... 2,Manufacture of high permeability (≥ P30), waterproof concrete structure for the MTR, tunnels, the basement of high-rise buildings; ... erosion resistance is very demanding, micro-doped silica fume is necessary; 5,micro-silica fume strong activity, a caustic water properties, ... -scale structure in the course of construction Pit Support for the high-strength concrete plus jet ; underwater construction ...