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为了研究再生混凝土在三轴应力状态下的力学性能,以再生骨料取代率和围压值为变化参数,设计了36个圆柱体试件,采用位移控制的加载方式进行常规三轴试验。通过试验观察了试件的破坏形态,获取试件受力破坏全过程应力-应变曲线以及峰值应力、峰值应变等特征参数,分析了再生骨料取代率和围压值对再生混凝土三轴受压力学性能的影响,提出了侧向围压值与初始弹性模量、竖向峰值应力、峰值应变之间的关系公式。研究结果表明:取代率对三轴受力再生混凝土的峰值应力和峰值应变影响不大,与天然混凝土相比,其变化分别在5%和2%的范围内波动,而取代率对再生混凝土的初始弹性模量有较大的影响,与天然混凝土相比,三轴受力再生混凝土的弹性模量提高了20%左右;侧向围压值对三轴受力再生混凝土的各项性能指标影响显著,增大围压值能有效提高再生混凝土的弹性模量、承载能力和变形性能。研究结果为再生混凝土的进一步科学研究和推广应用提供参考。
In order to study the mechanical properties of recycled concrete under triaxial stress conditions, 36 cylindrical specimens were designed by using the replacement rate and the confining pressure of recycled aggregates as the parameters of variation. Conventional triaxial tests were carried out by using the displacement-controlled loading method. Through the experiment, the failure morphology of the specimen was observed, and the stress-strain curve, peak stress and peak strain of the whole process of stress-strain curve were obtained. The influence of recycled aggregate replacement rate and confining pressure on the triaxial compression of recycled concrete Mechanical properties of the lateral confining pressure and the initial elastic modulus, vertical peak stress, the relationship between the peak strain formula. The results show that the substitution rate has little effect on the peak stress and peak strain of the recycled concrete with triaxial compression. Compared with the natural concrete, the variation of the peak value and the peak value of the recycled concrete fluctuates within 5% and 2% The initial elastic modulus has a greater impact, compared with natural concrete, triaxial reinforced concrete elastic modulus increased by about 20%; lateral confining pressure on the three-axis force of the recycled concrete performance index Significantly, increasing the confining pressure can effectively improve the elastic modulus, bearing capacity and deformation performance of recycled concrete. The results provide reference for further scientific research and popularization and application of recycled concrete.