When placing concrete in hot weather, what is a recommended precaution?

When placing concrete in hot weather, using chilled water and avoiding placing during peak sun exposure is a recommended precaution to mitigate the challenges posed by high temperatures.

High ambient temperatures can lead to rapid evaporation of moisture from the surface of the concrete, which can cause issues such as uneven curing, cracking, and reduced strength. By using chilled water, the concrete mix remains cooler during mixing and placement, which helps to slow down the setting time and allows for longer working times before it begins to cure.

Additionally, placing concrete during the hottest parts of the day can exacerbate these problems, increasing the likelihood of moisture loss and leading to poor surface quality and durability. Therefore, scheduling placement for cooler times of day—such as early in the morning or late in the afternoon—further aids in maintaining the integrity of the concrete. This combination of using chilled water and avoiding peak sun exposure effectively addresses the risks associated with hot weather concrete placement, ensuring better outcomes for the finished product.