Factor Affecting  the Workability of Concrete

In this article we discuss some of the the factors which affect the workability of the concrete

Following Factor are affected workability of concrete -

Water content :-

 Workability of concrete increase as
Water content increase 

Note :

 Concrete workability cement water ratio inversly proportional to  workability of cement concrete

 Mix Proportion :- Mix of concrete broadly classified as 2 types

a) Lean mix

 b) Rich Mix

a) Lean Mix : If aggregate to cement ratio is high is called lean mix.

Lean mix less workable with respect to rich mix

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b) Rich Mix : if the aggregate to cement ratio is low is called Rich mix

Workability of rich mix are more compared to lean mix.

 Size of aggregate :- Courser partical Workability Finner courser compare 

 Courser agg. - Less surface area - More workable - Low strength

 Finner agg. - More surface area - Less workable - High Strength

 Shape of Aggregate :

 According to Shape of Aggregate it is classified in 4 types -

a) Rounded Aggregate

b) Angular Aggregate (Cubical Angular Agg.)

c) Flakiness aggregate

d) Elonginated Aggregate

Note :-  for Best Workability of concrete Rounded aggregate are used as it has high workability

-For Concrete High Strength Angular Shape (Cubical shape) Aggregte are used.

- In Concrete work Flakiness or elonginated shapes of aggregate are not generally used