What is slag cement? What are its advantages/ disadvantages over OPC?
Slag is a by product of steel production. It is added to concrete to replace cement in concrete. Concrete with slag is easier to work and less susceptible to freeze thaw cycles. There are other benefits as well. Concrete with slag is being used in road construction in some states. I say some states because not all states have done enough teting to be satisfied with using concrete with slag.
