium, Tokyo 2025: Environmentally Friendly Technologies and Structures: Focusing on Sustainable Approaches. International Association for Bridge and Structural Engineering (IABSE), 2025. https://doi.org/10.2749/tokyo.2025.0307.

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&lt;p&gt;This study examines the residual axial capacity of CFRP-confined concrete cylinders after exposure to elevated temperatures. Concrete cylinders were exposed to 100 °C, 160 °C, and 240 °C for 3 hours, cooled for 24 hours, and subjected to axial load testing. Key parameters analyzed include clear spacing ratio, residual strength index, and normalized strength capacity for fully and partially confined samples. Testing involved 48 cylinders, categorized by CFRP confinement spacing (0.4, 0.25, and full), temperature, and sample number. Axial force and displacement were recorded using a Universal Testing Machine, LVDTs, and a data logger, with localized failure and crack propagation observed via Digital Image Correlation. Results show reduced axial strength capacities at temperatures beyond the CFRP glass transition threshold, but CFRP confinement remains effective in enhancing compressive strength and stabilizing post-peak stress-strain behaviour.&lt;/p&gt;
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Pokorny, Jaroslav, Jan Fort, Lenka Scheinherrova, Tomas Navara, and David Javorsky. "THE ASSESSMENT OF STRENGTH PROPERTIES OF HISTORICAL MORTARS FOR SUSTAINABLE RENOVATIONS." In SGEM International Multidisciplinary Scientific GeoConference 24. STEF92 Technology, 2024. https://doi.org/10.5593/sgem2024/6.1/s26.47.

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Old buildings, in particular, those coming from the first half of 20th century often suffer with increased dampness in masonry coming from different sources. Some of them, however, have aesthetically rendered valued facades which are worth saving. For the design of new alternative mortars for renovation interventions, it is essential to obtain properties of original renders. Mechanical properties of mortars are in general assessed on standardized test samples; however, this approach cannot be always well applicable for in situ taken mortars or rendering materials. This paper is devoted to the specification of complex experimental procedure allowing to effectively obtain strength parameters of in situ collected renders which will be comparable with laboratory produced alternative mortars. Throughout this paper the detailed description of in situ collected renders sampling procedure is provided. Further, the adjusted approach of flexural strength testing in three-point arrangement and compressive strength tests for both cut renders samples and laboratory prepared alternative mortars is outlined. The suitable set up of testing procedures of materials coming from old or historical buildings introduces a key area for obtaining experimental relevant data being the bases for their sustainable renovations.
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Ikhsan Sugiarto, H., Rita Irmawaty, and Januarty Jaya Ekaputri. "Flexural Behavior of Hybrid Geopolymer Fly Ash Beams with Addition of PVA (Polyvinyl Alcohol) Fiber." In The 6th International Symposium on Infrastructure Development. Trans Tech Publications Ltd, 2025. https://doi.org/10.4028/p-g5u7of.

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Using cement as the primary material for making concrete, around 7%-15%, requires a significant amount of energy and generates abundant waste, thus significantly impacting the environmental conditions. Innovative materials are needed as alternatives to cement. Fly ash, as an environmentally friendly material, can be a solution to minimize the use of cement. The selected fiber is Poly-Vinyl Alcohol (PVA) fiber due to its high tensile strength, which can effectively inhibit the rate of crack development occurring in the beams. The research process was divided into two stages: geopolymer mortar compressive strength testing and beams flexural testing. Compressive strength testing of geopolymer mortar was conducted on 50x50x50 mm cube samples, tested at ages of 3, 7, and 28 days using both air curing and moist curing methods. Geopolymer mortar was created using fly ash as the base material, along with activators such as Sodium Hydroxide (NaOH) and Sodium Silicate (Na2SiO3). Meanwhile, flexural beams were tested in 5 samples of 150x200 mm beams with a length of 3300 mm each. The samples consisted of a control beam, a beam reinforced with commercial grouting mortar, a beam reinforced with commercial grouting mortar and PVA geopolymer fibers, a beam reinforced with geopolymer mortar, and a beam reinforced with geopolymer mortar and PVA fibers. The research results indicated that adding PVA fibers to geopolymer mortar could enhance the maximum load-bearing capacity and stiffness of the beams. Regarding failure modes, beams reinforced with PVA-free geopolymer mortar experienced delamination failure, whereas beams reinforced with PVA-containing geopolymer mortar encountered debonding failure.
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Byrne, Glenn, Roger Francis, and Geoff Warburton. "Hydrogen Induced Stress Cracking (HISC) Resistance and Improvement Methods for Super Duplex Stainless Steels." In CORROSION 2016. NACE International, 2016. https://doi.org/10.5006/c2016-06981.

