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Journal articles on the topic 'Concrete remains'

Author: Grafiati

Published: 4 June 2021

Last updated: 8 February 2022

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1

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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2

Łukowski, Paweł, Ali Salih, and Joanna J. Sokołowska. "Frost resistance of concretes containing ground granulated blast-furnace slag." MATEC Web of Conferences 163 (2018): 05001. http://dx.doi.org/10.1051/matecconf/201816305001.

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The paper deals with the influence of addition of ground granulated blast-furnace slag (GGBS) on the frost resistance of concrete. GGBS is a valuable modifier of concrete, having the latent hydraulic properties and particularly improving the chemical resistance of concrete. However, the performance of concretes with blast-furnace slag under freezing and thawing action is still not explained fully and remains a subject to discussion. The authors have investigated the concretes containing various amounts of GGBS and the portland cement CEM I, with various values of water to binder ratio, with an

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3

Yang, Hai Feng, Zhi Heng Deng, and Ying Huang. "Analysis of Stress - Strain Curve on Recycled Aggregate Concrete under Uniaxial and Conventional Triaxial Compression." Advanced Materials Research 168-170 (December 2010): 900–905. http://dx.doi.org/10.4028/www.scientific.net/amr.168-170.900.

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43 Φ50mm × 100mm column stress - strain curve tests are completed through RMT-201, which studied the compressive stress - strain curves of recycled aggregate concretes at distinct confining pressures under conventional triaxial stress state. This article, has analyzed the influence of different water-cement ratios, confining pressures on the curves, and raised constitutive equations of triaxial compression stress - strain curves for the different strength of recycled aggregate concretes.The brittleness indexes for recycled aggregate concrete under distinct confining pressures were analyzed con

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4

Deng, Zhi Heng, Li Chen, Jian Qian, and Chao Lou Meng. "Experimental Study on Stress-Strain Curve of Recycled Coarse Aggregate Concrete under Uniaxial Compression." Applied Mechanics and Materials 357-360 (August 2013): 1415–19. http://dx.doi.org/10.4028/www.scientific.net/amm.357-360.1415.

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In order to study the mechanical properties of recycled concrete with the same strength, three kinds of recycled concrete have been made which their intensities reached C25, C30, C35 at the recycled coarse aggregate replacement ratios (0%, 50%, 100%), and severally completed the stress-strain curve test on the same strength of recycled concrete, separately analyzed the variance about failure pattern and peak strain, elastic modulus that all belonged to recycled concrete under the condition of the same strength. Studies have shown that the overall shape of recycled concretes stress-strain curve

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5

Solnit, Rebecca, and Alex Fradkin. "Concrete in Paradise." Boom 1, no. 2 (2011): 6–16. http://dx.doi.org/10.1525/boom.2011.1.2.6.

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This essay documents and examines the remains of military bunkers along the California coast. These structures, monuments to the grim anticipation of war, appear to be intrusions upon the beauty of the landscape, but we might also view them as witnesses to the nation’s particular imagination of danger during the 20th Century, and more specifically, to California’s ever deepening relationship with the defense industry.

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6

Yang, Kai, Muhammed Basheer, Sreejith Nanukuttan, Yun Bai, and Adrian Long. "Effectiveness of two field methods of saturating near surface concrete on the water permeability of in situ concrete." MATEC Web of Conferences 289 (2019): 06004. http://dx.doi.org/10.1051/matecconf/201928906004.

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Determining the water permeability of concrete in structures remains a challenge because of difficulties in removing the influence of its moisture content. Saturating concrete with water could be one option, but this is not easy to achieve on site. This paper reports a testing programme carried out to assess the reliability and effectiveness of two field saturation methods, viz. vacuum saturation and ponding. The water permeability test results after applying the vacuum saturation and ponding were compared with that obtained after incremental immersion. It was found that ponding was unable to

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7

Neamat, Sevar, and Mahmood Shamsborhan. "The Investigation of The Different Types of the Ground Rebar Spacers with Proposing New Design Rebar Space Mixed of Concrete Palstic." Journal of Civil Engineering Frontiers 1, no. 1 (2020): 01–06. http://dx.doi.org/10.38094/jocef114.

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The reinforcing spacers are commonly prepared from cementitious material, plastic or metals. These spacers are prepared to provide the reinforcing steel with ensuring that the requested concrete cover thickness is attained to guard surrounded steel from corrosion. Also, they pretend a vital role in the concrete structure performance. The toughness of reinforced concrete buildings remains extremely reliant on the features of the protection of concrete to be strong with thickness. A disappointment in finding cover thickness is considered the main impact on early deterioration within the steel, w

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Zajceva, Ljajsjan, Ekaterina Lucyk, Tat’jana Latypova, Valerij Latypov, Pavel Fedorov, and Madina Salamanova. "Influence of the Type of Aggregate from Industrial Waste on Corrosion Resistance of Modified Fine-Grained Concrete." Buildings 11, no. 8 (2021): 352. http://dx.doi.org/10.3390/buildings11080352.

