What is Workability
Workability is defined as that property of the concrete which determines the amount of useful internal work necessary to produce full compaction.
In other words, workability is property of fresh concrete or mortar which determines the ease and homogeneity with which it can be mix, placed, compacted and finished.
So, A concrete said to be workable if it is easily mixed, placed, compacted and finished without any segregation.
Factors Affecting The Workability of Concrete
The elements affecting the workability of concrete can be list as follows:
1. Water Content
Workability improves with the increase in water content in concrete and vice versa.
2. Mix Proportion
Aggregate-cement ratio is an important factor influencing workability. The lower aggregate-cement ratio gives higher workability and vice versa.
3. Size of Aggregate
Use of large size aggregate in concrete gives better workability within certain limits.
4. Shape of Aggregate
Use of round aggregate in concrete gives higher workability than that of angular or flaky aggregate.
5. Surface Texture of Aggregate
The rough textured aggregate will show poor workability and smooth textured aggregate will give better workability.
6. Grading of Aggregate
The better the grading, higher workability.
7. Use of Admixture
Uses of admixture such as air-entraining agents, plasticizers etc give better workability.