| 摘要 |
PROBLEM TO BE SOLVED: To provide a cement composition capable of manufacturing a cement-based hardened body (mortar, and concrete) which has a small contraction coefficient in a long-term material age.SOLUTION: A cement composition includes at least cement, bone material, water and at least either expanding material or contraction reducing agent, wherein a part or the whole of the bone material is barite. Mortar is produced by hardening the cement composition. Concrete is produced by hardening the cement composition. |
