Steam curing can be used to advantage where early strength gain in concrete is important or where additional heat is required to accomplish hydration, as in cold-weather concreting.
- It can be used in cold weather conditions for Rapid hardening of concrete
- By this method high early age strength is achieved in concrete
- Speedy construction can be achieved
- Concrete curing time is less than the other methods of curing
- It is mainly used for curing of precast members
- Steam curing method cannot will not be efficient for large surface.
- Skilled labours are needed & special materials are required.
- Initial cost of this curing method is high.
METHOD OF CURING:
There are two methods of steam curing
(1) curing in live steam at atmospheric pressure (for enclosed cast in place structures and manufactured precast units)
(2) curing in high pressure steam autoclaves (for small manufactured units)
A steam curing cycle consists of:
- An initial delay prior to steaming
- A period for increasing temperature
- A period for holding the maximum temperature constant
- A period for decreasing temperature.