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Artigos de revistas sobre o tema "Concrete"

Autor: Grafiati

Publicado: 4 de junho de 2021

Última modificação: 25 de julho de 2025

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1

Sahnoun, Ilhem, Zhour Guemmadi, and Belkacem Toumi. "RELATIONSHIPS BETWEEN MECHANICAL PROPERTIES (COMPRESSIVE STRENGTH) AND PHYSICAL PROPERTIES (POROSITY) AT HIGH TEMPERATURES." Architecture and Engineering 10, no. 2 (2025): 78–87. https://doi.org/10.23968/2500-0055-2025-10-2-78-87.

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Introduction: This research is a part of a broader study on the evolution of concrete properties when exposed to high temperatures. It aims to analyze the behavior of ordinary concretes at elevated temperatures, incorporating either organic or synthetic fibers in the same dosage. Metods: Three concrete compositions were formulated: plain concrete without fibers (CO1), polypropylene fiber-reinforced concrete (CFP), and chicken feather fiber-reinforced concrete (CFC1), with both fiber-reinforced types containing an identical fiber dosage of 0.9 %. The prepared specimens were subjected to a heati

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Bergmann, Ana Claudia, Gustavo Savaris, Carlos Eduardo Tino Balestra, and Lucia Bressiani. "CONCRETOS AUTOADENSÁVEIS E CONVENCIONAIS: ANÁLISE DAS PROPRIEDADES EM ESTADO FRESCO E ENDURECIDO." REEC - Revista Eletrônica de Engenharia Civil 15, no. 2 (2020): 167–78. http://dx.doi.org/10.5216/reec.v15i2.50695.

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RESUMO: Os concretos autoadensáveis destacam-se por suas características essenciais: capacidade de preenchimento de fôrmas, habilidade passante e resistência à segregação, permitindo assim o aumento da qualidade de peças estruturais de concreto, assim como a otimização de sua execução. Contudo, para obtenção de suas características essenciais, um fator é imprescindível trata da utilização de materiais finos, com o objetivo de controlar os efeitos negativos de segregação e exsudação à que o concreto fresco é suscetível a apresentar. Neste contexto, o presente trabalho tem por objetivo comparar

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Žiogas, Vigantas Antanas, Svajūnas Juočiūnas, and Giedrius Žiogas. "HYDROTECHNICAL CONCRETE WITH LOCAL AGGREGATES AND THEM USING FOR MONOLITHIC STRUCTURES." Engineering Structures and Technologies 1, no. 2 (2009): 102–10. http://dx.doi.org/10.3846/skt.2009.13.

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The article discusses the technological peculiarities of construction monolithic hydrotechnical concrete structures, use of local aggregates for producing special concretes, methods of determining water impermeability of concretes as well as the evaluation of the methods mentioned above. The article presents the requirements for the granulometric composition of aggregate mixes for the production of flowing concrete mixes used for the construction of monolithic hydrotechnical structures. The possibilities and expediency of using local crushed gravel with increased amounts of weak particles for

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Beppaev, Zamir U., Lydia H. Astvatsaturova, Sergei A. Kolodyazhny, Sergey A. Vernigora, and Vladislav V. Lopatinsky. "Durability characteristics of concrete and reinforced concrete with recycling (concrete) rubble." Concrete and Reinforced Concrete 625, no. 6 (2024): 27–39. https://doi.org/10.37538/0005-9889-2024-6(625)-27-39.

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Introduction. One of the most important reserves for saving material and energy resources in the construction industry is the re-involvement of recycled (concrete) crushed stone in the production sector, in particular for the production of heavy concrete of classes B7,5–B35 for general construction purposes. Solving this problem will practically ensure the implementation of the most important principle of waste-free technological processes (in the production of precast and monolithic concrete and reinforced concrete structures) and create conditions for fulfilling important social, economic an

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Meesaraganda, Lakshmi Vara Prasad, Endow Ayar Mazumder, and L. Ramaprasad Reddy. "Durability Studies of Conventional Cement Concrete and Geopolymer Concrete." Materials Science Forum 1116 (March 5, 2024): 97–103. http://dx.doi.org/10.4028/p-o39dkm.

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The service life of structural members is significantly impacted by the durability of the concrete and that they are made of. The embedded reinforcing steel in durable concrete is protected from corrosion, and the possibility of concrete spalling in the concrete as a result of chemical attack is reduced. This study investigates the effectiveness of geopolymer concretes prepared using fly ash or a mixture of fly ash and slag (SLG). The performance of OPC concrete is likewise evaluated for comparing the durability of geopolymer concretes. This is done in order to compare the two types of concret

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Stehlík, Michal. "TESTING THE STRENGTH OF CONCRETE MADE FROM RAW AND DISPERSION-TREATED CONCRETE RECYCLATE BY ADDITION OF ADDITIVES AND ADMIXTURES." Journal of Civil Engineering and Management 19, no. 1 (2013): 107–12. http://dx.doi.org/10.3846/13923730.2012.734853.

