Several factors affect the workability of concrete, including the water-cement ratio, the type of aggregate used, the size and shape of the aggregate, the temperature, and the use of additives. A higher water-cement ratio makes the concrete workable, while a lower water-cement ratio makes it less workable. The aggregate’s size and shape affect the concrete’s strength and workability. Additives such as plasticizers and superplasticizers can improve the workability of concrete.