Mesoscopic Model and Parameter Characterization of Concrete Under Sulfate Attack
Sulfate attack is one of the main factors leading to the damage and deterioration of concrete.The prediction of the temporal and spatial distribution of sulfate ions in concrete is the basis of studying the dam-age and deterioration of concrete.Compared with the macroscopic model,the mesoscopic model can better reflect the actual migration law of sulfate ion in concrete,but there are some problems such as complex modeling and long calculation time.In this paper,concrete was regarded as four composite materials com-posed of cement mortar,interfacial layer,coarse aggregate and macro defects,and a two-dimensional me-soscopic model of concrete was constructed.Then,the effects of macro and mesoscopic models on numeri-cal simulation were studied and compared,and mesoscopic parameters were defined to make the macro-scopic model achieve the simulation effect of the mesoscopic model.The results showed that:1)the influ-ence of mesoscopic model randomness on sulfate ion diffusion could be eliminated by taking the average val-ue of multiple models;2)the increase of stone content was accompanied by the deepening of erosion depth and the decrease of sulfate ion concentration at the same location,and this phenomenon was more obvious with the increase of depth;3)the mesoscopic parameters increased with the increase of stone content.
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