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Abstract The paper reviews the history of HISC failures of duplex and superduplex stainless steels when deployed subsea and subject to cathodic protection (CP) at potentials around -1V SCE. The test methods applied to investigate the problem and subsequently used to develop current design codes that deal with HISC are reviewed. Data from these investigations is compared with other testing using the same cast and batch of bar product, but where controlled shot peening is used to induce compressive residual stresses in the surface of the test samples. Parent pipe material and cross welded samples of seamless pipes were also tested. Peened material showed a 10 to 15% improvement in the threshold stress to initiate HISC. The paper also discusses an Advanced Forging Process (AFP) production route, recently developed to provide both increased notch toughness at low design temperatures and improved resistance to HISC in forgings used to make 10k weld neck and swivel ring flanges for subsea manifolds. Data is presented showing an increase in the threshold stress ratio (applied stress divided by the actual 0.2% proof strength) from 85% to 97.5%. We also find a corresponding increase in impact toughness of AFP material, allowing use of the products at design temperatures down to minus 70°C. This is attributed to the dissolution of detrimental nitride precipitates within ferrite grains in the forgings and transforming these into advantageous intergranular reformed austenite.
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Seymour, J. B., D. J. Sweet, T. M. Emery, S. A. Murray, G. D. Feagan, and J. P. Bourgeois. "Effect of Sample Size on the Unconfined Compressive Strength of Cemented Mill Tailings." In International Geomechanics Conference. ARMA, 2024. https://doi.org/10.56952/igs-2024-0321.

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Abstract: To determine if the size of a cemented mill tailings sample affects its unconfined compressive strength (UCS), researchers with the National Institute for Occupational Safety and Health (NIOSH) conducted three series of UCS tests with cylindrical samples of cemented paste backfill (CPB), ranging in size from 0.5×1.0 inch (13×25 mm) to 6×12 inches (150×300 mm), after the samples had cured for 28, 90, and 180 days. The average strengths of the standard sized samples were comparable, indicating that 2×4-inch (50×100-mm) cylinder molds provide a reasonable alternative to larger sized cylinders. A comparison of UCS test results and sample aspect ratios (i.e., surface area divided by volume) demonstrated that the size of a CPB sample does not significantly affect its measured compressive strength until the dimensions of the test specimen are smaller than 1×2 inches (25×50 mm). The 0.5×1.0-inch (13×25-mm) samples exhibited a heightened response to strength gain or loss with curing age, which appeared to be related to the physical dimensions of the sample and its hydration rate. The development of more appropriate and consistent methods for collecting, preparing, and testing samples of cemented mill tailings will lead to more accurate quantification of mix design strengths and more effective quality control measures.
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Farhan, Syed Ahmad, Mohamed Mubarak Abdul Wahab, Nur Hazimah Shokib, et al. "Sugarcane-Bagasse-Fibre-Reinforced Concrete: Evaluation of Compressive and Splitting Tensile Strengths." In 7TH INTERNATIONAL CONFERENCE ON RECENT ADVANCES IN MATERIALS, MINERALS & ENVIRONMENT (RAMM) 2022. Trans Tech Publications Ltd, 2023. http://dx.doi.org/10.4028/p-fqet3t.

