Residue strength, water absorption and pore size distributions of recycled aggregate concrete after exposure to elevated temperatures

Kou, Shi Cong; Poon, Chi Sun; Etxeberria, Miren

doi:10.1016/j.cemconcomp.2014.06.001

Cited by 112 publications

(35 citation statements)

References 31 publications

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“…The specimens for comparison are all cubes, and finally, the center of the specimens can reach the target temperature. Similar trend in the compressive strength reduction was reported by several authors . Some discrepancies are observed after exposure to 300°C mainly because of the different degrees of CSH rehydration.…”

Section: Resultssupporting

confidence: 88%

“…Figure compares the results of RCS of coarse NA concrete and coarse RCA concrete with the results of this study under natural cooling. The specimens for comparison are all cubes, and finally, the center of the specimens can reach the target temperature.…”

Section: Resultsmentioning

confidence: 74%

“…This improved mechanical performance in coarse RCA concrete can be attributed to similar thermal expansion coefficients between the new and adhered mortar in the coarse RCA. In later studies, Xiao and Zhang, 16 Xiao et al, 17 Kou et al, 18 and Sarhat and Shewood 19 reported similar findings, indicating that coarse RCA concrete has a higher residual strength than coarse NA concrete. For instance, the relative compressive strength of concrete with 100% coarse RCA is 4% to 32% higher than that of coarse NA concrete when subjected to 500°C.…”

Section: Introductionmentioning

confidence: 79%

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Residual cube strength of coarse RCA concrete after exposure to elevated temperatures

2018

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Summary An experimental investigation was carried on the residual cube strength of concrete made with coarse recycled concrete aggregate (RCA) after exposure to temperatures of 20°C to 800°C. A total of 360 cube specimens were made with 2 water/cement ratios (w/c = 0.31 and 0.45) and 5 replacement percentages (r = 0%, 25%, 50%, 75%, and 100%) of coarse RCA. Effects of different cooling regimes (natural cooling, water cooling) on the residual compressive strength of coarse RCA concrete after exposure were also investigated. Experimental results show that the cube compressive strength and splitting tensile strength of coarse RCA concrete diminish with increasing temperature, of which the splitting tensile strength declines quicker than the compressive strength. The effects of coarse RCA replacement percentage and w/c ratio on losses in relative strength after being exposed to high temperatures are found to be insignificant. The results also reveal that the relative compressive strength of coarse RCA concrete cooled in water after heating process is lower than that of specimens cooled naturally.

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Section: Resultssupporting

confidence: 88%

Section: Resultsmentioning

confidence: 74%

Section: Introductionmentioning

confidence: 79%

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Residual cube strength of coarse RCA concrete after exposure to elevated temperatures

2018

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“…As temperature increased, the thermal diffusivity of sacrificial concrete in the range of 25-600 ºC decreased, which can be attributed to the evaporation of water, decomposition of hydrates and thermal cracks induced by high temperatures. These explanations have been already identified by previous studies [30,49,52]. When the temperature was higher than 600 ºC, the microstructure of sacrificial concrete was further deteriorated (see Fig.…”

Section: Thermal Diffusivitysupporting

confidence: 67%

“…In case of fire or nuclear accident, concrete is exposed to elevated temperatures. Although extensive research on the behaviour of concrete subjected to high temperatures has been reported so far [30][31][32][33][34], investigation on the thermal properties of sacrificial concrete is rare, especially on its mechanical properties during elevated temperature exposure. Chu et al [35] have recently carried out a systematic study on mechanical and physicochemical properties of ferro-siliceous sacrificial concrete after high temperature exposure, and observed that the compressive strength-ultrasonic pulse velocity (UPV) and splitting tensile strength-UPV relationships followed a Weibull distribution and was in exponential form, respectively.…”

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confidence: 99%

Mechanical and thermal properties of graphene sulfonate nanosheet reinforced sacrificial concrete at elevated temperatures

Chu

Sun

Zhang

2017

Construction and Building Materials

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Progress in the field of nanomaterials presents an opportunity to improve the performance of cementitious composites via graphene or its derivatives. This paper presents an experimental study on mechanical and thermal properties of sacrificial concrete without and with graphene sulfonate nanosheets (GSNSs) during high temperature exposure. The microstructure, porosity, mechanical strengths, thermal analysis, coefficient of thermal expansion, thermal diffusivity and ablation behaviour of sacrificial concrete during exposure to various temperatures up to 1000 ºC were comprehensively investigated. Two new experimental apparatuses were developed and used to measure mechanical strengths of sacrificial concrete at elevated temperatures. It was found that the compressive strength, splitting tensile strength, thermal diffusivity and decomposition enthalpy of sacrificial concrete were increased by 12. 98-25.36%, 8.66-34.38%, 25.00-103.23% and 4.23% respectively when adding 0.1 wt% GSNSs, while the porosity and ablation velocity of sacrificial concrete were reduced by 3.01-6.99% and 4.14% respectively due to the incorporation of GSNSs.

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Experimental and numerical analysis of the thermal and mechanical behaviour of steel and recycled aggregate concrete composite elements exposed to fire

et al. 2022

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Using recycled aggregates in the production of concrete has been a viable alternative for sustainable development. Notwithstanding advanced information on this material at room temperature, its behavior when exposed to fire is still incipient. Thus, based on experimental analyses, the objective of this article is to evaluate the behavior of concrete produced with recycled aggregates for thermal insulation of steel elements, as well as to verify the physical and mechanical properties of these mixtures. For this purpose, eight prototypes, one made of steel and the others coated with different types of concrete, conventional and with recycled aggregates, were inserted in a horizontal oven and heated for 2 h. Based on experimental tests, numerical models were proposed and tested using the ABAQUS computational code, with consistent results when coherent thermal properties were adopted. The experimental results show that recycled aggregate concrete (RAC) has great thermal insulation potential and sustainable benefits, considering that the steel elements coated with this type of material, with the exception of those that underwent spalling, presented temperatures close to or below compared with concrete with natural aggregates. In this regard, it is observed that the thermal conductivity of RACs was inferior to conventional concrete, indicating that this material is a promising strategy for thermal insulation of steel structures.

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Residue strength, water absorption and pore size distributions of recycled aggregate concrete after exposure to elevated temperatures

Cited by 112 publications

References 31 publications

Residual cube strength of coarse RCA concrete after exposure to elevated temperatures

Residual cube strength of coarse RCA concrete after exposure to elevated temperatures

Mechanical and thermal properties of graphene sulfonate nanosheet reinforced sacrificial concrete at elevated temperatures

Experimental and numerical analysis of the thermal and mechanical behaviour of steel and recycled aggregate concrete composite elements exposed to fire

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