The main motive of the concrete curing process is to reduce water loss from freshly placed concrete. It also reduces heat loss to the surrounding atmosphere. Moreover, curing in construction minimizes the temperature gradient throughout the concrete cross-section and ensures proper hydration.
Generally, the following methods are used for the curing of concrete.
- Ponding and immersion.
- Wet coverings with plastic sheets.
- Wet coverings (hessian, burlap, etc.).
Disadvantages of Ponding Curing
This method is commonly used for flat surfaces such as pavements, floors, and slabs where water can be retained on the surface.
- Ponding curing requires continuous supervision by skilled labor to maintain a constant water level.
- Cold wind or high evaporation rates can disturb the water layer and reduce curing efficiency.
- Leakage from improperly constructed bunds may cause uneven curing.
- After curing, a large quantity of water must be drained and disposed of properly.
Disadvantages of Polythene Sheet Curing
This method is based on preventing evaporation by isolating concrete from direct exposure to air. However, the following limitations should be considered:
- Polythene sheets can be easily displaced or blown away in windy conditions.
- If not properly sealed at the edges, moisture loss may still occur.
- Improper contact between sheet and concrete surface may lead to non-uniform curing.
- Polythene sheets may cause surface discoloration due to uneven moisture retention.