| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a cement composition from which mortar or concrete having high strength and high workability can be produced simply. <P>SOLUTION: The cement composition comprises portland cement containing 30-60 mass% of 2 CaO-SiO<SB>2</SB>and silica fume with a BET specific surface area of 5-15 m<SP>2</SP>/g. Preferably, the portland cement contains at most 6 mass% of 3 CaO-Al<SB>2</SB>O<SB>3</SB>and silica fume contains 0.5-5.5 mass% of Al<SB>2</SB>O<SB>3</SB>and 0.01-0.025 mass% of SO<SB>3</SB>. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
