| abstract |
(57) Abstract: A super-hardened cement composition and a powdery and ultra-hardened cement composition comprising a dispersant obtained by dry-pulverizing a compound having at least units of formulas (1) and (2) in a molecule and water and water. . Embedded image (Wherein R 1 , R 2 and R 3 represent a hydrogen atom or a methyl group, R 4 represents an alkyl group having 1 to 3 carbon atoms, M represents a hydrogen atom, an alkali metal, an alkaline earth metal, ammonium or represents an organic amine, Y is -CH 2 O-or -CO (Indicates O- and n represents a number of 20 to 109.) [Effect] It is excellent in fluidity and rapid hardening property. |