| 摘要 |
<p>PURPOSE:To form mixed cement reducing heat of hydration without lowering the strength of mortar or concrete by blending Portland cement with blast furnace slag and gypsum in a specified ratio and limiting the fineness of this raw material mixture. CONSTITUTION:A raw material mixture is prepd. by blending 1 pt.wt. Portland cement with 1-9 pts.wt. blast furnace slag and 2.5-4.0 pts.wt. (expressed in terms of SO3) gypsum basing on 100 pts.wt. mixture and the fineness of the mixture is regulated to >=3,500cm2/g. The fineness of the blast furnace slag in the mix ture may be regulated to >=4,000cm<2>/g. In this case, it is not necessary to limit the fineness of the mixture.</p> |
