| 摘要 |
PROBLEM TO BE SOLVED: To provide a concrete composition which has high initial strength, and also has small drying shrinkage strain, thus cracks are suppressed, and concrete hardened body.SOLUTION: The concrete composition and its hardened body use portland cement and limestone aggregate as coarse aggregate and fine aggregate, and are further blended with blast furnace slag fine powder and fly ash. For example, the concrete composition and its hardened body contain, as unit quantity, water/cement ratio of 35 to 60%, limestone coarse aggregate of 900 to 1,100 kg/m, limestone fine aggregate of 740 to 950 kg/m, blast furnace slag fine powder of 100 to 300 kg/mand fly ash of 50 to 100 kg/m, and exhibit compression strength of ≥10 N/mmon 7 days material age, and shrinkage strain of ≤450×10on 26 weeks material age. |
