Residual compressive stress-strain relation of recycled aggregate concrete after exposure to high temperatures

Yang, Haifeng; Lv, Liangsheng; Deng, Zigang; Lan, Wenwu

doi:10.1002/suco.201500153

Cited by 31 publications

(5 citation statements)

References 21 publications

(52 reference statements)

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“…The ratios between residual compressive strength for different elevated temperature conditions

f_{cu}^{T}

and the corresponding strength at ambient temperature

f_{cu}^{20}

are shown in Figure 4a. It can be founded clearly that the compressive strength decreases continuously as the temperature increases, which is consistent with experimental results previously reported by Xiao et al, 27 Yang et al, 47 Laneyrie et al, 28 and Zhao et al, 48 In addition, the compressive strength decrease rate are 9.4–28.2, 13.87–25.39, 5.44–24.39, and 9.6%–15.36% at 0%, 30%, 70%, and 100% RA content, respectively, indicating that the decrease rate becomes slower as the temperature increased. Causes for the result might be owed to its replacement by RA, which incorporates more additional water, reducing the strength loss after exposure to high temperatures.…”

Section: Basic Mechanical Propertiessupporting

confidence: 92%

“…Due to the multi-interface of RAC and the initial damage of aggregate, the research into the mechanical properties of RAC after the high temperature is more complicated than that of NAC. So far, although the mechanical properties of RAC, such as compressive strength, [26][27][28][29][30][31] splitting tensile strength, 32,33 shear strength, 34 and the constitutive relation of stressstrain, [35][36][37][38][39][40] after being exposed to elevated temperatures have been widely studied, the G F of RAC after being exposed to high temperature has hardly been studied. According to the literature review, only a little information in Guo's 41 and Wang's 42 literature was found about the G F of RAC after exposure to elevated temperature, and the results show that the G F of full replacement by RA of concrete (RAC100) increased with the increase of temperature.…”

Section: Introductionmentioning

confidence: 99%

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Residual fracture energy of natural and recycled aggregate concrete after exposure to high temperatures

Chen

Peng

Yang

et al. 2022

Structural Concrete

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Fracture energy (GF) represents the average total energy consumed in the whole process of crack propagation. Using one parameter of GF, it is not sufficient to describe the fracture behavior during crack stable and unstable propagation periods. In this study, the GF, stable fracture energy (GFS) and unstable fracture energy (GFU) of natural and recycled aggregate concrete (RAC) were investigated by using three‐point bending tests. Totally, 128 cubic specimens (100 mm × 100 mm × 100 mm) and 64 notched beams with size of 510 mm × 100 mm × 100 mm were manufactured to test the compressive strength (fcu), splitting tensile strength (ft), load–deflection (P‐δ), and load‐cracking mouth opening displacement (P‐CMOD) curves, considering different replacement levels (0%, 30%, 70%, and 100%) of recycled coarse aggregate (RA) and high temperatures exposure (20, 100, 200, and 300°C). The effects of RA substitutions and temperatures on basic mechanical properties, GF, GFS, and GFU were analyzed. The results demonstrated that the fcu, ft, and elastic modulus (E) decreased with the incremental temperature. The GFS of concrete with different RA substitutions first decreased and then increased, and the minimum value appeared at 200°C. The GF and GFU of concrete with different RA substitutions increased with the elevated temperature, and the increase rate decreased with RA substitutions. When the temperature is less than 100°C, the GF and GFU of concrete remained mostly unchanged with the increase of RA substitutions, while the temperature reached 200 and 300°C, the GF and GFU of concrete increased and decreased with the increase of RA substitutions, respectively.

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“…The ratios between residual compressive strength for different elevated temperature conditions

f_{cu}^{T}

and the corresponding strength at ambient temperature

f_{cu}^{20}

Section: Basic Mechanical Propertiessupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Residual fracture energy of natural and recycled aggregate concrete after exposure to high temperatures

Chen

Peng

Yang

et al. 2022

Structural Concrete

Self Cite

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“…After exposure to temperatures of 400°C, 600°C, and 800°C, the strengths of both coarse NA and RCA concretes decreased by the same magnitudes of 22%, 25%, and 40%, respectively. In the following works, Zhao et al and Yang et al observed similar results based on the compressive stress‐strain curves of coarse RCA concrete after high‐temperature exposure. It showed that the residual compressive strength of coarse RCA concrete was only marginally affected by the coarse RCA content.…”

Section: Introductionmentioning

confidence: 52%

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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“…When the LS was 20%, it increased by 7.39%, 10.84%, and 16.26% respectively; when the LS was 40%, it increased by 4.60%, 12.07%, and 21.26%, respectively. This may be because as the RFA substitution rate increased, the cement base adhered to the aggregate surface increased, so that the actual gel content of the RFA concrete increased after solidification, so its peak strain increased [52,56]. When only considering the effect of LS content on the peak strain of concrete, LS10 and LS20 increased by 1.97% and 5.91% compared with the reference group [46,51]; while LS40 decreased by 14.29% compared with the reference group.…”

Section: Peak Strainmentioning

confidence: 99%

Compression stress-strain curve of lithium slag recycled fine aggregate concrete

Chen,

Liang,

2024

PLoS ONE

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As one of the key materials used in the civil engineering industry, concrete has a global annual consumption of approximately 10 billion tons. Cement and fine aggregate are the main raw materials of concrete, and their production causes certain harm to the environment. As one of the countries with the largest production of industrial solid waste, China needs to handle solid waste properly. Researchers have proposed to use them as raw materials for concrete. In this paper, the effects of different lithium slag (LS) contents (0%, 10%, 20%, 40%) and different substitution rates of recycled fine aggregates (RFA) (0%, 10%, 20%, 30%) on the axial compressive strength and stress-strain curve of concrete are discussed. The results show that the axial compressive strength, elastic modulus, and peak strain of concrete can increase first and then decrease when LS is added, and the optimal is reached when the LS content is 20%. With the increase of the substitution rate of RFA, the axial compressive strength and elastic modulus of concrete decrease, but the peak strain increases. The appropriate amount of LS can make up for the mechanical defects caused by the addition of RFA to concrete. Based on the test data, the stress-strain curve relationship of lithium slag recycled fine aggregate concrete is proposed, which has a high degree of agreement compared with the test results, which can provide a reference for practical engineering applications. In this study, LS and RFA are innovatively applied to concrete, which provides a new way for the harmless utilization of solid waste and is of great significance for the control of environmental pollution and resource reuse.

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Residual compressive stress-strain relation of recycled aggregate concrete after exposure to high temperatures

Cited by 31 publications

References 21 publications

Residual fracture energy of natural and recycled aggregate concrete after exposure to high temperatures

Residual fracture energy of natural and recycled aggregate concrete after exposure to high temperatures

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

Compression stress-strain curve of lithium slag recycled fine aggregate concrete

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