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In view of the increasing cost of raw materials and depleting natural resources in many developed countries, adoption of waste in construction materials has to be considered. Fibre-reinforced concrete (FRC) is a type of concrete that employs steel or synthetic fibres. Sugarcane bagasse fibre (SCBF), which is a waste material from the agricultural industry, can potentially be utilized in FRC as an alternative to steel or synthetic fibres. In light of the potential, in the present study, compressive and splitting tensile strengths of sugarcane-bagasse-fibre-reinforced concrete (SCB-FRC) at varying volumes of SCBF were evaluated. Four types of concrete samples were prepared, which are the control sample that does not contain any SCBF and SCB-FRC samples that contain 0.5, 1.0, and 1.5% of SCBF of 5-cm fibre lengths by volume of cement. Samples were cured in water for 7 and 28 days for compressive strength testing and 28 days for splitting tensile testing. Findings indicate that the optimum fibre volume is 1.0%, where the highest compressive strengths of 24.75 and 33.02 MPa were achieved at 7 and 28 days of curing, respectively, and the highest splitting tensile strength of 2.61 MPa was achieved. Formation of fibre bundles during mixing may have resulted in the decrease in strength as the fibre volume was further increased from 1.0 to 1.5%.
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Gebauer, Daniel, Steffen Marx, and Gregor Schacht. "Testing Existing Structures – Compressive Strength and Tensile Split- ting Strength of the Lahntal Bridge Limburg." In IABSE Symposium, Guimarães 2019: Towards a Resilient Built Environment Risk and Asset Management. International Association for Bridge and Structural Engineering (IABSE), 2019. http://dx.doi.org/10.2749/guimaraes.2019.1619.

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&lt;p&gt;In 2016, the Lahntal Bridge near Limburg was replaced by a new structure. The existing bridge was deconstructed on a formwork carriage. Before the deconstruction, more than 250 concrete cores and other specimens were taken from the existing structure. The samples are located all over the cross section and the length of the bridge. These specimens are examined for their material prop- erties.&lt;/p&gt;&lt;p&gt;The investigations include the experimental determination of the compressive strength, the tensile splitting strength, the creep behaviour, the chloride ingress, fatigue tests and the anchoring behav- iour of the tendons. This paper deals with the compressive strength and the tensile splitting strength.&lt;/p&gt;&lt;p&gt;The results of these tests are statistically evaluated by determining the mean value, the standard deviation and the coefficient of variation. In addition, it is examined whether there are any correla- tions between various material properties. The results are also compared to the normative expec- tations of Eurocode 2.&lt;/p&gt;
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Racek, Miroslav, Pavlina Mateckova, and Oldrich Sucharda. "Experimental Investigation of Reinforced High-Strength Concrete Beam." In Non-Traditional Cement and Concrete 2023 conference. Trans Tech Publications Ltd, 2024. http://dx.doi.org/10.4028/p-kqa4sp.

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Building industry is an important player that consumes a significant part of raw materials and energy. With regard to construction industry sustainable development and design requirements there is a space for innovative solutions, where one of the possibility include the use of high-strength concrete. The paper deals with the substantial description and detailed evaluation of the testing of reinforced high strength concrete beam which was exposed to three point loading test. Large scale experiment was complemented with material diagnosis of selected mechanical properties using destructive and non-destructive methods. Non-destructive methods were used to verify compressive strength and dynamic modulus of elasticity. Destructive compressive strength testing was applied on cylinder samples prepared with core drilling and determined values were compared with non- destructive testing. Measured data will be used for future advanced non-linear modelling.
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ABDULKAREEM, M. O. "Evaluation of compressive strength of bio-fibrous concrete with silica fume." In Advances in Cement and Concrete. Materials Research Forum LLC, 2025. https://doi.org/10.21741/9781644903537-3.

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Abstract. Concrete is a widely used material in construction due to its advantageous properties. However, the formation of cracks in concrete presents a significant challenge to its durability and can lead to a decrease in the service life of structures. Researchers have proposed various solutions to address this issue, including the incorporation of bacteria for self-healing and the use of kenaf fibre, and silica fume in concrete. In this study, bacillus subtilis bacteria is utilized to investigate their compressive strength on concrete, while kenaf Fiber and silica fume were added to concrete mixes at different concentrations of 0%, 0.1%, 0.2%, 0.5% and 0%, 1%, and 1%, 2%, 5% and 10%, respectively, to assess its effects on concrete strength. Concrete samples were cast in cube moulds with water-cement ratios of 0.5 and compressive strength testing was conducted on the 28th day to determine the samples' impact resistance. The inclusion of bacillus subtilis in the concrete mix increased the compressive strength of concrete by 6.7%. Furthermore, incorporation of kenaf Fiber and silica fume increases the compressive strength of bio-concrete by about 55%.
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Reports on the topic "Testing samples for compressive strength"

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Shivakumar, Pranavkumar, Kanika Gupta, Antonio Bobet, Boonam Shin, and Peter J. Becker. Estimating Strength from Stiffness for Chemically Treated Soils. Purdue University, 2022. http://dx.doi.org/10.5703/1288284317383.

