How is PSC manufactured? What are its advantages?

PSC stands for Portland Slag Cement.
Portland Slag Cement is obtained by an intimate and uniform blending of Portland and finely ground granulated blast slag (GGBS).

As per IS 455, the slag constituents should be between 25-70 % of PSC.

Blast furnace slag is a non-metalic product consisting essentially of silicates and alumino-silicates of calcium developed in a molten condition simultaneously with iron in blast furnace.

GGBS (Ground granulated  blast slag) is obtained by rapidly cooling the molten slag, which is at a temperature of about 1500 °C, by quenching water or air to form a sand like material.

Every year about nine million tons of blast furnace slag is produced in india.

Portland Slag Cement has similar properties as ordinary Portland cement (OPC).

Advantages:

There are following advantages of PSC:
  • It has a lighter colour.
  • Better concrete workability.
  • Easier finishibility.
  • Higher compressive and flexural strength.
  • Lower permeability.
  • Improved resistance to agressive chemicals.
  • More plastic and hardened consistency.
  • Low heat of hydration.
  • Utilisation of slag cement in concrete lessens the burden on land fills.

Portland Slag Cement is available in India as following brand names: UltraTech premium, super stell (Madras Cement) and S 53 (L&T) etc.