超声测试技术在钢纤维砼试验中的应用

Application of Ultrasonic Testing in Experiments of Steel Fibre Concrete

利用超声测试技术，进行了８ 组共计４８ 个普通砼及钢纤维砼试件的力学性能试验．通过对试件裂缝的出现、发展及试件破坏过程的测试，获得了超声波在普通砼和钢纤维砼中传播的各种声学参数．利用所测得的超声波穿过砼试件的传播时间及首波振幅衰减量，分析讨论了砼强度和钢纤维含量对声学参数的影响，并在此基础上对普通砼及钢纤维砼的力学性能进行了综合分析．结果表明，钢纤维砼的抗裂、抗拉等力学性能明显优于普通砼．

Through the experiments of 48 samples subjected to unidirectional load by ultrasonic test,various acoustic parameters of ultrasonic transmitting in concrete and reinforced fibre concrete are obtained.The influence of the concrete strength and the ration of steel fiber on the acoustic parameters are discussed and the mechanical behavior of concrete is analyzed comprehensively.The results show that the mechanical behavior of steel fibre reinforced concrete is better than that of concrete.