要約

In the previous paper, concrete was considered as a three-phase composite material consisting of aggregates, interfacial area, and mortar, and the random delivery model of aggregates in concrete was established by MATLAB software. In the paper, the model is introduced into COMSOL, and the effect of different aggregate contents and volume fractions of the interface on the diffusion of chloride ions is discussed. By means of design of experiment, the repeatability of the proposed model is verified and simulation precision is confirmed. The effectiveness of the model is tested by a comparative analysis of experimental data and simulated results. The simulation results show that the diffusion performance of chloride ions is restrained by the increase in the content of aggregates, which is manifested by a zigzag effect of the aggregate; the performance of the diffusion of chloride ions is accelerated with increase in the interfacial area, which is assumed as interfacial effect. From the simulated profiles, it can be seen that the acceleration becomes more obvious with increase of the content of aggregates.