摘要：From a mesoscopic view, recycled concrete (RC) can be taken as a multi-phase composition which is consisted of aggregate, mortar and the interface between them. The three-dimensional grading curve of aggregate is determined by referring to the Fuller curve. And with the Monte Carlo method, the meso-sample of RC can be developed randomly. By the gradually mesh generation method, the randomly distributed aggregates, interfaces and mortar are meshed in turn. Finally, with the meso finite element model just generated, when the recycled aggregate (RA) mixing proportion is 0%,40%,70% and 100%，the numerical uniaxial compression fracture experiments of the RC specimen are carried out respectively. And the damage distribution and evolution processes are simulated and tracked. As the simulation results demonstrate, the damage appearance of cylinder specimen belongs to oblique section damage which gradually grows with the increment of displacement. Meanwhile, the damage region spreads to both sides of the oblique section which corresponds to the CT scanning pictures. Observed from the stress-strain diagram of numerical simulation and servo test, as the RA content increases, the peak strength decreases and so does the slope, which means the compression elastic modulus becomes smaller and agrees with the fact that the mixture of RA leads to the softening of inner structure.
