What are the potential effects of extreme temperatures on concrete curing?

Extreme temperatures can significantly influence the curing process of concrete. When temperatures rise, especially in hot weather, the rate of evaporation of moisture from the surface of freshly placed concrete increases. This rapid loss of moisture can lead to conditions known as plastic shrinkage cracking, where cracks develop on the surface while the concrete is still in a plastic (unset) state.

Elevated temperatures can also accelerate the setting time of the concrete, which means that workers may have less time to finish the surface properly before it starts to harden. Ensuring adequate moisture during the curing phase is crucial for achieving the desired strength and durability of the concrete. In essence, the impact of extreme heat during curing is mainly detrimental, leading to issues such as cracking and reduced structural integrity if not managed properly.

Other options, such as improving hydration and strength or having no significant effect, do not accurately reflect the reality of how extreme temperatures affect the curing process. Enhancing color uniformity is also unrelated to the curing process itself, focusing instead on aesthetic aspects rather than structural outcomes.