Adding polyacrylamide to cement mortar, polyacrylamide particles can fill the hole, and polyacrylamide film can also close the hole, so polyacrylamide is an effective way to solve the impermeability problem of ordinary concrete and cement mortar, And polyacrylamide can significantly improve the fluidity of cement-based materials, water retention, bonding with the base material, water tightness, durability, chemical corrosion resistance, freeze-thaw resistance and mechanical s...