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Today, concrete comprises more than 65% of the total volume of building constructions. As it undergoes degradation and buildings require refurbishment, the volume of concrete increases at disposal sites. Due to a lack of non-renewable resources and due to high prices of energies, the reuse of concrete seems to be more than desirable. It is common knowledge that in concretes made from recycled concrete, the strengths of the original concretes can hardly be achieved. The addition of dispersion additives and mineral admixtures into the freshly mixed concrete can contribute to improving the mechan

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Pani, Luisa, Lorena Francesconi, James Rombi, Fausto Mistretta, Mauro Sassu, and Flavio Stochino. "Effect of Parent Concrete on the Performance of Recycled Aggregate Concrete." Sustainability 12, no. 22 (2020): 9399. http://dx.doi.org/10.3390/su12229399.

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Recycling concrete construction waste is a promising way towards sustainable construction. Indeed, replacing natural aggregates with recycled aggregates obtained from concrete waste lowers the environmental impact of concrete constructions and improves natural resource conservation. This paper reports on an experimental study on mechanical and durability properties of concretes casted with recycled aggregates obtained from two different parent concretes, belonging to two structural elements of the old Cagliari stadium. The effects of parent concretes on coarse recycled aggregates and on new st

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8

Wang, Chong, Chang Hui Yang, Chao Jun Wan, and Yan Feng Tian. "Comparison of Fluidity between Metakaolin and Silica Fume Concretes." Key Engineering Materials 477 (April 2011): 95–101. http://dx.doi.org/10.4028/www.scientific.net/kem.477.95.

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Aiming at preparing the high performance concrete with metakaolin (MK) replacing silica fume (SF), comparison of fluidity between MK concrete and SF concrete was investigated in this paper. Slump, spread, and slump loss with time of fresh concrete under the condition of superplasticizer adding were tested, which containing with 5 to 15 wt. % replacement of MK, SF, combination of MK and ground granulated blastfurnace slag (GGBS), or combination of SF and GGBS, respectively. The mechanism for exploring fluidity difference of MK concrete and SF concrete were researched by measuring ζ potential an

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9

Dobshits, Lev M. "Physical and mathematical modeling of frost resistance for cement concretes." Structural Mechanics of Engineering Constructions and Buildings 19, no. 3 (2023): 313–21. http://dx.doi.org/10.22363/1815-5235-2023-19-3-313-321.

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The key factor of engineering structures made of concrete and reinforced concrete is insufficient frost resistance of concretes. It is important to identify the causes and prevent concrete damage caused by frost. The research provides the basic points of the developed physical and mathematical theory of cement concretes frost resistance. Under consideration are the processes occurring during cyclic freezing and thawing of concrete in a water-saturated state. The results of the performed theoretical and experimental studies are presented. The criterion of concrete frost resistance, which estima

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10

Kaitukov, Batraz, Mihail Stepanov, and Pavel Kapyrin. "The choice of concrete mixers for the concrete preparation." MATEC Web of Conferences 178 (2018): 06016. http://dx.doi.org/10.1051/matecconf/201817806016.

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The production of commodity concretes is a large segment of the construction industry and a testing base for concrete mixers. The choice of high-reliable concrete mixers for high-quality production of various brands of concrete is topical. When choosing concrete mixers, the most important is condition for improving the quality of mixing. Solving this problem, the analysis of various parameters and structural designs of concrete mixers is carried out. Dependencies are established that show the properties of concrete of various brands with their composition and technical characteristics of concr

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11

Santor, M. S., A. L. G. Gastaldini, C. Crauss, G. T. Dos Santos, and F. C. Rossini. "Influência de materiais de proteção na resistividade elétrica do concreto." Revista ALCONPAT 2, no. 1 (2012): 46–56. http://dx.doi.org/10.21041/ra.v2i1.26.

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RESUMOA durabilidade das estruturas de concreto armado é resultado da ação protetora do concreto sobre a armadura. Quando a passivação do aço deixa de existir a estrutura torna-se vulnerável ao fenômeno da corrosão, cuja propagação, após iniciada é essencialmente controlada pela resistividade elétrica do concreto. O objetivo deste trabalho foi avaliar a alteração na resistividade elétrica de concretos produzidos com diferentes tipos de cimento, CP II F, CP IV e CP V, submetidos a tratamento superficial com produto obturador dos poros e argamassa polimérica. Para efeito de análise os resultados

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Flohr, Alexander, and Andrea Osburg. "Design and Development of Concretes for Special Rehabilitation Tasks." MATEC Web of Conferences 199 (2018): 07001. http://dx.doi.org/10.1051/matecconf/201819907001.

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The requirements for concrete restoration are not only aspects of retrofitting or restoration of bearing capacity but also aspects of preservation of historic structures, such as industrial monuments or civil engineering structures and buildings of the 1960s [1]. Thereby the facsimile replication of the concrete surface is a particular challenge. For the manufacture of delicate and complex structures with restricted accessibility self-compacting concrete (SCC) is well suited [2]. A modification with polymers normally ensures the durability of repair mortars or concretes (PCC) [3]. The combinat

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13

Biel, Timothy D., and Hosin Lee. "Magnesium Oxychloride Cement Concrete with Recycled Tire Rubber." Transportation Research Record: Journal of the Transportation Research Board 1561, no. 1 (1996): 6–12. http://dx.doi.org/10.1177/0361198196156100102.

