| 摘要 |
To provide cement additives which render high fluidity and the retention thereof, excellent shrinkage reducing effect and frost-thaw resistance to cement compositions such as mortar and concrete without entraining excessive air, and exhibit excellent solution stability. The present cement additives contain alkenyl group-containing polyalkylene compounds (SR), ester-based polycarboxylic acid copolymers (PC1) and ether-based polycarboxylic acid copolymers (PC2).
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