The study on the nonclassical nonlinear effect of concretes with different mix rate

The mix rate of concrete has great influence on the strength of concrete. At present, research method on different mix rate of concrete is always mechanical rather than acoustical. Different mix rates have different porosities in concretes and their linear and nonlinear acoustic properties of concrete are also different. In this paper, the porosity, the linear and nonlinear acoustic properties such as sound velocity, harmonics, nonlinear frequency shift of the concrete samples are compared. And we explore the possibility of using the linear and nonlinear parameters to characterize the strength of concrete.