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The development and implementation of “green” technologies in the construction sector, which ensure natural resource conservation, reduce harmful emissions and provide utilization of industrial waste, are key issues in material engineering of the XXI century. Extensive research has been devoted to solving these issues, including research in the field of concrete science. Still, the issue of developing concrete compositions with increased corrosion resistance remains much less studied. At the same time, reactive aggregates from industrial waste can have positive effect on durability of concrete

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9

Belaoura, Mebarek, Dalila Chiheb, Mohamed Nadjib Oudjit, and Abderrahim Bali. "Temperature Effect on the Mechanical Properties of Very High Performance Concrete." International Journal of Engineering Research in Africa 34 (January 2018): 29–39. http://dx.doi.org/10.4028/www.scientific.net/jera.34.29.

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This study aims at a better understanding of the behaviour of very high performance concretes (VHPC) subjected to high temperatures. The temperature increase within the concrete originating from the hydratation exothermic reaction of cement is emphasized by the mass effect of the structures and can lead to thermal variations of around 50°C between the heart and the structures walls. These thermal considerations are not without consequence on durability and the physical and mechanical properties of very high performance concrete, such as the compressive strength. This work is an experimental re

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Chiheb, Dalila, Mebarek Belaoura, Mohamed Nadib Oudjit, and Abderrahim Bali. "Mechanical Behavior and Shrinkage of Algerian Very High Performance Concrete Using Local Materials." International Journal of Engineering Research in Africa 29 (March 2017): 81–89. http://dx.doi.org/10.4028/www.scientific.net/jera.29.81.

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In some parts of Algeria, the alluvial deposits are depleted. Optimizing the use of available resources, has become gradually urgent need and more and more important. Algeria does not remain on the sidelines of this idea, an approach is part of a sustainable development has been developed to make available to the manufacturer a steady stream of material coming from the exploitation of limestone. The importance of this production can be explained by the activity of the carrier ever growing sector. Research programs have been launched in Algeria to focus on aspects, related to the composition of

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11

Moskalenko, Oleksandr, and Rayisa Runova. "Ice Formation as an Indicator of Frost-Resistance on the Concrete Containing Slag Cement in Conditions of Freezing and Thawing." Materials Science Forum 865 (August 2016): 145–50. http://dx.doi.org/10.4028/www.scientific.net/msf.865.145.

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The connection with the icing on the frost resistance of concrete containing slag cement and chemical additives «MC Bauchemie» under freezing and thawing.It is shown that freeze concrete samples at (-) 10°C increase in the amount of slag from 30 to 70 wt.% Of binder in the composition leads to an increase in the index of ice formation in the concrete of 1.7 ... 1.9 times compared with the concrete obtained at a slag containing slag cement with a content of 10 wt.%. Frost resistance of concrete is reduce from F450 to F400.When freezing of concrete samples at (-) 20°C increase in the amount of s

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12

Skripkiūnas, Gintautas, and Vitoldas Vaitkevičius. "THE INFLUENCE OF COARSE AGGREGATE CONCENTRATION ON THE STRENGTH OF CONCRETE AND ON THE POROSITY OF CONCRETE MORTAR/STAMBIOJO UŽPILDO KONCENTRACIJOS ĮTAKA BETONO STIPRUMUI IR SKIEDININĖS DALIES PORINGUMUI." JOURNAL OF CIVIL ENGINEERING AND MANAGEMENT 7, no. 6 (2001): 446–52. http://dx.doi.org/10.3846/13921525.2001.10531771.

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The results of experiments dealing with coarse aggregate concentration influence on the concrete strength and the structure of hardened cement paste and mortar of concrete are presented in the paper. Experiments were performed on concrete with dense coarse aggregate (crushed granite) which strength is more than strength of mortar and lightweight porous aggregate (expanded clay aggregate) with strength less than that of mortar. Physical and mechanical properties of concrete with dense coarse aggregate are presented in Table 1 and the concretes with the porous coarse aggregate in Table 2. The de

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13

Muhaimin, Ahmad Aki, Mohamed Adel, and Kohei Nagai. "Investigating the Effect of Repeated High Water Pressure on the Compressive and Bond Strength of Concrete with/without Steel Bar." Materials 14, no. 3 (2021): 527. http://dx.doi.org/10.3390/ma14030527.