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Either portland cement or magnesium oxychloride cement was used as binders for concretes that incorporated fine rubber aggregate, ranging from 0 to 25 percent by volume. The concretes were tested for their compressive and split tensile strengths to determine whether the use of a magnesium oxychloride cement along with recycled tire rubbers would improve concrete properties. Failure of the concrete around the rubber particles was attributed to tension failure, leading to weak shear failure of the concrete matrix. Both portland and magnesium oxychloride cement concretes lost 90 percent of their

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14

Sanal, Irem. "A Review on Reduced Environmental Impacts of Alternative Green Concrete Productions." International Journal of Public and Private Perspectives on Healthcare, Culture, and the Environment 1, no. 2 (2017): 55–68. http://dx.doi.org/10.4018/ijppphce.2017070104.

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Concrete is being recognized for its environmental benefits in support of sustainable development. In response to growing environmental and economic forces, regulatories, engineers and owners are seeking efficient concrete solutions that conserve non-renewable resources. Global demands for regulating concrete waste arise from the growth of these environmental and economic issues. Thus, the concept of “green concrete” as an eco-friendly alternative to conventional concrete has been emerging. This publication seeks to demonstrate how concrete contributes to future generations' sustainable develo

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Müller, Harald S., and Michael Haist. "Design approaches for sustainable concrete mixes and structural components." Revista Ingeniería de Construcción 39 (2024): 1–10. https://doi.org/10.7764/ric.00125.21.

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Changes in the current use of concrete materials and design approaches are mandatory in order to comply with the requirements imposed on future sustainable concrete structures. Before this background the article indicates the design of sustainable concrete mixes (green concretes or eco-concretes) and the structural components made from them. Such concretes are characterized by a pronouncedly reduced CO2 footprint compared to conventional structural concretes made purely with Ordinary Portland Cement (OPC). After an introduction to the sustainability problems of today's structural concretes, th

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16

Marczewska, Julia, and Wojciech Piasta. "The impact of air content on the durability of concrete under combined sulphate and freezethaw attack." MATEC Web of Conferences 163 (2018): 05002. http://dx.doi.org/10.1051/matecconf/201816305002.

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The aim of the study was to determine the optimal air content in concretes subjected a combination of exposure conditions. Five series of concretes with different air contents were tested. The article reports the experimental results of the combined sulphate expansion and freeze-thaw attack in ordinary Portland cement concrete. Some of the concrete samples were immersed in a 5% sodium sulphate solution for nine months, and then frozen in air and thawed in water. The resistance of concrete to plain freezing and thawing was also tested. In order to compare the degree of concrete damage in both e

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17

Ahmad, Siti Hamizah, Noor Dina Md Amin, Noorwirdawati Ali, et al. "The Effects of Domestic Plastic Waste on Concrete Properties: Sustainable Replacement of Aggregates." Journal of Advanced Research in Applied Mechanics 132, no. 1 (2025): 185–94. https://doi.org/10.37934/aram.132.1.185194.

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Plastic waste poses a major environmental challenge in Southeast Asia, with Malaysia as the largest contributor. Recycling offers a solution by incorporating plastic waste as a substitute material in concrete production. This approach addresses environmental concerns while promoting sustainable construction practices. This study investigates the optimal ratios of cement, water, plastic replacement, and aggregate in concrete compositions. Furthermore, it examines the influence of domestically sourced waste plastic on concrete properties. A comparative analysis is conducted between concretes wit

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18

Noor Azline, M. N., Farah Nora Aznieta Abd Aziz, and Arafa Suleiman Juma. "Effect of Ground Granulated Blast Furnace Slag on Compressive Strength of POFA Blended Concrete." Applied Mechanics and Materials 802 (October 2015): 142–48. http://dx.doi.org/10.4028/www.scientific.net/amm.802.142.

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The article reports a laboratory experimental programme that investigated effect of ground granulated blast furnace (GGBS) on compressive strength of POFA ternary concrete. Compressive strength tests were performed at a range of cements combinations, including 100%PC, two POFA levels for binary concrete, 35% and 45%, and 15%GGBS inclusion for POFA ternary concrete. The compressive strength results were examined in comparison to PC only and equivalent POFA binary concretes for up to 28 days. Results show that the reduction in compressive strength is greater with the higher cement replacement le

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19

Li, Zhu Guo. "Development and Application of Eco-Friendly Concrete." Advanced Materials Research 250-253 (May 2011): 3827–36. http://dx.doi.org/10.4028/www.scientific.net/amr.250-253.3827.

