Define Workability of Concrete and Factors affecting - Civil Engineering

Monday, 11 February 2019

Define Workability of Concrete and Factors affecting


Workability is defined as that property of the concrete which determines amount of useful internal work necessary to produce full compaction. 
Define Workability and Factors affecting The Workability
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 mix,placed,compacted and finished without any segregation.

Factors Affecting The Workability

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 .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

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 gives better workability.

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