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The application of reinforced concrete for permanent and temporary deep ocean structures has recently become more prevalent; however, the static and dynamic effects of high water pressure on concrete remain unexplored. This paper investigates the influence of high water pressure (60 MPa) on four series of concrete cylinders with and without an embedded steel bar under sustained and cyclic loading conditions. The residual compressive strength, bond strength, and associated evolution of surface and internal damage are evaluated after exposing concrete cylinders to a water pressure of 60 MPa. The

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14

Rivera, Rosa Abnelia, Miguel Ángel Sanjuán, Domingo Alfonso Martín, and Jorge Luis Costafreda. "Performance of Ground Granulated Blast-Furnace Slag and Coal Fly Ash Ternary Portland Cements Exposed to Natural Carbonation." Materials 14, no. 12 (2021): 3239. http://dx.doi.org/10.3390/ma14123239.

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Ternary Portland cements are new cementitious materials that contain different amounts of cement replacements. Ternary Portland cements composed of granulated blast-furnace slag (GBFS), coal fly ash (CFA), and clinker (K) can afford some environmental advantages by lowering the Portland cement clinker use. Accordingly, this is an opportunity to reduce carbon dioxide emissions and achieve net-zero carbon emissions by 2050. Furthermore, GBFS and CFA possess pozzolanic properties and enhance the mechanical strength and durability at later ages. Compressive strength and natural carbonation tests w

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15

Jiang, Fengjiao, Jinxin Gong, Jichao Zhu, and Huan Wang. "Study on the Concrete in Chloride Environment Based on Electrochemical Impedance Spectroscopy." International Journal of Pattern Recognition and Artificial Intelligence 34, no. 06 (2019): 2059017. http://dx.doi.org/10.1142/s021800142059017x.

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In this paper, the effect of water-cement ratio and chloride ions on the concrete meso-structure was studied. Three kinds of concrete cubes with different water-cement ratios were immersed in fresh water and salt water, respectively. Then, the Electrochemical Impedance Spectroscopy (EIS) analysis of various test cubes were carried out by using electrochemical workstation. The results show that the salt water can improve electric double layer capacitance in the test cubes with the same water-cement ratio, but it can reduce some other parameters such as resistance of pore solution, resistance to

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16

Fletcher, Ian, Stephen Welch, José Torero, Richard Carvel, and Asif Usmani. "Behaviour of concrete structures in fire." Thermal Science 11, no. 2 (2007): 37–52. http://dx.doi.org/10.2298/tsci0702037f.

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This paper provides a "state-of-the-art" review of research into the effects of high temperature on concrete and concrete structures, extending to a range of forms of construction, including novel developments. The nature of concrete-based structures means that they generally perform very well in fire. However, concrete is fundamentally a complex material and its properties can change dramatically when exposed to high temperatures. The principal effects of fire on concrete are loss of compressive strength, and spalling - the forcible ejection of material from the surface of a member. Though a

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17

Tošić, Nikola, Snežana Marinković, and Yahya Kurama. "Improved Serviceability and Environmental Performance of One-Way Slabs through the Use of Layered Natural and Recycled Aggregate Concrete." Sustainability 12, no. 24 (2020): 10278. http://dx.doi.org/10.3390/su122410278.

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Recycled aggregate concrete (RAC), i.e., concrete produced with recycled concrete aggregate (RCA) has been heavily investigated recently, and the structural design of RAC is entering into design codes. Nonetheless, the service load deflection behavior of RAC remains a challenge due to its larger shrinkage and creep, and lower modulus of elasticity. A novel solution to this challenge is the use of layered concrete, i.e., casting of horizontal layers of different concretes. To investigate the potential benefits and limits of layered concrete, this study contains a numerical parametric assessment

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18

Bakera, Alice T., and Mark G. Alexander. "Use of metakaolin as supplementary cementitious material in concrete, with focus on durability properties." RILEM Technical Letters 4 (November 12, 2019): 89–102. http://dx.doi.org/10.21809/rilemtechlett.2019.94.

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Numerous research efforts on metakaolin as a supplementary cementitious material (SCM) have been undertaken in the past 20 years. This material, while relatively expensive mainly due to low production volumes worldwide, nevertheless has a significantly lower production cost than Portland cement. However, industry remains tentative in considering metakaolin in concrete. This paper takes the view that industry should consider investing in the production and application of metakaolin in appropriate concrete projects, particularly in aggressive environments where plain Portland cement may be inade

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19

Abd Rahman, Norashidah, Siti Amirah Azra Khairuddin, Norwati Jamaluddin, and Zainorizuan Mohd Jaini. "Strength of Reinforced Fibrous Foamed Concrete-Filled Hollow Section." Materials Science Forum 936 (October 2018): 219–23. http://dx.doi.org/10.4028/www.scientific.net/msf.936.219.

