再生粗骨料自密实混凝土基本力学性能

通过再生粗骨料自密实混凝土(RCASCC)的工作性能、立方体抗压强度、劈裂抗拉强度、轴心抗压强度测试和应力应变试验,分析了不同再生粗骨料取代率(R)下RCASCC的工作性能和基本力学性能的变化规律,并提出了RCASCC的应力应变本构方程.结果表明：随着R的增加,RCASCC的工作性能变差,但仍能满足现行规范要求;随着R的增加,RCASCC的立方体抗压强度、轴心抗压强度、劈裂抗拉强度总体呈现下降趋势,但R=50%时的立方体抗压强度和轴心抗压强度要高于R=25%之时;随着龄期的增长,RCASCC的抗压强度呈现非线性增长的趋势;经验证,所得出的RCASCC轴心抗压强度、劈裂抗拉强度与立方体抗压强度之间的换算关系与普通混凝土换算关系基本一致，RCASCC的应力应变本构方程与普通混凝土的单轴受压本构方程相近.

Basic Mechanical Properties of Recycled Coarse Aggregate Self compacting Concrete

Through the working performance, cubic compressive strength, splitting tensile strength, axial compressive strength and stress strain tests of recycled coarse aggregate self compacting concrete(RCASCC), the changes of working performance and basic mechanical properties under different replacement rates of recycled coarse aggregate were analyzed. The stress strain constitutive equation of the RCASCC was put forward. The results show that with the increase of replacement rate of recycled coarse aggregate, the working performance of RCASCC becomes worse, but still can meet the current standard requirements; with the increase of replacement rate, the cubic compressive strength, axial compressive strength and splitting tensile strength of RCASCC are generally decreased, but when the replacement rate is 50%, the cubic compressive strength and axial compressive strength are higher than that for the replacement rate is 25%; the compressive strength of RCASCC shows a nonlinear growth trend with the increase of age. The conversion relations between the axial compressive strength, splitting tensile strength and cubic compressive strength of RCASCC and those of ordinary concrete is in agreement, the stress strain constitutive equation of RCASCC is similar to the single axis compression constitutive equation of ordinary concrete.