| abstract |
Cement admixture, cement composition, and low environmental load type, reduced hexavalent chromium, small slump loss and hydration calorific value, hardly neutralized, and can suppress self-shrinkage Providing cement concrete. The main component is a melilite, the CO 2 absorption is 2% or more, the ignition loss is 5% or less, the sulfur present as non-sulfuric sulfur is contained 0.5% or more, and / or is eluted. The sulfuric acid sulfur concentration is 100 mg / l or more, more preferably, the vitrification rate is 30% or less, the lattice constant a of melilite is 7.73 to 7.82, and / or the brain specific surface area is 4,000 cm 2. Blast furnace slow-cooled slag powder that is greater than / g is used as a cement admixture. |