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At present, research on concrete-filled sections extends to using lightweight concrete to reduce the total weight of such structures. However, research on concrete-filled hollow sections (CFHS) using foamed concrete remains ongoing. Therefore, this study was conducted to determine the strength of reinforced fibrous foamed CFHSs. Two types of fibre, namely, steel and polypropylene fibres, were used. A short-column specimen was prepared and tested under compression load. Result shows that adding steel fibre to foamed concrete indicates a higher strength than adding polypropylene fibre. The stren

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20

Hubertová, Michala, and Pavel Hladík. "Precast Floor Plates from Lightweight Concrete." Advanced Materials Research 1106 (June 2015): 152–55. http://dx.doi.org/10.4028/www.scientific.net/amr.1106.152.

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The paper deals with a system of precast floor plates from lightweight concrete intended mainly for building of family houses and residential construction. The developed system has two types of precast floor plates made from lightweight concrete: floor plates for floor systems and solid section floor plates. This paper describes solid section floor plates. The unambiguous advantage of lightweight concrete floor construction is weight lower by as much as 37% compared to floor structure made from common concrete, while bearing strength remains unchanged as well as high fire resistance. This type

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21

Wang, Zhi Yun, and Shou Ju Li. "Analytical Computational Models for Relationship between Ultimate Bending Moment of Concrete Segments and Axial Force." Key Engineering Materials 853 (July 2020): 177–81. http://dx.doi.org/10.4028/www.scientific.net/kem.853.177.

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Concrete segments are widely used to support soil and water loadings in shield-excavated tunnels. Concrete segments burden simultaneously to the loadings of bending moments and axial forces. Based on plane deformation assumption of material mechanics, in which plane section before bending remains plane after bending, ultimate bending moment model is proposed to compute ultimate bearing capacity of concrete segments. Ultimate bending moments of concrete segments computed by analytical models agree well with numerical simulation results by FEM. The accuracy of proposed analytical computational m

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22

Bahadori, Hadi, and Payam Hosseini. "REDUCTION OF CEMENT CONSUMPTION BY THE AID OF SILICA NANO-PARTICLES (INVESTIGATION ON CONCRETE PROPERTIES)." Journal of Civil Engineering and Management 18, no. 3 (2012): 416–25. http://dx.doi.org/10.3846/13923730.2012.698912.

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In this study, effects of replacing cement with colloidal amorphous silica nano-particles have been experimentally investigated on the physical and mechanical properties, durability and microstructure of concrete. Experimental results include workability, fresh concrete density, and hardened concrete properties like compressive strength at different ages of 3, 7, and 28-days, and also 28-days splitting tensile strength. Furthermore, influence of silica nano-particles on durability and microstructure of concrete for 28-days specimens was tested by conducting water absorption test, Scanning Elec

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23

Abdel-Sayed, George, and Kwok-Cheung Chung. "Composite cold-formed steel–concrete columns." Canadian Journal of Civil Engineering 14, no. 3 (1987): 295–301. http://dx.doi.org/10.1139/l87-047.

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A new system of composite columns is developed using lipped cold-formed steel channels with embossments and cast-in-place concrete. The combined action of the embossments and the channel's lips leads to very good bond between the steel and the concrete. It has been found that by replacing the standard longitudinal reinforcing bars by cold-formed steel sections of equal area, the structural performance of the columns remains almost unchanged, while considerable savings are achieved in time and material of construction. The present paper outlines the main characteristics of the proposed columns

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24

Tu, Min, Jun Deng, and Yi Wang. "Experimental study on heat transfer of concrete at high temperatures under hygrothermal environment." MATEC Web of Conferences 275 (2019): 02020. http://dx.doi.org/10.1051/matecconf/201927502020.

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Safety of concrete structures could be threatened under fire exposure, especially for structures under hygrothermal environment. Existing studies have shown that concrete contains large amount of moisture could induce spalling failure and the temperature is a critical parameter for the damage. However, until now, the study for heat transfer of concrete with different saturation degree remains limited. In this paper, the temperature increase of concrete specimens with different saturation degree is experimentally studied. Results show that the temperature increase rate could be affected by the

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Zhao, Gaowen, Mei Shi, Mengzhen Guo, and Henghui Fan. "Degradation Mechanism of Concrete Subjected to External Sulfate Attack: Comparison of Different Curing Conditions." Materials 13, no. 14 (2020): 3179. http://dx.doi.org/10.3390/ma13143179.

