| 摘要 |
<p>PURPOSE:To make blast furnace slag show superior strength in the early stage and for a long period by adding a specified amount of a calcic mixture to the slag. CONSTITUTION:A blast furnace slag composition is obtd. by adding 1-10pts.wt. calcic mixture to 100pts.wt. blast furnace slag. The calcic mixture may be prepd. by mixing limestone with slaked lime in 0.2-5 weight ratio of limestone to slaked lime or further adding gypsum to the limestone-slaked lime mixture so as to regulate the gypsum content to >=80%. Since the blast furnace slag composition contains two or more kinds of calcic substances, it shows superior strength in the early stage and over a long period. The composition is effective in improving the quality of cement, ready-mixed concrete, or a secondary product thereof.</p> |
