ultrasonic testing;  concrete;  Steel fiber concrete

Using ultrasonic testing technology, the mechanical properties of 8 groups of 48 ordinary concrete and steel fiber concrete specimens were tested. Through the test of the occurrence and development of cracks in the specimen and the failure process of the specimen, various acoustic parameters of ultrasonic propagation in ordinary concrete and steel fiber concrete were obtained, and the propagation time and first wave amplitude attenuation of ultrasonic waves through the concrete specimen were obtained, and the influence of concrete strength and steel fiber content on acoustic parameters was analyzed and discussed, and the mechanical properties of ordinary concrete and steel fiber concrete were comprehensively analyzed on this basis. The results show that the mechanical properties of steel fiber concrete such as crack resistance and tensile resistance are significantly better than ordinary concrete