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Concrete is the most popular construction material. In its lifetime, natural resources such as limestone and aggregate are consumed. Meanwhile, emission of air pollutants and discharge of waste concrete in large quantities are of great concern. However, in recent years, high performance concrete and new types of concretes have been developed to decrease the environmental burden in its lifespan or in production phase, to utilize a substantial amount of recycled industrial waste, and to improve local environment. These eco-friendly concretes are classified into environmental protection type such

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20

Grinys, Audrius, Danutė Vaičiukynienė, Algirdas Augonis, Henrikas Sivilevičius, and Rėda Bistrickait. "EFFECT OF MILLED ELECTRICAL CABLE WASTE ON MECHANICAL PROPERTIES OF CONCRETE." Journal of Civil Engineering and Management 21, no. 3 (2015): 300–307. http://dx.doi.org/10.3846/13923730.2015.1005019.

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The article focuses on investigation of mechanical and fracture properties of concrete containing electrical cable waste as well as some microstructural features of such concrete. Added to concrete, electrical cable waste reduces the overall concrete bulk density. Compressive, flexural, tensile splitting strengths and elastic modulus decreased when electrical cable waste was admixed to conventional and polymer modified concretes. The best mechanical properties of concrete samples containing electrical cable waste were identified in polymer modified concrete containing 5% of electrical cable wa

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Balabanov, Vadim, Victor Baryshok, and Nikita Epishkin. "Concrete based on sulfur binder being modified with inorganic additives." MATEC Web of Conferences 212 (2018): 01013. http://dx.doi.org/10.1051/matecconf/201821201013.

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The sharply continental climate of the Irkutsk region is characterized by wide temperature intervals throughout the year. The repeated cyclicity of freezing and thawing of building materials in the water-saturated state influences the change in technical characteristics and the durability of concrete products and structures. The concrete products’ features in such climatic conditions create the need for the production of concretes with improved indicators of physical and mechanical properties. The effect of modifying additives on the technological characteristics of sulfur concrete is establis

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Ziane, Sami, Mohammed-Rissel Khelifa, and Samy Mezhoud. "A Study of the Durability of Concrete Reinforced with Hemp Fibers Exposed to External Sulfatic Attack." Civil and Environmental Engineering Reports 30, no. 2 (2020): 158–84. http://dx.doi.org/10.2478/ceer-2020-0025.

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AbstractThe purpose of this paper is to study the durability of concrete reinforced with hemp fibers in the face of external Sulfatic attack. For this purpose, five types of concrete were formulated; three types of concrete reinforced with hemp fibers (HC-0.25, HC-0.5, and HC-1) at 0.25%, 0.5%, and 1 % of hemp fibers in volume, respectively. And two control concretes, being ordinary concrete (OC) and polypropylene fiber reinforced concrete (PC). To assess the sulfatic attacks, the described concrete types underwent two aging protocols: 1) a complete immersion in 12.5 % Sodium Sulfate (Na2SO4)

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Mailyan, Levon R., Sergey A. Stel’makh, Evgenii M. Shcherban’, et al. "Investigation of Integral and Differential Characteristics of Variatropic Structure Heavy Concretes by Ultrasonic Methods." Applied Sciences 11, no. 8 (2021): 3591. http://dx.doi.org/10.3390/app11083591.

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The article develops methods and methodology for experimental studies of centrifuged and vibro-centrifuged concrete products of annular cross-section. They assess the real variatropy of the structure and confirm the correctness of the accepted research. An original technique for experimental studies of the variatropy of the cross-sections of vibrated, centrifuged and vibro-centrifuged concretes is proposed to determine their integral (common) and differential (differing in layers) strength and strain characteristics and deformation diagrams. It has been proved that with vibro-centrifugation it

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Ekolu, Stephen O., Zaid Mohamed, and Sean Kay. "Experimental Investigation and Yield Line Prediction for Ultimate Capacity of Recycled Aggregate Concrete Slabs." International Journal of Engineering Research in Africa 47 (March 2020): 31–44. http://dx.doi.org/10.4028/www.scientific.net/jera.47.31.

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The present investigation was conducted to evaluate the influence of recycled aggregates on structural behaviour of reinforced concrete (RC) slabs. Concrete mixtures of 0.6 and 0.4 water/cement ratios were used to produce normal strength concretes and high strength concretes, respectively. Various concrete mixtures were prepared by replacing 19 mm natural coarse aggregates with 0, 25, 50, 100% recycled coarse aggregate (RCA) then used to cast RC slabs of size 500 x 300 x 100 mm thick, and 100 mm cubes. The two-way concrete slabs were reinforced orthotropically with Y12 steel bars. Workability,

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Liu, Rui Cui, Fu Yi Jiang, and Zi Quan Liu. "Research and Development Progress on Concrete Preparation with Seawater." Advanced Materials Research 450-451 (January 2012): 34–37. http://dx.doi.org/10.4028/www.scientific.net/amr.450-451.34.

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This document outlined the development of concrete mixing water at first. And then it discussed some properties of concrete prepared with adding sea water and impacts of sea water on effectiveness of concrete. The article also tried to explain some reasons of these impacts. The author emphasized on analyzing the effect to the function of concrete by using seawater as mixing water and the reasons and separately elaborated on the different effects to plain concretes and reinforced concretes. At last, the article predicted the development trend of using seawater as concrete mixing water.