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The central theme of this study is to identify strength-stiffness correlations for chemically treated subgrade soils in Indiana. This was done by conducting Unconfined Compression (UC) Tests and Resilient Modulus Tests for soils collected at three different sites—US-31, SR-37, and I-65. At each site, soil samples were obtained from 11 locations at 30 ft spacing. The soils were treated in the laboratory with cement, using the same proportions used for construction, and cured for 7 and 28 days before testing. Results from the UC tests were compared with the resilient modulus results that were available. No direct correlation was found between resilient modulus and UCS parameters for the soils investigated in this study. A brief statistical analysis of the results was conducted, and a simple linear regression model involving the soil characteristics (plasticity index, optimum moisture content and maximum dry density) along with UCS and resilient modulus parameters was proposed.
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Lagergren, Eric S. Effects of testing variables on the measured compressive strength of high-strength (90 MPa) concrete. National Institute of Standards and Technology, 1994. http://dx.doi.org/10.6028/nist.ir.5405.

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McConnell, J. W. Jr, and R. M. Jr Neilson. The effects of aging on compressive strength of low-level radioactive waste form samples. Office of Scientific and Technical Information (OSTI), 1996. http://dx.doi.org/10.2172/251291.

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Snyder, Kenneth A., James R. Clifton, and Nicholas J. Carino. Nondestructive evaluation of the in-place compressive strength of concrete based upon limited destructive testing. National Institute of Standards and Technology, 1992. http://dx.doi.org/10.6028/nist.ir.4874.

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Asvapathanagul, Pitiporn, Simone Galano, Andrea Calabrese, et al. Experimental Investigation of the Self-Healing Potential of Bacteria for Sustainable Concrete Structures. Mineta Transportation Institute, 2023. http://dx.doi.org/10.31979/mti.2023.2239.

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Although concrete is the most widely used building material in the world, its limited tensile strength makes cracking a common phenomenon in concrete elements. This study investigates the potential of autonomous self-healing as an eco-friendly and lowcost method to increase the durability of concrete. The crack-healing potential of different types of high-alkaline-tolerant bacteria or calcite-precipitation microorganisms is investigated. High-alkaline-tolerant bacteria and calcite-precipitation microorganisms were used to retrofit lab-fractured concrete samples. The samples healed with each of these bacteria groups were cast and tested under compressive load up to failure to measure the compressive strength of the concrete samples. The outcomes of experimental tests on concrete samples healed with biological processes demonstrate how this technique can be implemented when retrofitting durability-enhanced, eco-friendly concrete structures to improve the strength of durability of the material and ultimately improve the durability of many forms of concrete infrastructure.
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Ucak-Astarlioglu, Mine, Jedadiah Burroughs, Charles Weiss, et al. Graphene in cementitious materials. Engineer Research and Development Center (U.S.), 2023. http://dx.doi.org/10.21079/11681/48033.

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This project aims to determine the influence of laboratory-generated graphene (LGG) and commercial-grade graphene (CGG) on the chemical structure and compressive strength of graphene-cement mixtures. Determining the graphene-cement structure/processing/property relationships provides the most useful information for attaining the highest compressive strength. Graphene dose and particle size, speed of mixing, and dispersant agent were found to have important roles in graphene dispersion by affecting the adhesion forces between calcium silicate hydrate (CSH) gels and graphene surfaces that result in the enhanced strength of cement-graphene mixtures. X-ray diffraction (XRD), Raman, and scanning electron microscope (SEM) analyses were used to determine chemical microstructure, and compression testing for mechanical properties characterization, respectively. Based on observed results both LGG and CGG graphene cement mixtures showed an increase in the compressive strength over 7-, 14-, and 28-day age curing periods. Preliminary dispersion studies were performed to determine the most effective surfactant for graphene dispersion. Future studies will continue to research graphene—cement mortar and graphene—concrete composites using the most feasible graphene materials. These studies will prove invaluable for military programs, warfighter support, climate change, and civil works.
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Calabrese, Andrea, Pitiporn Asvapathanagul, Nisarg N. Patel, et al. Experimental Investigation of the Self-Healing Potential of Bacteria for Sustainable Concrete Structures Phase 2. Mineta Transportation Institute, 2024. http://dx.doi.org/10.31979/mti.2024.2331.

