superplasticizer; high-performance water-reducing agent
Technical term in concrete engineering; a chemical admixture that greatly improves workability without adding extra water.
Adding a superplasticizer greatly improves the fluidity of concrete.
A general water-reducing agent; 高性能減水剤 is a high-performance variant with stronger effect.
Air-entraining water-reducing agent; 高性能減水剤 does not necessarily entrain air.
Compound of 高性能 (high performance) + 減水剤 (water-reducing agent).