Compressive stress–strain relationship of steel fiber-reinforced reactive powder concrete after exposure to elevated temperatures
Compressive stress–strain relationship of steel fiber-reinforced reactive powder concrete after exposure to elevated temperatures
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DOI：
10.1016/j.conbuildmat.2012.05.031
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发表时间：
2012-10
影响因子：
7.4
通讯作者：
W. Zheng;Haiyan Li;Ying Wang
中科院分区：
文献类型：
--
作者：
W. Zheng;Haiyan Li;Ying Wang
对不同钢纤维掺量的活性粉末混凝土（RPC）在20-900°C高温下的全压应力-应变关系进行了试验研究。钢纤维体积掺量为1%、2%和3%。结果表明：RPC的抗压强度和弹性模量随着温度的升高先增大后减小，弹性模量的损失比抗压强度的损失快。峰值应变和极限应变分别在600°C和700°C时达到峰值，峰值前呈指数增长，峰值后呈线性下降。基于试验结果，提出了适用于未加热和加热RPC的压缩应力-应变本构方程，为今后的工业应用和设计提供了有价值的参考。
An experimental research is performed on the complete compressive stress–strain relationships for reactive powder concrete (RPC) with various steel fiber contents after exposure to 20–900°C. The steel fiber volume dosage is 1%, 2% and 3%. The results indicate that the compressive strength and elastic modulus of RPC increase at first, then decrease with the increasing temperature, and the loss of elastic modulus is quicker than the compressive strength. The peak strain and ultimate strain reach peaks at 600°C and 700°C respectively, and they increase exponentially before the peak points, but decrease linearly after the peak points. Based on the experiment results, the compressive stress–strain constitutive equations applicable to the unheated and heated RPC are proposed, which provide a valuable reference for future industrial applications and design.