Water resistance or proofing is an important factor in health and comfort of building occupants. Water proof construction implies the use of a membrance or a film that provides a barrier and covers all surface pores or capillaries. Cement water proofing compounds or water repellant agents are widely used in civil construction works. They are used in the masonary works like dams etc., in the godowns, basements and storage tanks. Among the various varieties of cement, the most commonly used in India is the ordinary portland cement, which is popularly known as gray cement. The largest share in the total consumption of cement is of ordinary portland cement, accounting for more than 70%. OPC is manufactured by grinding clinker with a small quantity of gypsum. It is used in mass and reinforced concrete, and all types of general concrete constructions. There is a good scope for new entrants.
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