再生混凝土力学性能规律试验研究

Experimental study on basic mechanical properties of recycled concrete

通过13组78块试件测得再生混凝土在不同服役年限不同粗骨料取代率下的应力-应变上升段曲线,分析了服役年限和取代率对RAC破坏形态、抗压强度、弹性模量和峰值应变的影响。研究结果表明:RAC的应力-应变曲线上升段与普通混凝土基本一致,而且破坏过程基本相同,立方体破坏最终呈正倒连接的四角锥形态,棱柱体破坏裂缝与竖直方向的夹角为15°~26°。但是RAC的弹性模量基本小于普通混凝土,取代率为70%时RAC的峰值应变明显小于其他取代率的RAC。

Through 13 set of 78 pieces of specimens measured in different service life of recycled concrete under different coarse aggre- gate content rise stress-strain curve, analyses the service life of and replacement ratio of the recycled aggregate concrete （RAC） failure pat- tern, compressive strength, elastic modulus and peak strain.The results show that the stress-strain curve of RAC and normal concrete, and have the same failure process, cube damage were positively connected four pyramid shape, eventually destroy the cracks of the prismatic specimens and the vertical direction Angle is 15°-26°.But basic less than ordinary concrete, the elastic modulus of RAC when replace rate of 70% of the peak strain of RAC is lower than other RAC.