| abstract |
(57) [Abstract] [Problem] To improve the fluidity of mortar and concrete, Provided are a cement admixture and a cement composition which achieve high strength and early strengthening, and have excellent initial strength development at low temperatures. SOLUTION: A strength enhancing material composed of anhydrous gypsum and / or silica fine powder, at least one or more selected from formic acid, lactic acid, acetic acid and salts thereof, and a sulfite, a bisulfite, a pyrosulfate, A cement admixture containing at least one member selected from the group consisting of pyrosulfite and pyrobisulfite, and a cement admixture further containing a high-performance water reducing agent. And a cement composition containing the cement. |