| abstract |
The present invention provides a staircase member having high strength and excellent durability. The present invention relates to (A) cement, (B) silica fume, and (C) inorganic powder having the following characteristics and content, aggregate A having a maximum particle size of 1.2 mm or less, high-performance water reduction It is a step member which consists of a hardening body of the cement composition containing an agent, an antifoamer, and water. (A) Cement: 55 to 65% by volume (B) Silica fume having a BET specific surface area of 15 to 25 m2 / g: 5 to 25% by volume (C) 50% volume Inorganic powder having a cumulative particle size of 0.8 to 5 μm: 15 ~ 35% by volume (however, the total content of cement, silica fume, and inorganic powder is 100% by volume) |