Effect of silica sol-isobutyltriethoxysilane composite emulsion on waterproof performance of foam concrete
[Introduction]The effect of silica sol-isobutyltriethoxysilane(IBTS)composite emulsion on the waterproof performance of foam concrete was studied to provide experimental data for broadening its application.[Method]The protection effect of the composite emulsion on foam concrete was comprehensively analyzed by macroscopic mechanical property testing and microstructure characterization.[Result]The foam concrete coated with the composite emulsion showed better impermeability and durability than that coated with only IBTS emulsion due to the fact that the former had a less depth of water penetration and carbonation,a water absorption rate of 0.46%after 48 hours of immersion in water,and a chloride ion migration coefficient of 1.1×10-12 m2/s.In addition,it lost only 0.55%of weight and maintained 85.34%of dynamic elastic modulus after 240 cycles of freezing/thawing test.[Conclusion]The waterproof mechanism of the composite emulsion involves many aspects such as surface effect,chemical reaction,and physical effect.Water penetration and diffusion through foam concrete are prevented after coating with the composite emulsion by forming a compact waterproof layer,filling pores and microcracks,as well as adsorbing and encapsulating water molecules.Therefore,the waterproof performance of foam concrete is improved.
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