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Ristic, Nenad, Dusan Grdic, Jelena Bijeljic, Zoran Grdic, and Gordana Toplicic-Curcic. "Properties of steel-polypropilene hybrid fibers reinforced concrete." Facta universitatis - series: Architecture and Civil Engineering 19, no. 3 (2021): 235–44. http://dx.doi.org/10.2298/fuace211202018r.

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This paper present the results of mechanical properties of hybrid reinforced concrete made by adding polypropylene and steel fibers into concrete mixture. For the testing purposes were used steel fibers with hooked ends and monofilament polypropylene fibers. The total of 5 batches of concrete were made: concrete with addition of steel fibers, polypropylene fibers and their combination in amount of 0,5 % of the concrete volume. The test results show that concretes made by adding of 0.4% steel and 0.1% polypropylene fibers have better performance compared to other concretes.

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Yee, Jia Jun, Sheh Ching Khong, JiaLing Che, Kong Fah Tee, and Siew Choo Chin. "Sustainable Materials in Concrete Railway Sleepers: A Review of Current Developments and Future Prospects." Journal of Chemical Engineering and Industrial Biotechnology 10, no. 1 (2024): 1–16. http://dx.doi.org/10.15282/jceib.v10i1.10292.

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Concretes have been the favoured material to make concrete railway sleepers due to better accessibility and weather compared to their timber counterparts. Railway sleepers are crucial infrastructure and 5% of concrete sleepers fail prematurely. Sleeper failure could result in catastrophic railway accidents. Hence, improvement is needed in the concrete sleeper mixes. Previous literature has identified two methods of improving concrete strength in concrete mixes with wastes, through replacement of concrete constituents or the use of alkali-activated materials. Use of wastes as partial concrete m

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Hoffmann Sampaio, Carlos, Bogdan G. Cazacliu, Weslei Monteiro Ambrós, et al. "Demolished concretes recycling by the use of pneumatic jigs." Waste Management & Research: The Journal for a Sustainable Circular Economy 38, no. 4 (2020): 392–99. http://dx.doi.org/10.1177/0734242x20902835.

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Large quantities of construction and demolition waste is generated annually around the world. Part of this material is processed in recycling plants. After removing metals, fines and lights, the construction and demolition waste is crushed and sized and can be used as aggregates for low resistance concrete, for road sub-base, city landfill and other low value-added applications. For their use as coarse aggregate in structural concretes, construction and demolition waste must exhibit high densities and regularity of the material. This material usually is presented in demolished concretes. About

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Feng, Xiao Xin, Xue Li Xi, Ji Wei Cai, Hong Jun Chai, and Yu Zeng Song. "Investigation of Drying Shrinkage of Concrete Prepared with Iron Mine Tailings." Key Engineering Materials 477 (April 2011): 37–41. http://dx.doi.org/10.4028/www.scientific.net/kem.477.37.

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Concretes of C30 and C60 were prepared with iron mine tailings as fine aggregate and coarse aggregate and with natural sand and common crushed stone separately. The drying shrinkage of concretes cured under the natural condition in the laboratory was tested. The results showed that whether C30 or C60 the drying shrinkage of concrete prepared with iron mine tailings was a little smaller than that of concrete with natural sand and common crushed stone. It was also found that whether the concrete with iron mine tailings or the concrete with natural sand and common crushed stone the drying shrinka

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Jin, Hu. "Late-Age Properties of Concrete with Different Binders Cured under 45°C at Early Ages." Advances in Materials Science and Engineering 2017 (2017): 1–13. http://dx.doi.org/10.1155/2017/8425718.

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It is commonly accepted that high curing temperature (near 60°C or above) results in reduced mechanical properties and durability of concrete compared to normal curing temperature. The internal temperature of concrete structures at early ages is not so high as 60°C in many circumstances. In this paper, concretes were cured at 45°C at early ages and their late-age properties were studied. The concrete cured at 20°C was employed as the reference sample. Four different concretes were used: plain cement concrete, concrete containing fly ash, concrete containing ground granulate blast furnace slag

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Tolmachov, Sergii, Olena Belichenko, and Sergii Pronin. "INCREASING FROST RESISTANCE OF ROAD CONCRETE BY APPLYING SECONDARY PROTECTION." Avtoshliakhovyk Ukrayiny 3, no. 271 (2022): 32–36. http://dx.doi.org/10.33868/0365-8392-2022-3-271-32-36.

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The production of road cement-concrete mixtures, their transportation, laying and compaction usually occurs during periods of high positive temperatures and the presence of wind. When cement concretes harden under such conditions, moisture evaporates from them. This can lead to air shrinkage, which causes to the cracking and collapse of concrete. Therefore, to protect the hardening cement concrete from shrinkage and cracking, film-forming materials are applied to its surface. However, the practice of using road surfaces shows that such protection is not sufficient to ensure the durability of c

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Liu, Guanzhi, Nikola Tošić, and Albert de la Fuente. "Recycling of Macro-Synthetic Fiber-Reinforced Concrete and Properties of New Concretes with Recycled Aggregate and Recovered Fibers." Applied Sciences 13, no. 4 (2023): 2029. http://dx.doi.org/10.3390/app13042029.

