基于超声波技术的PVA-DSECC材料无损检测研究

Research on Nondestructive Testing of PVA-DSECC Materials Based on Ultrasonic Technology

摘要: 为了探究沙漠砂制备工程水泥基复合材料(简称PVA-DSECC)超声波速影响因素及其与强度的关系，采用超声回弹综合法，设计了不同水胶比、砂胶比、沙漠砂替代率、龄期的单轴抗压强度试验与超声无损检测试验，分析了6种水胶比、3种砂胶比、4种沙漠砂替代率、2种龄期对PVA-DSECC超声波速的影响，同时通过线性拟合确定不同龄期、不同配合比情况下超声波速与PVA-DSECC抗压强度关系式。试验结果表明：水胶比、砂胶比、沙漠砂替代率、龄期都不同程度地影响着PVA-DSECC的超声无损检测波速，其中，水胶比、龄期影响最为显著；砂胶比、沙漠砂替代率影响较小；线性拟合得出超声波速与抗压强度关系表达式，相关系数为0.85，可靠性较好。

Abstract: In order to explore the influence factors of ultrasonic velocity and its relationship with the strength of desert sand preparation Engineered Cementitious Composite (ECC), ultrasonic mixing method was used to design different water-to-binder ratio, sand-to-binder ratio, desert sand replacement rate and age. The uniaxial compressive strength test and the ultrasonic non-destructive testing test analyzed the effects of six water-to-binder ratios, three sand-to-binder ratios, four desert sand replacement rates, and two ages on the desert sand Engineered Cementitious Composite (PVA-DSECC) ultrasonic velocity. The relationship between ultrasonic velocity and PVA-DSECC compressive strength at different ages and different mix ratios is determined. The test results show that the water-to-binder ratio, sand-to-binder ratio, desert sand replacement rate and age have different degrees of influence on the ultrasonic non-destructive testing wave velocity of PVA-DSECC. Among them, the water-to-binder ratio and the age are the most significant; the sand-to-gel ratio and the desert sand substitution rate have little effect; linear expression is used to obtain the expression of the relationship between ultrasonic speed and compressive strength. The correlation coefficient is 0.85 and the reliability is good.