CEMENT ADMIXTURE, CEMENT COMPOSITION, QUICK HARDENING GROUT MATERIAL, AND QUICK HARDENING GROUT

摘要

PPROBLEM TO BE SOLVED: To provide a cement admixture, a cement composition, a quick hardening grout material, and a quick hardening grout which are characterized in that there is non-bleeding and no material separation, flowability is not lowered largely, pot life for at least 30 min is secured, strength can be developed in a short time, there is no shrinkage, the elution of hexavalent chromium from a hardened body is very low, and it does not cause environmental pollution. PSOLUTION: The cement admixture contains a calcium aluminate compound, gypsums, a blast furnace slowly cooled slag powder, an expansive material, and a clayey mineral. The content of sulfur existing as non-sulfuric acid sulfur in the blast furnace slowly cooled slag powder is set to be 0.5%. Further, the cement admixture has a vitrification rate of 30 %. The cement composition contains cement, the cement admixture and a setting modifier. The quick hardening grout material contains fine aggregate and the cement composition. PCOPYRIGHT: (C)2006,JPO&NCIPI