C30再生混凝土变形性能及应力-应变曲线试验研究

Experimental research on deformation properties and stress-strain curve of C30 recycled concrete

基于JGJ55—2000《普通混凝土配合比设计规程》下C30强度混凝土的配合比设计方法,以3个水灰比和5个取代率为变化参数,测试了C30再生混凝土立方体抗压强度、棱柱体轴心抗压强度和弹性模量等力学指标,并回归得出力学指标之间的换算关系;分析了棱柱体受压试件的应力-应变曲线和应力比-泊松比曲线的变化规律;最后给出适用于C30再生混凝土的应力-应变曲线上升段的回归公式。

Based on the strength of C30 concrete mix proportion design methods of ＂Specification for Mix Proportion Design of Ordinary Concrete＂（JGJ 55-2000 ）, we set up three water-cement ratio and five replacement of recycled aggregate as the change parameters.Test the cube compressive strength, Axial compressive strength of prism and elastic modulus of C30 recycled concrete Using regression analysis,the conversion relationship between the mechanical indicators were established.At the same time, analyzed the stress-strain curves and stress ratio-poisson＇s ratio curves changes in the law.Finally,the regression formula of stress-strain curves which applicable to C30 recycled concrete was showed.