Abstract
Blast furnace slag, which was previously considered to be a waste product, contains, among other elements, silica and alumina. A high percentage of lime is also present in the slag. Portland blast furnace slag cement (PBFSC) is obtained by mixing the granulated blast furnace slag and ordinary Portland cement clinker in suitable proportions and grinding the resulting mixture to get a thorough and intimate mixture of the two constituents. Slag cement can also be manufactured by separately grinding Portland cement clinker and granulated blast furnace slag and then mixing them intimately. No other material except gypsum can be added to the ground material. The resultant product, known as slag cement, has physical properties similar to those of ordinary Portland cement. Due to the use of the waste product (slag) in large quantities and Portland clinker as activator, the resulting slag cement also becomes cheaper. Other activatores have also been recommended to reduce the cost of slag cements.
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