Concrete Workability : Definition, Factors and Test
We will hear so many times about Concrete Workability if we are working in Construction world. In Civil Engineering study, Concrete Workability is one of most important things to study in structural engineering subject. Concrete Workability is indeed very crucial in construction. When we want to pour concrete in specific structure / frame, we have to consider its concrete workability. When the concrete is delivered from long distance, it is urgent to add a special mixture to maintain the concrete condition. When concrete is too loose, the strength of the structure will be weak. If the concrete is really solid before pouring, then it will cause some problem in pouring. This will make a potential to make honey comb in a specific structure. So, what is Concrete Workability ?
Concrete Workability Definition :
ASTM (American Society for Testing and Materials) defines it as “that property determining the effort required to manipulate a freshly mixed quantity of concrete with minimum loss of homogeneity”.
Powers defined it as “that property of plastic concrete mixture which determines the ease with which it can be placed and the degree to which it resists segregation”
ACI (American Concrete Institute) defines it as ‘that property of freshly mixed concrete or mortar which determines the ease and homogeneity with which it can be mixed, placed, consolidated and finished’.
According to Granville “it is that property of the concrete which determines the amount of useful internal work necessary to produce full compaction.”
From those four definitions stated by the experts, we can determine that Concrete Workability is when concrete can be handled without segregation, placed without loss of homogenity and finished easily.
In construction world, Concrete Workability are influenced by :
- Distance of transporting.
- Extent of reinforcement.
- Type of construction work.
- Environmental condition.
- Method of placing and mixing.
Concrete Workability can be tested by doing Slump Test. Below is the picture of Slump Test :