What effect does a decrease in temperature have on the workability of a concrete mix?

A decrease in temperature has a direct impact on the workability of a concrete mix, which often leads to changes in slump. Slump is a measure of the consistency or flowability of fresh concrete, and it is affected by various factors, including temperature. When the temperature is lower, the hydration process of the cement can slow down, leading to stiffer mixtures that are less workable. Consequently, the ability to place, compact, and finish the concrete can be adversely affected, and this is typically reflected in a lower slump reading.

Understanding this relationship is crucial for construction professionals to ensure that they can achieve the desired concrete performance and make adjustments to their mix design or placement procedures accordingly to maintain proper workability in cooler conditions.