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Sulfate induced degradation of concrete brings great damage to concrete structures in saline or offshore areas. The degradation mechanism of cast-in-situ concrete still remains unclear. This paper investigates the degradation process and corresponding mechanism of cast-in-situ concrete when immersed in sulfate-rich corrosive environments. Concrete samples with different curing conditions were prepared and immersed in sulfate solutions for 12 months to simulate the corrosion of precast and cast-in-situ concrete structures, respectively. Tests regarding the changes of physical, chemical, and mec

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Sheikh, Shamim A., Michael W. O'Neill, and M. A. Mehrazarin. "Expansive concrete drilled shafts." Canadian Journal of Civil Engineering 12, no. 2 (1985): 382–95. http://dx.doi.org/10.1139/l85-041.

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A hypothesis is presented in this paper that states that expansive cement concrete produces a stronger bond between the concrete in a drilled shaft (bored pile) and the surrounding soil than does normal cement; this results in an increase in the frictional component of capacity and a reduction in the settlement of the shaft at working load levels.Four types of expansive cement, type "K" cement (the expansive cement available commercially) and three made from commercially available materials, were tested for their expansion characteristics; two of them were selected to be used in two instrument

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Fallon, Chanel, and Graham J. McShane. "Impact damage protection mechanisms for elastomer-coated concrete." International Journal of Protective Structures 12, no. 3 (2021): 377–95. http://dx.doi.org/10.1177/2041419620984811.

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Cost-efficient strategies for protecting structural elements against the effects of explosive detonations are of interest for vulnerable infrastructure. Dynamic loading due to both blast pressures and impact from fragments are of concern. This investigation focuses on the protection of concrete structural elements against impact damage. A recent experimental study by the authors demonstrated that an elastomer coating can provide a significant impact mitigating effect when applied to the impacted face of a concrete substrate. Preliminary numerical results have indicated that the elastomer serve

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28

Jin, Lu, and Zhu Ge Yan. "A Markov Chain Monte Carlo Technique Based Optimal Mix Design of Porous Concrete." Applied Mechanics and Materials 357-360 (August 2013): 959–62. http://dx.doi.org/10.4028/www.scientific.net/amm.357-360.959.

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Porous concrete is one of the innovative and promising concrete products, which is featured with a relatively high water permeability rate. Compared with conventional concrete products, due to the lack of fine aggregates in the mix design of porous concrete, the void spaces between the coarse aggregates remains unfilled and causes a large amount of porosity in the hardened concrete mass. On the other hand, the strength of porous concrete is usually lower than that of the conventional concrete products due to the lack of fine aggregates. For the purpose of achieving a relatively high strength o

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29

Syed Ishtiaq, Ahmad, and Roy Sushanta. "Effect of Crushed Clay Brick as Coarse Aggregate on Creep Behavior of Concrete." Advanced Materials Research 261-263 (May 2011): 178–81. http://dx.doi.org/10.4028/www.scientific.net/amr.261-263.178.

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Difference between creep behaviors of concrete made from stone chips and crushed clay bricks, i.e. brick chips as coarse aggregate are examined by means of creep testing on their representative samples. Two different grades of concrete 17.2 and 27.5 N/mm2 are prepared from brick chips and stone chips using appropriate mix design and are tested for creep for up to 50 days. Stone chips and brick chips aggregates used are selected in a way so that their gradation and fineness modulus remains as close as possible. Results from creep testing shows that concrete made from brick chips as coarse aggre

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Forcucci, Jessica A., Alexander T. Damron, and Nicholas I. Batalis. "Examination of Human Remains Encased in Concrete: A Case Report and Review of the Literature." Academic Forensic Pathology 3, no. 3 (2013): 336–43. http://dx.doi.org/10.23907/2013.044.

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Liu, Zhaolei, Lei Yu, and Shuxiong Zhang. "Interface Detection of Concrete and Slurry in Cast-in Place Pile." MATEC Web of Conferences 238 (2018): 02013. http://dx.doi.org/10.1051/matecconf/201823802013.

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To find the interface of concrete and slurry in a cast-in place pile, the numerical simulation method and Laboratory tests are performed. Pressures along a pipe were obtained. Differential pressures of fixed distance were calculated. Differential pressure curves were plotted. The result shows that pressure along a pipe is differ. Differential pressure remains constant in certain mediums but changes across different mediums. The interface of concrete and slurry can be found from differential pressure plots. If transducers whose number is at least two can be tied on a fixed place of pipe, differ

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Li, Wei Hong, Ying Ying Xu, and Yi Han Wang. "Experiment Study on Concrete Resistance to Chloride Ion Penetration." Applied Mechanics and Materials 716-717 (December 2014): 236–39. http://dx.doi.org/10.4028/www.scientific.net/amm.716-717.236.

