Hot Weather Concreting: Building Tips for this Summer
The temperature is soaring high all across India, marking the arrival of the summer season in full force. In some parts of country, it has already crossed 40°C and 43°C. The rising temperature presents a huge challenge when it comes to effective management of concrete especially JK Lakshmi Pro+ Cement.
Special problems are encountered in the preparation, placement and curing of concrete in hot weather. The increasing temperatures result in rapid hydration of cement, increased evaporation of mixing water, greater mixing water demand, and large volume changes, resulting in cracks.
Thus, it is very important to create awareness about the precautions we should take in the hot weather concreting.
Following are the effects of hot weather concreting.
- Reduction in strength: High temperature results in the increase of quantity of mixing water to maintain the workability with consequent reduction in strength.
- Increased tendency to crack: Either before or after hardening, plastic shrinkage cracks may form in the partially hardened concrete due to rapid evaporation of water. Cracks may also develop in hardened concrete either by increased drying shrinkage resulting from greater mixing water used or by cooling of the concrete from its elevated initial temperature.
- Rapid Evaporation of Water during Curing period: It is difficult to retain moisture for hydration and maintain reasonably uniform temperature conditions during the curing period.
In order to minimise above problems, it is advisable to take following precautions.
- Avoid concreting during 11 a.m. to 4 p.m.
- Store cement, sand, stone aggregates and water under shed
- Sprinkle water on stone aggregates to cool them
- Forms, reinforcement, and sub grade should be sprinkled with cool water just prior to placement of concrete.
- Speed of placement and finishing helps to minimize problems in hot weather concreting. Delays contribute to loss of workability and lay to use of additional mixing water to offset such loss.
- Particular attention should be paid to protect all surfaces from drying. Immediately after consolidation and surface finish, concrete should be protected from evaporation of moisture by means of wet (not dripping) gunny bags, hessian cloth etc.
- Once the concrete has attained some degree of hardening, sufficient to withstand surface damage, (approx. 10 hour-after mixing), moist curing should commence.
- Water Ponding on slabs is recommended for 10 days.
In case you are building your dream home during the hot weather, keep in mind the above steps so that it doesn’t impact the quality of your concrete. Happy home building!
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