| 摘要 |
PROBLEM TO BE SOLVED: To provide a shrinkage reducing agent capable of obtaining a hardened body having excellent shrinkage-reducing effect in high-temperature environment and capable of having a proper amount of air and maintaining good freeze-thaw resistance.SOLUTION: There is provided a shrinkage reducing agent for cement which comprises an alkylene oxide adduct represented by the general formula (1) and in which the cloud point of a 1 mass% aqueous solution of the alkylene oxide adduct is 18 to 72°C. RO-[(PO)/(EO)]-H (1) (where, R represents an alkyl group having 18 or more carbon atoms or alkenyl group; the alkyl group or the alkenyl group in R is a linear or branched; PO represents an oxypropylene group, EO represents an oxyethylene group: and p and q satisfy the following formulas (A) to (C): 1≤p≤20 (A), 1≤q≤30 (B) and 10<p+q≤30 (C).SELECTED DRAWING: Figure 1 |
