| abstract |
(57) [Summary] [Purpose] Mainly used in the field of civil engineering and construction, To provide a cement composition capable of ensuring slump retention for a certain period of time and obtaining concrete having good initial strength development, particularly good strength development at low temperatures, and a cast-in-place lining method using the same. [Constitution] 3CaO / SiO 2 content of 60% by weight or more Portland cement, anhydrous gypsum, formic acid, water reducing agent, cement composition containing fine silica powder as required, and concrete containing it A cast-in-place lining method is used in which the mold is moved, the mold is moved, and the joint is performed. |