Study the effect of nano SiO2 prepared from rice husk ash on the chloride resistance of cement concrete

Abstract

    Nano-SiO2 prepared from rice husk ash (large specific surface area 258.3 m2 /g, particle size 10 to 15 nm) increased the chloride resistance of cement concrete. The ability to resist chloride penetration increases with the content of nano-SiO2 used. When nano-SiO2 content used is 2.5%, the chloride ion-resistance ability of concrete is the best, 30.4% reduction of charge passed for grade M60 and 26% reduction for grade M70 compared to concrete not using nano-SiO2.