What effect does high heat have on concrete?

High heat can significantly impact the characteristics of concrete, particularly affecting its workability, which refers to how easily the concrete can be mixed, placed, and finished. When concrete is subjected to high temperatures, the water in the mix can evaporate more quickly, leading to a phenomenon where the mix becomes stiffer and harder to work with. This results in what is known as a loss of slump, which measures the consistency and workability of the concrete mix.

In general, a reduction in slump indicates that the concrete is losing its fluidity and becoming more difficult to work with. This can pose challenges during construction, making it harder to place the concrete in forms and finish the surface appropriately. Understanding this effect is crucial for any construction engineer or laborer, enabling them to take necessary precautions, such as adjusting the water content in the mix or employing cooling measures during hot weather to maintain proper workability.