| abstract |
The present invention provides an admixture for concrete and a concrete composition having an excellent effect of suppressing carbonation and having a self-healing ability for cracks. A material containing one or more non-hydraulic compounds selected from the group consisting of γ-2CaO.SiO 2 , α-CaO.SiO 2 , and calcium magnesium silicate, comprising a Blaine specific surface area Is less than 2,000 cm 2 / g, and an admixture for concrete and a concrete composition using the same. By using the admixture for concrete of the present invention, it is possible to obtain a concrete composition having an extremely excellent neutralization suppressing effect and having a self-healing ability for cracks. In addition, there is an effect that the above-mentioned non-hydraulic compound and the steelmaking slag which is a kind of industrial waste containing the non-hydraulic compound, for which an effective utilization method has not been found, can be effectively utilized in an unprecedented amount. [Selection diagram] None |