Abstract
With TEOS and MTES as precursors,nano-silicone permeable protective coating of marine concrete was prepared by acid/base two-step sol gel method where hydrochloric acid catalyzed silica sol was dropped into proportionally ammonia catalyzed base silica sol.The structure and properties of the coating were characterized by TEM,SEM,water absorption,chloride ion passed charge.The results show that for core-shell structure of SiO2sol prepared by acid/base two-step,dot-pits were observed on the treated mortar sample surfaces,penetration depth of mixed sol coated mortars was 1.3 mm,4 h water absorption of mortar samples were lower than 85% or more,6h chloride ion passed charge of concrete samples reduced by 50% or more.
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