Blast Furnace Slag Cement:

The blast furnace slag, which is a waste product obtained during manufacture of iron, contains all the basic elements of cement, i.e. silica, alumina, lime, iron, etc. It is crushed preliminary to a granulated form, which is then intimately mixed with cement clinkers in the proportion of 65 % of slag to 35 % of clinkers and both are then grounded together to form cement. It is cheaper than OPC. It develops low heat of hydration and has less early strength.

The below given are the uses of blast furnace slag cement:

(a)        It is used for mass concrete works like as retaining walls, bridge abutments, dams, etc.

 (b)      It is used for all reasons for which OPC is used.