Study of the influence of aggregate size distribution on mechanical properties of concrete by acoustic emission technique

摘要

Acoustic emission (AE) has been widely used in concrete research as a dynamic nondestructive test method. In this study, the AE characteristics of concrete with different aggregate size distributions under uniaxial compression and three-point-bending were studied. Parameters such as maximum aggregate size, compressive strain and fracture energies of different concretes were also measured and discussed. The test results show that the characteristics of AE signals from concrete can illustrate the failure process in both compression and three-point-bending. The fracture energy increases with increment of the maximum aggregate size. Moreover, there is a good relationship between AE hits and fracture energy.