Retarders

Retarders are chemical admixtures designed to extend the setting time, which is especially useful when there is a delay in sequential concrete pours to prevent cold joints and to achieve a cohesive structure. Retarders, when used in appropriate amounts, can also enhance the architectural appearance of exposed aggregate finishes.

The funct...

In hot weather concreting, when the normal setting time is shortened by the higher temperature, it can lead to the formation of cold joints between successive batches.

When retarders are used in concrete, the initially poured concrete remains plastic for longer to ensure cohesivity with the next batch of freshly poured concrete layer.