Special Portland Cements for Durability

Special Portland cements are made for specific building needs, such as added durability, color, or lower cracking risk. One major example is Portland blast-furnace cement. It is made by blending Portland cement clinker with granulated blast-furnace slag, which makes up about 25 to 65 percent of the cement by weight.

Intergrinding Portland cement clinker with granulated blast-furnace slag, a by-product of the iron-making process, produces slag cement.

It can be used to construct large structures designed to resist the attack of chlorides and sulfates.

White cement, made from chalk and china clay containing fewer quantities of iron and manganese...