The effect of compound silicate and silane on the durability of concrete.

The influence of surface treatment with compound silicates and silicate/silane composite system on durability of concrete with different strength was studied. SEM and FTIR were used to explore the mechanism of surface treatment. The enhancement effects were compared by anti-chloride ion, carbonization resistance and freeze-thaw resistance tests. The results show that the enhancement effects of silicate/ silane composite treatment are better than that of compound silicates alone, and the improvements effect is more obvious with decrease of concrete grade. Compared with untreated concrete,the 6 h electricity flux of C50 concrete has decreased by 10. 0%, C40 concrete by 14. 4%, and C30 concrete by 29. 4%. Mean-while,the carbonization depth has also decreased from 12. 1% of C50 to 23. 8% of C40 and 33. 0% of C30. At the same time,using silicate/silane composite for concrete surface treatment can effectively improve the number of freeze-thaw cycle,reduce the mass loss rate,and endow the concrete with better durability. [ABSTRACT FROM AUTHOR]