What are the common methods to control temperature in concrete during hot weather?

The correct approach to control temperature in concrete during hot weather involves utilizing cool water, shading techniques, and the addition of chemical retarders.

Using cool water in the mix reduces the initial temperature of the concrete, which is especially important when ambient temperatures are high. This helps to slow down the hydration process and mitigate issues such as rapid evaporation, which can lead to cracking.

Shading the concrete protects it from direct sunlight, reducing surface temperatures and limiting the effects of heat. This prevents premature drying and helps maintain the integrity of the curing process.

The application of chemical retarders extends the workability of the concrete by slowing down the hydration reaction, which is beneficial in hot weather conditions. This allows for more time to place and finish the concrete without compromising its quality due to rapid setting.

Other methods, such as using hot water or increasing cement content, may inadvertently lead to higher temperatures, which is counterproductive during hot weather. Pouring concrete only at night, while it can reduce exposure to heat, may not always be feasible or practical for large-scale jobs, as it limits working hours and may affect the overall construction schedule.