| abstract |
[PROBLEMS] Non-bleeding, no material separation, no significant decrease in fluidity, ensuring a pot life of 30 minutes or more, having strength development in a short time, no shrinkage, The present invention provides a cement admixture, a cement composition, a rapid-hardening grout material, a rapid-hardening grout, and a ground deformation preventing method using the same, in which the amount of hexavalent chromium eluted from the cured body is extremely small. A calcium aluminate compound, a gypsum, a blast furnace chilled slag powder, a cement admixture containing an expanding material, and a blast furnace chilled slag powder having a non-sulfate sulfur content of 0.5% or more. Further, the cement admixture having a vitrification rate of 30% or less, cement, the cement admixture, and a cement composition containing a setting modifier, a fine aggregate, and the cement composition The rapid-hardening grout material and the natural ground deformation preventing method using the rapid-hardening grout are configured. [Selection figure] None |