橡胶集料风积沙混凝土力学性能试验与微观分析

为研究不同橡胶集料取代率对风积沙混凝土力学性能的影响规律，设计、制作10组不同配合比的混凝土试件，通过对各试件进行基本力学性能试验、SEM和EDS测试，对比分析了橡胶集料和风积沙对混凝土力学性能的作用机理，并研究了橡胶集料风积沙混凝土和橡胶集料混凝土2种试件水泥石砂浆界面过渡区的微观结构。研究结果表明，橡胶集料风积沙混凝土和橡胶集料混凝土试件的抗压、抗折、劈裂抗拉强度均随着橡胶集料取代率的增加而降低；折压比随橡胶集料取代率的增加而增加；橡胶的掺入使混凝土的界面过渡区更为薄弱，试件内部呈现出较多微小孔隙，导致混凝土强度的降低。

Test and Microscopic Analysis of Mechanical Properties of Crumb Rubber Aeolian Sand Concrete

In order to study the influence of different rubber aggregate substitution rates on the mechanical properties of aeolian sand concrete,10 groups of concrete specimens with different mix ratios were designed and manufactured. Through basic mechanical properties tests, SEM and EDS testing techniques for each specimen, the mechanism of rubber aggregate and aeolian sand on the mechanical properties of concrete was compared and analyzed.The microstructure of cement mortar interface transition zone of rubber aggregate aeolian sand concrete and rubber aggregate concrete was studied.The results show that the compressive strength, flexural strength and splitting tensile strength of rubber aggregate aeolian sand concrete and rubber aggregate concrete all decrease with the increase of rubber aggregate substitution ratio.The folding ratio increases with the increase of rubber aggregate substitution ratio.The addition of rubber aggregate makes the transition zone of the interface between rubber aggregate and cement mortar unstable, showing more micro pores, which leads to the decrease of concrete strength.