Curing
In this article we discussed the following
- what is curing of concrete
- Objectives of curing
- Methods of curing
Curing is the process which is actively employed for promoting the hydration of cement in a suitable environment in early stage of hardening of concrete
As per IS-456:2000 curing is the process of prevention of moisture from the concrete while maintaining satisfactory temp.
Curing must be done for at least 3 weeks and is no case for less than 10 days
It is carried out at temp of 5-28 degree celcius and of 90% humidity
If concrete is cured for one month its strength is nearly double than that of concrete which is exposed to air
Objectives of curing
- To keep capillary pore saturated to ensure hydration of cement
- To improve wear resisting quality
- To prevent the loss of moisture from concrete due to evaporation or any other reason
Curing can be done by any of the following method
- Shading of concrete surface
- Covering concrete surface with wet gunny bags
- sprinkling water on concrete surface
- Ponding of concrete surface Best method
- Application of curing compounds like bitumen tar acrylate chlorinated rubber, sodium silicate water glass linseed oil . These compounds make a film fill the pores seal the surface voids and prevent evaporation
- Accelerated curing (steam infrared curing) for concrete with W/C ranging 0.3-0.7 the increased rate of strength development can be achieved by using steam curing
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