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Concrete is a critical component of so much of the modern construction industry. This material, well known for its versatility, robustness, longevity, and strength, is well-suited for a wide range of structural applications. Nonetheless, the widespread occurrence of cracks in concrete structures, primarily attributed to its limited tensile strength, shrinkage, and overstain, imposes a considerable economic and environmental challenge when it comes to retrofitting these fissures. This study tackles this problem by harnessing bacteria tolerant to high alkaline conditions to enable Microbially Induced Calcium Carbonate Precipitation (MICP) for the self-repair of concrete. This is achieved through an external application method, wherein bacteria are manually and externally applied to the cracks of the concrete surface. This report presents the results of testing three different bacterial species (Bacillus subtilis, Bacillus megaterium, and Sporosarcina pasteurii) to retrofit laboratory-manufactured cracks. The self-repaired groups underwent compressive load-to-failure testing and were compared to a control group (With Crack), revealing a notable increase in compressive strength ranging from 8.59% to 21.61%. The outcomes of the compressive strength tests illustrate the viability of implementing this technique for retrofitting concrete structures, showcasing its environmentally friendly nature and its ability to significantly enhance structural durability. This, in turn, has the potential to impact existing and future developments that incorporate concrete.
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8

Thompson, Marshall. Thickness Design for Cement-Treated Base Pavements. Illinois Center for Transportation, 2024. http://dx.doi.org/10.36501/0197-9191/24-015.

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This project developed a cement-treated base (CTB) thickness design procedure for the Illinois Department of Transportation based on CTB fatigue (stress ratio criterion). The researcher developed a comprehensive ILLI-PAVE database for a range of thickness design inputs (7-day compressive strength, CTB thickness, and subgrade modulus). A CTB flexural stress algorithm was derived from the comprehensive ILLI-PAVE database. Minimum CTB thicknesses for IDOT Class III and Class IV pavements were established, and the results were presented in tabular form. Falling weight deflectometer testing and project site reviews of several existing typical CTB projects indicated CTB compressive strengths are significant (average of 750 psi), and the projects are performing well. As expected, transverse shrinkage cracks have occurred in the projects.
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9

Scott, Dylan, Bradford Songer, Trevor Looney, et al. Accelerated concrete flexural strengths for airfield pavements. Engineer Research and Development Center (U.S.), 2024. http://dx.doi.org/10.21079/11681/49413.

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Mixture-proportioning studies and submittals are an integral part of the pavement design and planning process as outlined in the Unified Facilities Guide Specification 32 13 14.13 for Department of Defense airfield pavements. Many aspects of the required testing are time-consuming due to the duration of the test (e.g., alkali–silica reaction experiments) or to the required concrete age at testing (e.g., compressive or flexural strength testing). Time awaiting testing results often delays projects and adds cost. The objective was to develop an accelerated testing requirement for flexural strength (currently 650 psi or greater at 90 days), thereby reducing the time to pavement acceptance. Potential accelerated testing methodologies were evaluated in a literature review. A statistical analysis generated under a design of experiments protocol determined concrete flexural strength gain and correlation ratios. Results of the statistical analysis showed that a reduced flexural strength of 600 psi could be accepted at 14 days and still reach the minimum flexural strength requirement of 650 psi at 90 days with high certainty (i.e., greater than 95% certainty). Additionally, the results stemming from the design of experiments compared favorably with data gathered from four mixture-proportioning submittals acquired via the Transportation Systems Center.
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Whisler, Daniel, Rafael Gomez Consarnau, and Ryan Coy. Novel Eco-Friendly, Recycled Composites for Improved CA Road Surfaces. Mineta Transportation Institute, 2021. http://dx.doi.org/10.31979/mti.2021.2046.

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The continued use of structural plastics in consumer products, industry, and transportation represents a potential source for durable, long lasting, and recyclable roadways. Costs to dispose of reinforced plastics can be similar to procuring new asphalt with mechanical performance exceeding that of the traditional road surface. This project examines improved material development times by leveraging advanced computational material models based on validated experimental data. By testing traditional asphalt and select carbon and glass reinforced composites, both new and recycled, it is possible to develop a finite element simulation that can predict the material characteristics under a number of loads virtually, and with less lead time compared to experimental testing. From the tested specimens, composites show minimal strength degradation when recycled and used within the asphalt design envelopes considered, with an average of 49% less wear, two orders of magnitude higher compressive strength, and three orders for tensile strength. Predictive computational analysis using the validated material models developed for this investigation confirms the long-term durability.
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