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The study aims to investigate the feasibility of using recycled aggregate (RA) and recovered fibers (RFs) obtained from recycling polypropylene fiber-reinforced concrete (PPFRC) in new concrete production. The mechanical properties were compared between a parent PPFRC, polypropylene fiber-reinforced recycled aggregate concrete (PPRAC), and recovered polypropylene fiber concrete (Re-PPRFC). All concretes were designed to have the same compressive strength and slump. The parent concrete was produced with 3 and 9 kg/m3 of polypropylene fibers. After recycling, the RA and RF were collected, and ne

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Shaikh, Faiz. "Mechanical and Durability Properties of Green Star Concretes." Buildings 8, no. 8 (2018): 111. http://dx.doi.org/10.3390/buildings8080111.

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This paper presents mechanical and durability properties of green star concretes. Four series of concretes are considered. The first series is control concrete containing 100% ordinary Portland cement, 100% natural aggregates and fresh water. The other three series of concretes are green star concretes according to Green Building Council Australia (GBCA), which contain blast furnace slag, recycled coarse aggregates and concrete wash water. In all above concretes compressive strength, indirect tensile strength, elastic modulus, water absorption, sorptivity and chloride permeability are measured

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Wang, Hai Long, Xiao Yan Sun, Qi Wen Peng, and Feng Xue. "Durability and Mechanical Behaviors of Steel Slag Powder Concrete." Applied Mechanics and Materials 438-439 (October 2013): 58–62. http://dx.doi.org/10.4028/www.scientific.net/amm.438-439.58.

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The mechanical behaviors and durability of concrete containing steel slag powder (SSP), silica fume (SF) and fly ash (FA) were presented in this study. The fresh concrete properties, compressive strength, split tensile strength, elastic modulus, stress-stain curve, chloride permeability as well as carbonation of concretes mixed with different SSP contents or concretes containing compound mineral admixture were tested. The experimental results reveal that the mechanical behaviors and durability of concrete with 10% SSP replacing cement are both improved than that of the reference concrete. Mech

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Nguyen, Chanh Van. "RATIONAL PRODUCTION AND TESTING METHOD THROUGH USING SELF COMPACTING CONCRETE." Science and Technology Development Journal 12, no. 18 (2009): 52–58. http://dx.doi.org/10.32508/stdj.v12i18.2383.

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The development of modern concretes to avoid vibration need. These are very fluid concretes called self compacting concrete(SCC). The result from the work show that it is possible to produce a self compacting concrete. Study of the influence of materials on the rheological properties of concrete. Definition of a mix design proceess of SCC. Development of tests for laboratory and constraction site. Promote the development of a more rational concrete production method.

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Węglorz, Marek, Andrzej Ajdukiewicz, and Alina Kliszczewicz. "Assessment of recycled concrete aggregate properties required for structural concretes." MATEC Web of Conferences 262 (2019): 06010. http://dx.doi.org/10.1051/matecconf/201926206010.

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Assessment of recycled aggregate concrete (RAC) properties by laboratory tests is still required due to lack of precise guidelines and with taking into account slightly different behaviour of such concretes in comparison with natural aggregate concretes (NAC). It is especially important when recycled concrete aggregates are used for the structural elements. In this paper, the following rules for the whole concrete recycling cycle were defined: (1) rules for examination of original concretes selected for recycling and (2) rules for aggregate preparation and their fractionize as well as design r

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Tanveer Majid, Muhammad. "The effect of twisted polymer fibers on the physical and mechanical properties of C35 concrete." Journal of Research in Science, Engineering and Technology 7, no. 4 (2020): 11–15. http://dx.doi.org/10.24200/jrset.vol7iss4pp11-15.

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Concrete as the most used material, is known as an integral part of construction. So far, many studies have been done in the field of improving the quality of concrete that most of them have examined change in concrete mix design; however, the use of additives and also replacing commonly used materials in concrete with new materials always has been considered. Today, different fibers, especially Forta fibers, are used. In this study, experiments on Forta fiber- reinforced concrete are described. The concrete mixing design and Forta fiber properties are also briefly described. The comparison be

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Yun, Yeon Jun, Kyung Lim Ahn, Won Gyun Lim, and Hyun Do Yun. "Effects of Steel Fiber Volume Fraction on Compressive and Flexural Behaviors of Alkali-Activated Slag (AAS) Concrete." Applied Mechanics and Materials 525 (February 2014): 469–72. http://dx.doi.org/10.4028/www.scientific.net/amm.525.469.

