Self-healing action of permeable crystalline coating on pores and cracks in cement-based materials

The self-healing action of a permeable crystalline coating on the porous mortar was investigated by two times impermeability test. Moreover, the self-healing mechanism, of cement-based materials with the permeable crystalline coating was studied by, SEM. The results indicate that the permeable crystalline coating flat not seals the pores and cracks, in mortar during its curing process, but also heals the permeable pathway caused by first impermeability test or cracks produced by freeze-thaw cycles. Therefore, cement-based materials can be improved by the permeable crystalline coating,for the self-healing function. SEM images prove that the self-healing function is realized by generating a great quantity of non-soluble dendritic crystalline within the pores and crack's I which, prevents the penetration of water and other liquids.