Concrete Curing Requirements

Concrete curing is a process of maintaining moisture content and temperature within the concrete for a specified period to attain the desired strength and durability. The curing process is critical to the strength, durability, and serviceability of concrete structures. The Indian Standard specifications prescribe the requirements for curing concrete, which are as follows:

Humidity Requirements

The humidity requirements for curing concrete as per Indian Standard specifications are as follows:

- The relative humidity should be maintained at not less than 90% for seven days after the placement of concrete.
- The humidity should be maintained at not less than 80% for the remaining period of curing, which is generally 28 days.

Other Requirements

Apart from humidity, the Indian Standard specifications prescribe the following requirements for curing concrete:

- The temperature of the concrete should be maintained between 10°C and 50°C during the curing period.
- The curing period should be a minimum of 7 days for ordinary Portland cement concrete and a minimum of 10 days for concrete made with blended cements or mineral admixtures.
- The curing period can be extended depending on the type of structure, exposure conditions, and strength requirements.

Conclusion

In conclusion, the Indian Standard specifications prescribe the humidity requirements for curing concrete. The concrete should be cured under a humidity of not less than 90% for seven days after the placement of concrete and not less than 80% for the remaining curing period. Apart from humidity, the temperature, curing period, and other factors should also be considered while curing concrete to attain the desired strength and durability.