| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a cement composition for high strength concrete which has high flowability and improves the compressive strength after 28 day material age without damaging the compressive strength in 7 day material age and a high strength concrete composition. <P>SOLUTION: The cement composition for high strength concrete is a high belite type cement composition containing C<SB>2</SB>S of 30-60 mass% by the Bogue's equation, of which the total amount of free lime is 0.70 mass% or less, the amount of chloride ion is 0.013 mass% or less, the amount of belite α' phase is 3.0 mass% or more, and the amount of water-soluble alkalis is 0.30 mass% or less. The high strength concrete composition contains the cement composition, coarse and fine aggregate containing limestone, a high-range AE water reducing agent, and water. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