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The influence law of permeability of chloride ion in concrete of load level, curing condition under the sustained pressure load and the corrosion environment interaction is researched in this article, which is through natural diffusion method. Experimental results show that as the load level increases, there is a tendency of the chloride ion content after the first increase and then decrease, the turning point in the middle remains to be further studied. Good conservation condition reduces large holes and harmful holes in concrete block, thereby reduce the porosity and improve resistance to ch

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33

Mogetta, Marcello. "A New Date for Concrete in Rome." Journal of Roman Studies 105 (April 24, 2015): 1–40. http://dx.doi.org/10.1017/s007543581500043x.

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AbstractConcrete is regarded as a quintessentially Roman achievement. The spread of the technology is usually dated to the fourth or third centuriesb.c., and interpreted as a symptom of Rome's early expansion in Italy. In this paper I offer a reappraisal of the available evidence for early concrete construction in Rome. On the basis of stratigraphic evidence, I conclude that a later date should be assigned to most of the remains. I situate the origins of the technological innovation within the radical change in architectural styles that unfolded in the middle of the second centuryb.c., affecti

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34

Marques, Márcio Alexandre, Maria Lúcia Pereira Antunes, Sandro Donnini Mancini, and Paulo Silas Oliveira. "Interpretation of X-Ray Images to Investigate the Viability of Incorporating Poly(Ethylene-co-Vinyl Acetate) (EVA) Waste in Portland Cement." Materials Science Forum 958 (June 2019): 105–10. http://dx.doi.org/10.4028/www.scientific.net/msf.958.105.

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EVA (poly (ethylene-co-vinyl acetate)) is a copolymer widely used in the Brazilian footwear industry, where approximately 18% of the EVA remains as waste, principally after the cutting out of insoles. EVA wastes cannot be recycled or reused for the original purpose, but it may be possible to add them to Portland cement to produce concrete for non-structural applications in constructions. This work presents an analytical technique based on the interpretation of X-ray images to assess the spatial distributions of these wastes within concrete test specimens. Evaluation was made of the feasibility

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35

Bahlis, Jihad B., and M. Saeedmirza. "Nonlinear analysis of planar reinforced concrete structures." Canadian Journal of Civil Engineering 14, no. 6 (1987): 771–79. http://dx.doi.org/10.1139/l87-115.

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A new, simple, hypoelastic, and anisotropic stress–strain relationship is proposed for modeling the behaviour of concrete subjected to a general state of monotonic loading. The proposed model reduces to an incremental orthotropic model if the direction of the principal stress axes remains constant. It also eliminates the inability of the orthotropic constitutive relationships to model the behaviour of concrete under a general state of monotonic loading when the principal stress axes rotate during the loading process.The capability and reliability of the proposed model for the analysis of struc

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Madureira, E. L., T. M. Siqueira, and E. C. Rodrigues. "Creep strains on reinforced concrete columns." Revista IBRACON de Estruturas e Materiais 6, no. 4 (2013): 537–60. http://dx.doi.org/10.1590/s1983-41952013000400003.

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A concrete element when kept under sustained load presents progressive strain over time, associated to the creep. In reinforced concrete columns, such deformations cause the stress increase in the steel bars of the reinforcement and may induce the material to undergo the yielding phenomenon. The pioneering formulations about the creep effect, developed on the base of creep coefficient, are applicable, especially, when the stress magnitude remains constant. Its application to reinforced concrete members, which exhibits change in stress magnitude, requires simplifications of which result the mem

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Borbon-Almada, Ana C., Jorge Lucero-Alvarez, Norma A. Rodriguez-Muñoz, et al. "Design and Application of Cellular Concrete on a Mexican Residential Building and Its Influence on Energy Savings in Hot Climates: Projections to 2050." Applied Sciences 10, no. 22 (2020): 8225. http://dx.doi.org/10.3390/app10228225.

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The thermal performance of economical housing located in hot climates remains a pending subject, especially in emerging economies. A cellular concrete mixture was designed, considering its thermophysical properties, to apply the new material into building envelopes. The proposed materials have low density and thermal conductivity to be used as a nonstructural lightweight construction element. From the design stage, a series of wall systems based on cellular concrete was proposed. Whereas in the second phase, the materials were analyzed to obtain the potential energy savings using dynamic simul

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Asinor, Adamtey Simon, and Ofosu Samuel Anim. "Assessing the Strength of Lightweight Concrete using Oil Palm Shells (OPS) as Coarse Aggregates." International Journal of Technology and Management Research 1, no. 3 (2020): 26–31. http://dx.doi.org/10.47127/ijtmr.v1i3.32.

