| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a cement admixture and a cement composition which exhibits good resistance to neutralization property even if a blast furnace slag powder, fly ash or silica fume is used. <P>SOLUTION: The cement admixture contains (A) one or more kinds of powders selected from among a blast furnace slag powder, fly ash and silica fume and (B) a pulverized fired product which contains 2CaO-SiO<SB>2</SB>and 2CaO-Al<SB>2</SB>O<SB>3</SB>-SiO<SB>2</SB>, wherein the content of 2CaO-Al<SB>2</SB>O<SB>3</SB>-SiO<SB>2</SB>+4CaO-Al<SB>2</SB>O<SB>3</SB>-Fe<SB>2</SB>O<SB>3</SB>is 10-100 pts.mass and the content of 3CaO-Al<SB>2</SB>O<SB>3</SB>is 20 pts.mass or less, relative to 100 pts.mass of 2CaO-SiO<SB>2</SB>. The cement composition contains (A) one or more kinds of powders selected from among a blast furnace slag powder, fly ash and silica fume, (B) a pulverized fired product which contains 2CaO-SiO<SB>2</SB>and 2CaO-Al<SB>2</SB>O<SB>3</SB>-SiO<SB>2</SB>, wherein the content of 2CaO-Al<SB>2</SB>O<SB>3</SB>-SiO<SB>2</SB>+4CaO-Al<SB>2</SB>O<SB>3</SB>-Fe<SB>2</SB>O<SB>3</SB>is 10-100 pts.mass and the content of 3CaO-Al<SB>2</SB>O<SB>3</SB>is 20 pts.mass or less, relative to 100 pts.mass of 2CaO-SiO<SB>2</SB>, (C) gypsum and (D) a pulverized portland cement clinker. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
