| 摘要 |
PROBLEM TO BE SOLVED: To obtain an admixture not requiring equipment for removing the heat generated by a high stress at the time of extrusion, and capable of providing a kneaded product of a cement and water having low adhesion by including a water-soluble polymer having an alkyl group having the specific number of carbon, and an acid amide group in the molecule. SOLUTION: This cement admixture contains a water-soluble polymer having a 5-30C alkyl group and an acid amide group in the molecule. The water-soluble polymer preferably has hydroxy group besides the alkyl group and the acid amide group. Preferably, the hydroxy group is directly bonded to the main chain of the water-soluble polymer, and the acid amide group is obtained from acrylamide and/or an N-substituted derivative thereof. The alkyl group is preferably one or more selected from an aliphatic vinyl ester, an olefin, an alkyl vinyl ether and an N-alkyl-substituted acrylamide. The cement admixture of 0.1-5.0 wt.% is preferably included in the cement. |