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The usage of concrete spans the length of civilization and in modern day construction environment, concrete remains one of its major materials. As a result of high cost of construction and construction materials especially in Ghana and other developing countries in West Africa, different efforts have been made to find alternative local building materials to substitute wholly or partly some of the constituents of concrete. This paper looks at the potential of oil palm shells (OPS) as coarse aggregate in lightweight concrete by mainly assessing the compressive strength of OPS concrete and also e

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Kumar, Dinesh, and Mykolas Daugevičius. "INFLUENCE OF HPFRCC COMPRESSIVE STRENGTH AND CONFINEMENT ON CONCRETE." Engineering Structures and Technologies 11, no. 2 (2019): 50–56. http://dx.doi.org/10.3846/est.2019.10679.

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The article analyses behavior of compressed concrete cylinders which were strengthened with external high performance fiber reinforced cementitious composite (HPFRCC) layer. Two different HPFRCC materials were used for the strengthening, which differed in fiber type. Two different types of loading were applied as well. The load was transferred through the whole cross section of the strengthened element and through the core – internal concrete. Loading through the whole cross section allows to validate the mixture law. Loading through the internal concrete allows to investigate the confinement

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Halahla, Abdulsamee M., Mohammad Akhtar, and Amin H. Almasri. "Utilization of Demolished Waste as Coarse Aggregate in Concrete." Civil Engineering Journal 5, no. 3 (2019): 540. http://dx.doi.org/10.28991/cej-2019-03091266.

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Demolishing concrete building usually produces huge amounts of remains and wastes worldwide that have promising possibilities to be utilized as coarse aggregate for new mixes of concrete. High numbers of structures around the world currently need to be removed for several reasons, such as reaching the end of the expected life, to be replaced by new investments, or were not built by the local and international standards. Maintaining or removal of such structures leads to large quantities of concrete ruins. Reusing these concrete wastes will help in saving landfill spaces in addition to more sus

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Van Steen, Charlotte, and Els Verstrynge. "Degradation Monitoring in Reinforced Concrete with 3D Localization of Rebar Corrosion and Related Concrete Cracking." Applied Sciences 11, no. 15 (2021): 6772. http://dx.doi.org/10.3390/app11156772.

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Corrosion of the reinforcement is a major degradation mechanism affecting durability and safety of reinforced concrete (RC) structures. As the corrosion process starts internally, it can take years before visual damage can be noticed on the surface, resulting in an overall degraded condition and leading to large financial costs for maintenance and repair. The acoustic emission (AE) technique enables the continuous monitoring of the progress of internal cracking in a non-invasive way. However, as RC is a heterogeneous material, reliable damage detection and localization remains challenging. Thi

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de Corte, Wouter, and Veerle Boel. "Fatigue Properties of Dynamically Loaded Self-Compacting Concrete." Key Engineering Materials 452-453 (November 2010): 633–36. http://dx.doi.org/10.4028/www.scientific.net/kem.452-453.633.

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Many civil structures are subjected to dynamic loading with load cycles exceeding 100.000 to 100.000.000 or more depending on the type of structure. At such high amounts of load cycles concrete can fail due to fatigue damage. The phenomenon is well understood and documented in the literature for traditional concrete. It remains unclear whether these conclusions can be transferred to self-compacting concrete (SCC), due to changes in concrete composition, decrease in the size of the coarse aggregates in combination with the addition of filler and superplasticizer. For this paper several reinforc

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Banthia, N., R. Gupta, and S. Mindess. "Development of fiber reinforced concrete repair materials." Canadian Journal of Civil Engineering 33, no. 2 (2006): 126–33. http://dx.doi.org/10.1139/l05-093.

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Early age shrinkage cracking remains a critical concern for cement-based repairs and overlays. Fibers mitigate such cracking, but no standardized technique of assessing the performance of a given fiber exists. Recently, a novel technique of making such an assessment was developed at The University of British Columbia (UBC). In this test method, currently being balloted through the ASTM, an overlay of fiber reinforced concrete (FRC) material to be tested is cast directly on a fully matured sub-base with protuberances, and the entire assembly is subjected to controlled drying. Cracking in the ov

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Li, Wei Hong, and Ying Ying Xu. "Penetration of Chlorine Ion in Concrete under the Coupling Effect of the Continues Pressure Load and the Corrosion Environment." Key Engineering Materials 633 (November 2014): 140–44. http://dx.doi.org/10.4028/www.scientific.net/kem.633.140.

