| 摘要 |
PROBLEM TO BE SOLVED: To provide a concrete composition that can reduce the contraction of concrete, that is also small in slump loss, and that can impart a high crack resistance and to provide a method for producing the same.SOLUTION: Methods for producing: (1) a concrete composition that contains an aggregate formed by subjecting portland cement clinker to carbonation treatment, and a shrinkage-reducing agent, (2) a concrete composition of (1) in which COcontent in the aggregate is 2% or more, (3) a concrete composition of (1) or (2) in which the aggregate is coarse aggregate of 5 to 40 mm and/or fine aggregate of below 5 mm, and (4) a concrete composition that is formed by blending a shrinkage reducing agent into an aggregate formed by comminuting portland cement clinker and subjecting the same to carbonation while immersing in water. |
