Workablilty Of Concrete:
Workability of concrete is that property of freshly mixed concrete or mortar which determine the ease and homogeneity with which it can be mixed, placed, compacted and finished. The concrete mix is said to be workable if it has mixability, stability, flowability or movability, compatibility and finishability. The optimum workability of fresh concrete varies from situation to situation.
Factors Affecting Workability Of Concrete:
Sometimes the terms consistency and plasticity are used to denote the workability of concrete mix. Following are the factors which affect the workability of concrete are:
The workability of concrete largely depend upon its water content. It increases with increase in water content on account of greater lubrication.
Size of aggregates:
The concrete having larger size of aggregates are more workable than that containing small size aggregates because the smaller size aggregates require more quantity of water for lubrication.
Shape of Aggregates:
The round shape aggregates increase the workability of concrete whereas angular, flaky and elongated aggregates reduce the workability of concrete considerably.
Surface texture of aggregate:
The smooth surface aggregates increase the workability of concrete because less quantity of water is required for lubrication. On the other hand, rough surface aggregates, reduce the workability of concrete because more quantity of water is required for lubrication.
Grading of aggregates:
The grading of aggregates affects the workability of concrete and should be continuous lean concrete mix.
Air entraining agent:
The air bubble produced due to adding air entraining agents in the concrete mix act as rollers and thus increase the workability of concrete.
The workability of concrete mix reduces at higher temperature.
I hope that this article will help you to understand about FACTORS AFFECTING WORKABILITY OF CONCRETE