DRY SHRINKAGE REDUCING AGENT COMPOSITION FOR PREMIXED MORTAR, PREMIXED MORTAR, AND CEMENT CURED BODY USING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a dry shrinkage reducing agent composition for premixed mortar that suppresses dry shrinkage and strength degradation, and has excellent working efficiency in fresh mortar.SOLUTION: A dry shrinkage reducing agent composition for premixed mortar is composed of 30-90 mass% of polyethylene glycol (A) in formula (1), and 10-70 mass% of polyether-impregnated powder (B). The polyether-impregnated powder (B) is composed of polyether (B1) in formula (2) and oil-absorbing inorganic powder (B2). A mass ratio ((B1)/(B2)) is 40/60 to 70/30. HO-(CHO)a-H ...(1) (in formula (1), a denotes an average addition mole number of oxyethylene group, and 35≤a≤500)