The addition of nano SiO2 powder as an admixture to cement-based materials can improve many of the properties of cement-based materials. A large number of research results show that adding appropriate amount of SiO2 nanopowder to cement-based materials, due to the volcanic ash effect of nano SiO2 particle , nucleation effect and micro-filling effect, can significantly improve the early strength of cement-based materials, improve the bleeding of cement-based materials and The pore distribution characteristics improve the durability of the structure. 1. Effect of nano-SiO2 on properties of cement-based materials 1.1The nano-SiO2 has a small particle size, so the specific surface area is large and the surface activity is high, so that a part of the free water of the cement-based material slurry is consumed in the early stage of the cement-based material curing age. In addition, since nano-SiO2 is too small in particle size, it is almost difficult to unifor...
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