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This paper describes the experimental results on compressive and flexural behavior of alkali-activated slag (AAS) concrete reinforced with hooked end steel fiber. Two different fiber volume fractions of 0.5 and 1.0% were used for AAS concrete and Ordinary Portland cement (OPC) concretes were also mixed for comparison. Test results indicated that compressive and flexural performance of AAS concretes with water-to-binder (W/B) ratio of 0.55 are equivalent to those of OPC concrete. The addition of steel fiber to AAS concrete improves more compressive and flexural performance than those of steel f

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Wan, Chao Jun, Xu Chen, Teng Li, Tai Zhong Huang, and Tian Ming Deng. "Effect of Variability of Recycled Aggregate on Properties of Concrete." Applied Mechanics and Materials 174-177 (May 2012): 1122–32. http://dx.doi.org/10.4028/www.scientific.net/amm.174-177.1122.

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Low, medium and high variability of aggregates of concrete were designed and prepared and the influence of variability of recycled aggregates on the mechanical properties and durability of concretes was investigated. The experimental results indicated that the kinds of strengths, static compressive elastic modulus and durability of recycled concrete were decreased at engineering-acceptable level compared with natural aggregate concrete; the most properties of recycled concrete with high variability of recycled aggregates are not very different from that of recycled concrete with medium variabi

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Schindler, Anton, Benjamin Byard, and Aravind Tankasala. "Mitigation of early-age cracking in concrete structures." MATEC Web of Conferences 284 (2019): 07005. http://dx.doi.org/10.1051/matecconf/201928407005.

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Early-age cracking can adversely affect the behavior and durability of concrete elements. This paper will cover means to mitigate early-age cracking in concrete bridge decks and mass concrete elements. The development of in-place stresses is affected by the shrinkage, coefficient of thermal expansion, setting characteristics, restraint conditions, stress relaxation, and temperature history of the hardening concrete. The tensile strength is impacted by the cementitious materials, the water-cementitious materials ratio, the aggregate type and gradation, the curing (internal/external) provided, a

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USTABAŞ, İlker. "Use of Weight Maturity Method for Building Concretes Used in Artvin Yusufeli Dam Construction." Journal of Cement Based Composites 1, no. 1 (2019): 1–5. http://dx.doi.org/10.36937/cebacom.2020.001.001.

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The aim of this study is to compare the compressive strength determined by weight maturity method in dam concretes with compressive strength obtained from fresh concrete and core samples. Within the scope of the study, normal concretes of C25/30 strength class were produced. Samples were taken from ø15x30 cm cylinder molds from normal concrete mixtures having maximum aggregate grain diameter (Dmax) of 25 mm.In this study, the estimated compressive strengths were measured by using a maturity device and the compressive strengths obtained from samples taken from fresh concrete and core samples ta

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Koyankin, A. A., and V. M. Mitasov. "JOINTS IN CONCRETES OF DIFFERENT AGE AND TYPE." Vestnik Tomskogo gosudarstvennogo arkhitekturno-stroitel'nogo universiteta. JOURNAL of Construction and Architecture 22, no. 6 (2020): 94–104. http://dx.doi.org/10.31675/1607-1859-2020-22-6-94-104.

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The performance and structural reliability of concrete-to-concrete joints play an important role in precast-cast-in-place constructions, since they are responsible for deformation of concretes of different age, type and strength. The paper studies the effect of the joint type on its bearing capacity under shear loads. A horizontal test bench and a standard vertical press are used in the experiment to provide the shear load along the concrete-to-concrete joint (light cast-situ and heavy precast concretes). The following joint installing is considered: a smooth surface, which provides the concre

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Khattab, Mohammed, and Samya Hachemi. "Performance of Recycled Aggregate Concrete Made with Waste Refractory Brick." International Journal of Engineering Research in Africa 57 (November 9, 2021): 99–113. http://dx.doi.org/10.4028/www.scientific.net/jera.57.99.

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Concrete containing recycled aggregates have different properties from concrete containing natural aggregates. This work investigates, firstly, the possibility of using recycled refractory bricks (RBA) as coarse aggregate for concrete, and secondly, finds the ideal replacement percentage of natural coarse aggregate (NCA) by RBA. For this, an experimental study was carried out to assess the physical and mechanical properties of concrete produced with the partial and total replacement of NCA by RBA. Two types of RBA from two different sources were used, RBA-1 obtained from the grinding of new re

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Batog, Maciej, Michał Tałaj, Katarzyna Synowiec, and Zbigniew Giergiczny. "Impact of de‐icing salts on freeze‐thaw resistance of low‐clinker concretes." ce/papers 6, no. 6 (2023): 151–57. http://dx.doi.org/10.1002/cepa.2926.

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AbstractDe‐icing salts are commonly used in moderate climate zone, where concrete is subjected to freeze‐thaw cycles during winter times. The presence of de‐icing salts requires appropriate frost‐thaw resistance of concrete, which is challengingin case of low‐clinker concretes. Proper air‐entrainment of the concrete mix, which is one of the main factors affecting the frost resistance of concrete is not a simple task. Therefore, it is necessary to constantly improve the process of air‐entrainment of the concrete mix and to constantly control the effectiveness and quality of concrete aeration es

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Al-Neshawy, Fahim, Teemu Ojala, and Jouni Punkki. "Stability of Air Content in Fresh Concretes with PCE-Based Superplasticizers." Nordic Concrete Research 60, no. 1 (2019): 145–58. http://dx.doi.org/10.2478/ncr-2019-0093.

