POWDERY SHRINKAGE REDUCING AGENT FOR CEMENT PREMIX PRODUCT AND CEMENT PREMIX PRODUCT

摘要

PPROBLEM TO BE SOLVED: To provide a powdery shrinkage reducing agent for a cement premix product which, even if bagged, stacked and preserved, is not blocked, can prevent the occurrence of reduction in compressive strength and increase in a dry shrinkage percentage or the like of a cured body obtained by preventing the excess of air entraining quantity upon the kneading of a cement premix product prepared by using the powdery shrinkage reducing agent, and further, even if preserved over a long period in combination with a defoamant for example, can prevent the similar problem, and to provide a cement premix product prepared using the same. PSOLUTION: As the powdery shrinkage reducing agent for a cement premix product, the one containing: a specified polyether mixture of 49.5 to 65 mass%; porous silica fine powder of 34.5 to 50 mass%; and an oxidation inhibitor of 0.001 to 0.5 mass% (total 100 ppm%) is used. PCOPYRIGHT: (C)2009,JPO&INPIT