The mechanical properties of recycled aggregate concrete under multiaxial compression were tested by servo-controlled setup (TAWZ-5000/3000). Properties of strength and stress–strain relation were obtained, and the influence factors of stress ratio and recycled coarse aggregate replacement ratio were analyzed. The results show that the strength of recycled aggregate concrete under multiaxial compression is higher than that of under uniaxial state, the stress ratio and recycled coarse aggregate replacement ratio have obvious effect on strength, and the shape of stress–strain curve is also varied with different levels of the two factors. Failure criterion can reflect the strength relation for recycled concrete under multiaxial stress state. Kupfer’s failure criterion is selected to describe strength properties under biaxial stress state, and the failure envelope reflects the energy absorption of different mix series. Based on octahedral stress theory, the tensile and compressive meridians have been proposed to analyze the strength characteristics under triaxial compression, and the theoretical values are well coherent with the test data.

中文翻译：

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再生骨料混凝土多轴受压力学性能

通过伺服控制装置（TAWZ-5000/3000）测试再生骨料混凝土在多轴压缩下的力学性能。获得了强度特性和应力应变关系，分析了应力比和再生粗骨料置换率的影响因素。结果表明，再生骨料混凝土在多轴受压状态下的强度高于单轴状态下的强度，应力比和再生粗骨料替代率对强度的影响明显，应力-应变曲线的形状也随不同的应力而变化。两个因素的水平。破坏准则可以反映再生混凝土在多轴应力状态下的强度关系。选用 Kupfer 破坏准则来描述双轴应力状态下的强度特性，失效包络反映了不同混合系列的能量吸收。基于八面体应力理论，提出了拉伸和压缩子午线分析三轴压缩下的强度特性，理论值与试验数据吻合较好。