Curing of concrete:Water is one of the most important ingredient of concrete. Water cause the chemical reaction with cement which called ' Hydration reaction’.The Hydration reaction cause the concrete to set and develop strength.It takes time for the complete development of strength around 28 days.It is essential that water has to remain in the concrete till it attains it's full strength.When the formwork for the RCC members are removed the concrete gets exposed to the air. The water from the concrete starts to evaporate to the atmosphere.The Hydration reaction is an exothermic reaction due this heat the temperature of concrete rises and cause evaporation of the water inside the concrete.Hence there can be loss of water due to two reasons.Exposure to the atmosphereDue to heat generated by Hydration.It therefore necessary to cure concrete.To prevent evaporative losses and to keep control on the temperature of concrete.Methods of curing:Ponding.Spraying.Fogging.Covering with plastic sheet.Curing compound.Steam curing.Wrapping the RCC members with wet jute clot.1. Ponding: Ponding means providing a thin layer of water on the top of the concrete surface. This method is used for curing slabs in this method bunds of mortar are spreaded around the perimeter of the slab and the portion in between is kept filled with a thin layer of water.2. Spraying: Water is continuously sprayed on the surface of exposed concrete.The water tends to evaporate quickly in hot and dry climate.Hence the surface is covered with jute cloth which is kept wet.3. Fogging: Inested of continuously spraying water on the surface, a continuous mist is created around the concrete members.4. Covering the surface with plastic sheet: The freshly cast slab in covered by a plastic sheet. This prevent evaporative losses.5. Curing compound:Special compound in liquid state are brushed on the surface of concrete.They from a water proof film Which does not allow moisture to escape from the surface.6. Steam curing:Used for precast RCC members.Members kept in a steam chamber for curing.It is very fast method of curing.7. Warping the RCC members with wet jute clot:In this method the RCC members covered with jute clot and curing. It provides long time moisture to the surface.