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This paper studies the influence law of experiment time, load level under sustained pressure load and the corrosion environment interaction on the permeability of chloride ion in concrete,which is through natural diffusion method. Experimental results show that with the increase of the test time, the penetration depth of chloride ions in concrete and the content of chloride ions in the same penetration depth is growing. As the load level increases, there is a tendency of the chloride ion content after the first increase and then decrease, the turning point in the middle remains to be studied.

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Wu, Shie-Shin. "Developing a Quantitative Rating System for Continuously Reinforced Concrete Pavement." Transportation Research Record: Journal of the Transportation Research Board 1699, no. 1 (2000): 11–15. http://dx.doi.org/10.3141/1699-02.

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A jointed concrete pavement rating system based on sampling and quantitative surface distress data was developed several years ago for North Carolina. This rating system has been adopted by the pavement management system for the priority ranking of projects. The first attempt to develop a similar rating system for continuously reinforced concrete (CRC) pavement was made with no fruitful results. There remains an urgent need for a comparable CRC rating system for project ranking. Another attempt that used a different approach was made. A linear regression equation was developed, and the correla

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Zhang, Haiyan, Jiancheng Liu, Bo Wu, and Zhijian Zhang. "Axial Compressive Behavior of Geopolymer Recycled Lump Concrete." Materials 13, no. 3 (2020): 533. http://dx.doi.org/10.3390/ma13030533.

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To reduce the environmental pollution from cement production and the damage to natural resources from aggregate mining in the concrete industry, a relatively new concrete, termed geopolymer recycled lump concrete (GRLC), which uses geopolymer as the binding material to replace traditional cement and uses large demolished concrete lumps (DCLs) to partly replace concrete, is prepared in this study. Cubic and cylindrical GRLC specimens containing fresh geopolymer concrete and DCLs were tested under axial compression with various parameters, including the compressive strength levels of both fresh

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Noufid, Abdelhamid, and Sougrati Belattar. "Use of Fillers for Optimal Formulation of Self-Compacting Concretes." Civil Engineering Journal 4, no. 1 (2018): 67. http://dx.doi.org/10.28991/cej-030969.

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The objective of this study is to achieve an optimal formulation of self-compacting concrete using local materials from the country of Morocco, the use of this type of concrete remains very limited compared to a concrete vibrated in this country, due to lack mastery by companies. We will therefore try to study an optimal formulation that respects European standards and gives comparable results, even improved, to those of vibrated concrete, in order to be able to replace vibrated concrete with self-compacting concrete in construction sites. Thus, SCC mixtures containing amounts of fillers were

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Lynda Amel, Chaabane, and Benferrah Rafik. "Olive pomace based lightweight concrete, an experimental approach and contribution." MATEC Web of Conferences 149 (2018): 01068. http://dx.doi.org/10.1051/matecconf/201814901068.

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Due to conventional aggregates resources depletion, material recycling has become an economic and ecologic alternative. In this paper, locally available natural residues such as olive pomace were investigated, when partially incorporated in the concrete formulation, since the mechanical characteristics of lightweight aggregate concrete strongly depend on its properties and proportions. Lightweight aggregates are more deformable than the cement matrix because of their high porosity, and their influence on the concrete strength remains complex. The purpose of this paper is to investigate the agg

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Liu, Wei-Jia, Xu-Jing Niu, Ning Yang, et al. "Prediction Model of Concrete Initial Setting Time Based on Stepwise Regression Analysis." Materials 14, no. 12 (2021): 3201. http://dx.doi.org/10.3390/ma14123201.

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Mass concrete is usually poured in layers. To ensure the interlayer bonding quality of concrete, the lower layer should be kept in a plastic state before the upper layer is added. Ultimately, it will lead to the prediction of concrete setting time as a critical task in concrete pouring. In this experiment, the setting time of concrete in laboratory and field environments was investigated. The equivalent age of concrete at the initial setting was also analyzed based on the maturity theory. Meanwhile, factors affecting the setting time in the field environment were studied by means of multiple s

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Hendrix, Douglas, Jessica McKeon, and Kay Wille. "Behavior of Colloidal Nanosilica in an Ultrahigh Performance Concrete Environment Using Dynamic Light Scattering." Materials 12, no. 12 (2019): 1976. http://dx.doi.org/10.3390/ma12121976.

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The dispersion quality of nanosilica (NS) is an essential parameter to influence and control the material characteristics of nanosilica-enhanced concrete. In this research, the dispersion quality of colloidal nanosilica in simulated concrete environments was investigated using dynamic light scattering. A concrete environment was simulated by creating a synthetic pore solution that mimicked the ionic concentration and pH value of ultrahigh-performance concrete in the fluid state. Four colloidal nanosilica samples were used, ranging in particle sizes from 5 to 75 nm, with differing solid content

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