| 摘要 |
PURPOSE:To shorten setting time by incorporating a specified fired or melted product, CaSO4 and an alkali metallic salt. CONSTITUTION:Ca, Na and Al sources are mixed so that the amts. are regulat ed to >=20 wt.%, >=2 wt.% and >=30 wt.% (expressed in terms of CaO, Na2O and Al2O3), respectively, the mixture is fired or melted at >=1,300 deg.C and pulver ized to obtain a fired or melted product having >=3,000 cm<2>/g Blaine value and 30-80wt.% of this fired or melted product is blended with 5-60 wt.% CaSO4 and 2-50 wt.% alkali metallic salt such as na2CO3. |
