The interfacial transition zone of cement-based materials modified by nano silica has been greatly improved, and the impermeability has been improved [14-16]. This mainly depends on the nucleation effect of nano silica [17] and secondary hydration reaction, which consumes calcium hydroxide in the system and generates additional hydrated calcium silicate, which not only improves the compressive strength, but also refines the pore structure, and finally improves the durability [12, 13]<br>
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