高温后再生混凝土应力-应变曲线研究

Study on stress-strain curve of recycled aggregate concrete after exposure to elevated temperatures

完成了高温对不同替代率再生混凝土的强度及受压应力-应变关系曲线影响的试验研究。研究结果表明:再生混凝土的受压强度、弹性模量随着温度的升高而明显下降,其峰值应变随着温度的升高而不断增加。基于试验结果,给出了高温后再生混凝土的应力-应变关系式,并与试验结果吻合较好。

It presents the effect of high temperature on the strength and compressive stress-strain curves of recycled coarse aggregate concrete with different replacement rates by experimental test.The results showed that the compressive strength,and modulus of elasticity of the recycled aggregate concrete specimens decreased significantly with the increase of temperature.And the peak strain of the recycled coarse aggregate concrete specimens increased with the increase of temperature.Based on the test results,the stress-strain relationship formula of recycled coarse concrete after high temperature was given,which was in good agreement with the test results.