| 摘要 |
PROBLEM TO BE SOLVED: To provide a high-strength cement admixture which reduces the amount of a shrinkage reducing agent to be used in concrete and reduces autogenous shrinkage, and to provide a cement composition obtained by using the high-strength cement admixture.SOLUTION: The high-strength cement admixture (1) is obtained by mixing/pulverizing silica fume and the shrinkage reducing agent. The high-strength cement admixture (2) is obtained by blending fly ash in the high-strength cement admixture (1) to obtain a mixture and mixing/pulverizing the mixture. The high-strength cement admixture (3) is obtained by blending blast furnace slag in the high-strength cement admixture (1) or (2) to obtain another mixture and mixing/pulverizing the mixture. A shrinkage reduction type high-strength cement admixture (4) is the high-strength cement admixture (1) having the maximum particle size equal to or smaller than 0.08 μm. Another shrinkage reduction type high-strength cement admixture (5) is the high-strength cement admixture (2) or (3) having the maximum particle size equal to or smaller than 5 μm. The cement composition contains cement (6) and the high-strength cement admixture (1), (2), (3), (4) or (5). |
