Introduction of a multi-scale chemo-physical simulation model of ASR

The alkali silica reaction (ASR) in concrete evolves at different scales. The chemical reaction happens on micro scale between the pore solution and reactive aggregate in concrete, and results in expansion and cracking from cement paste micro to concrete macro scale. However, the present models either focus on the chemical reaction mechanism or on the physical expansion at different scales. A comprehensive integrated multiscale model, which will be able to bridge the chemical reaction and the physical expansion, is urgently needed to better understand and prevent ASR. This paper outlines an introduction to achieve such a model. Coupling the transportation model (LBM), the proposed model is able to simulate the whole chemical reaction evolution process of ASR; it starts from the dissolution of reactive aggregate and cement, to the nucleus formation and to the growth of reaction products. Mechanical properties of these products can be then determined. Combining the already developed lattice model, the cracking patterns can be simulated in concrete. Experimental studies or sample data from present literature can be used to increase the reliability of such a prediction model. Final integrated model can provide guidelines for engineers on a full scale ASR potential evaluation and more reliable prevention design of newly built structures.