The Combined Aggregate Mechanical Properties Of Concrete Numerical Simulation Study

As a new material, mixed aggregate concrete overcome the shortcoming of concrete self-respect and big brittleness. It also overcome the shortcoming of lightweight aggregate concrete's low elastic modulus and big deformation. Through the adjustment of aggregate admixture, the mixed aggregate concrete can have the premise of satisfying the intensity with better economic performance. Meanwhile, the concrete is inhomogeneous composite materials with the complex internal structure. The macroscopic mechanical model of concrete presumed the concrete as an idealized homogeneous material. However, this hypothesis is hard to study the concrete's whole process of destruction of the crack's formation, expansion and penetration. This paper studied the damage process of mixed aggregate concrete and the macroscopic mechanical properties in the angle of mesoscopic levels.This paper mainly includes the failure process and mechanical properties of the mixed aggregate under the uniaxial compression condition. The main content and the conclusions are as follows:(1) This paper regard the mixing aggregate concrete as three-dimensional composite materials composed by lightweight aggregate, ordinary aggregate and mortar in microscopic structure level. It got the program by using the APDL programming language which is the AN SYS's own language. Then it generated the mix aggregate concrete two-dimensional random aggregate structure. And the aggregate radius and position are randomly distributed. It separately divided the grid on lightweight aggregate, ordinary aggregate and mortar meshing by using the Boolean operation, and then combined the grid.(2) After the uniaxial compression numerical simulation on lightweight aggregate replacement rate of different mix of aggregate concrete situation, it got the mixing aggregate concrete pressure of the whole process of destruction. This can provides the basis for the macroscopic strength analysis of the mixed aggregate concrete.(3) Through the uniaxial compression numerical simulation of different light weight aggregate replacement rate and different water cement ratio case of mixed aggregate concrete, it studied its influences of mixed aggregate concrete compressive strength and elastic modulus. In certain circumstances of water cement ratio, it used the methods of uniaxial compression numerical simulation on the different light weight aggregate replacement rate and different light weight aggregate strength to studied its influences of mixed aggregate concrete compressive strength and elastic modulus.