What is typically the purpose of using retarders in mortar?

Using retarders in mortar serves the crucial purpose of delaying hydration. Hydration is the chemical reaction that occurs when water is mixed with cement, leading to the hardening process. In certain construction situations, particularly in hot weather or when working with large batches of mortar, the setting time can be overly rapid, which might compromise the workability, placement, or overall quality of the mortar joint.

By incorporating retarders, the hydration process is slowed down, allowing for extended work time. This is particularly beneficial for tasks that require precision, such as intricate brickwork or stonework, where adjustments may need to be made during application. By controlling the setting time, workers can ensure that the mortar maintains its workable consistency for longer periods without risking premature hardening. This attribute of retarders makes them critical for achieving optimal results in masonry projects.