Which type of admixture is designed to increase the workability of concrete mixes?

Workability agents, also known as plasticizers, are specifically formulated to enhance the workability of concrete mixes. They reduce the viscosity of the concrete, making it easier to mix, place, and finish. By increasing the fluidity of the mixture without the need for additional water, these agents help maintain the strength and durability of the concrete while improving its handling characteristics.

In concrete technology, maintaining an appropriate workability is crucial, especially in complex pours or intricate mold shapes. This can lead to better compaction and reduced risk of defects in the finished product.

Other options, such as accelerators, primarily focus on speeding up the curing process or the setting time of concrete, but do not specifically address workability improvements. Coarse aggregates and admixtures in general serve a broader range of functions, but it is the specific category of workability agents or plasticizers that directly addresses the enhancement of workability in concrete mixes.