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

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。

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.