| 摘要 |
PROBLEM TO BE SOLVED: To obtain a cement composition that has excellent workability, durability and the like by preparing a cement composition including graphite, a cement- dispersing agent and/or a graphite-dispersing agent. SOLUTION: The objective cement composition comprises graphite (naturally occurring one or artificial one, having a diameter of <=40 mm), a cement- dispersing agent and/or a graphite-dispersing agent. The cement dispersant preferably has polyoxyalkylene units in its molecular structure and is used in an amount 0.01-1 pt.wt. per 100 pts.wt. of the cement on the solid basis. The graphite dispersant is preferably a cationic surface active agent and/or a nonionic surfactant and is used in an mount of 0.0001-1 pts.wt. per 100 pts.wt. The cationic surfactant is a primary to quaternary ammonium salt and has an alkyl group of 8-24 carbon atoms in its structure, while the nonionic surfactant is a silicone surfactant or has a polyoxyalkylene chain in the silicone molecular structure. |
