| abstract |
(57) [Summary] In the early-strength cement composition having a low water-cement ratio, when the addition amount of a water reducing agent or the like for improving fluidity or slump loss is increased, the strength development at the early age is increased. Decrease. SOLUTION: A cement is mixed with a polyoxyalkylene compound having an addition mole number of an oxyalkylene group having 2 to 5 carbon atoms of 20 to 200, anhydrous gypsum, aluminum sulfate, aluminate, and a calcium salt having high solubility. |