| 摘要 |
PROBLEM TO BE SOLVED: To produce an air quantity stabilizer applied for a cement blended material capable of increasing the quantity of an entraining air with time and excellent in stabilizing action on the entrained air quantity of the cement blended material with time, a cement admixture capable of improving the fluidity of cement blended material, strength at the time of hardening and the resistance against freezing and thawing and the cement blended material prepared by blending the air quantity stabilizer. SOLUTION: The air quantity stabilizer is prepared by incorporating an antifoaming agent in a water absorbing resin. As the water absorbing resin, a cross-linked polymer obtained by polymerizing a monomer component consisting essentially of a polyalkylene glycol (metha)acrylic ester based monomer is preferably used. The cement admixture contains the air quantity stabilizer and a cement dispersing agent. The cement blended material contains at least cement and water, and contains the air quantity stabilizer. As a result, the entrained air quantity in the cement blended material is stabilized. |
