| abstract |
(57) [Abstract] [Problem] A cement composition which is mainly used in the field of civil engineering and construction, which can increase the content of blast furnace slag, and which has good initial strength development and small temperature dependence. To provide the resulting cement admixture. A clinker comprising a mineral group containing free lime, hain, and anhydrous gypsum as an active ingredient, which is produced by heat-treating a mixture containing a CaO raw material, an Al 2 O 3 raw material, and a CaSO 4 raw material. A cement admixture containing at least one selected from the group consisting of formic acid, lactic acid, and acetic acid or salts thereof, and a cement composition containing the cement admixture. |