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Abstract Air contents of concrete are necessary for concrete durability in freeze-thaw exposure. According to the Finnish concrete code, the target value for air content varies between 4% and 5.5% for XF - exposure classes. Lately in Finland, some cases showed an elevation of air contents up to 15% in fresh air-entrained concrete at construction site and in drilled concrete samples. The objectives of this study were to investigate the stability of air entrainment by measuring the air content elevation 30 minutes and 60 minutes after concrete mixing and investigating the concrete sensitivity to

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Pushkar, Svetlana. "The Effect of Different Concrete Designs on the Life-Cycle Assessment of the Environmental Impacts of Concretes Containing Furnace Bottom-Ash Instead of Sand." Sustainability 11, no. 15 (2019): 4083. http://dx.doi.org/10.3390/su11154083.

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The results of life-cycle assessments (LCAs) of concrete are highly dependent on the concrete design method. In this study, LCAs were conducted to evaluate the environmental impacts of the replacement of sand with furnace bottom-ash (FBA) in concrete. In the FBA-based concretes, sand was replaced with FBA at proportions of 0, 30, 50, 70, and 100 wt%. Two design methods were studied: (i) concrete with fixed slump ranges of 0–10 mm (CON-fix-SLUMP-0-10) and 30–60 mm (CON-fix-SLUMP-30-60); and (ii) concrete with fixed water/cement (W/C) ratios of 0.45 (CON-fix-W/C-0.45) and 0.55 (CON-fix-W/C-0.55)

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Ke, Chang Jun, Hao Wang, and Tao Ke. "Activation Mechanism of Cement Paste for Waste Concrete Autoclaved Products." Advanced Materials Research 168-170 (December 2010): 949–53. http://dx.doi.org/10.4028/www.scientific.net/amr.168-170.949.

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studied types and amount of hydration products in cement paste in waste concretes and effect of the cement paste in waste concrete for compressive strength of autoclaved waste concrete samples simulated by hydrated cement with X-ray Diffraction (XRD), Scanning Electron Microscope (SEM) and Infrared Spectroscopy (IR). The results showed, compressive strength of autoclaved waste concrete products increased with cement paste in waste concrete increasing, and the effect reduced obviously when amount of cement paste exceed 12.5% in waste concrete. Cement paste calculated amount exceeds 12.5% accord

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Kubissa, Wojciech, Barbara Pacewska, and Iwona Wilińska. "Comparative Investigations of some Properties Related to Durability of Cement Concretes Containing Different Fly Ashes." Advanced Materials Research 1054 (October 2014): 154–61. http://dx.doi.org/10.4028/www.scientific.net/amr.1054.154.

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The results of research of mechanical properties and selected other characteristics influencing durability of cement concretes containing cement substitutes were presented. Cement concretes performed with conventional fly ash, fluidised fly ash and their mixture were investigated. The obtained results were compared with findings registered for two types of concrete performed without cement replacements and with cement concrete containing silica fume. The results have shown that cement concrete with predetermined 28-day compressive strength of about 50 MPa and good workability may be obtained u

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Savytskyi, Mykola, Kostyantyn Sukhyy, Oleksandr Savytskyi, Maryna Babenko, and Tetyana Shevchenko. "Carbon materials for electrically conductive concrete." E3S Web of Conferences 534 (2024): 01019. http://dx.doi.org/10.1051/e3sconf/202453401019.

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In recent decades, the direction of building materials science related to the creation of Smart Concretes has been rapidly developing. Smart Concretes, in addition to the functions of a structural material, also perform other functions that are related to their new properties. Among the large number of Smart Concretes, it is necessary to highlight Electrically Conductive Smart Concrete. This type of concrete is obtained by adding conductive fillers to the concrete mixture. Among them, carbon materials are the most promising in terms of their properties. Despite the large number of conducted st

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Косухин, Mikhail Kosukhin, Косухин, and Andrey Kosukhin. "THEORETICAL AND METHODOLOGICAL BASIS OF CREATING POLYFUNCTIONAL MODIFIERS OF MASS CONCRETES FOR RECONSTRUCTION WORKS." Bulletin of Belgorod State Technological University named after. V. G. Shukhov 2, no. 1 (2016): 23–32. http://dx.doi.org/10.12737/23293.

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The findings of the known research in the sphere of concretes and concrete mixes chemical modification have been generalized and systematized; the theoretical statements and methodological recommendations in creating high-performance polyfunctional modifiers have been presented. It was demonstrated that the leading role in concrete modification is played nowadays by this class of additives, as their application provides concretes and concrete mixes with a set of prescribed properties for their operation in various conditions. It was pointed out that this sector is especially relevant in mass c

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