Define workability. Write about segregation and bleeding.
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FACTORS AFFECTING WORKABILITY OF CONCRETE
A concrete is said to be workable if it is easily transported, placed, compacted and finished without any segregation. Workability is a property of freshly mixed concrete, and a concrete is a mixture of cement, aggregate, water & admixture. Due to this all the properties of concrete, whether in fresh state or hardened state, is affected by these ingredients and their proportions.
Factors Affecting Workability
The single most important nature of workable concrete is its lubricating nature. If a concrete shows more lubricating nature, then it will have the following advantages, such as
It will exhibit little internal friction between particle and particle
It will overcome the frictional resistance offered by the surface of the formwork and reinforcement contained in the concrete
It can be consolidated with minimum compacting effort.
The factors which help concrete to have more lubricating effect to reduce internal friction for easy compaction are given below.
Water content
Aggregate/cement ratio
Size of aggregate
Shape of aggregate
Grading of aggregate
Surface texture of aggregate
Use of admixture
A concrete is said to be workable if it is easily transported, placed, compacted and finished without any segregation. Workability is a property of freshly mixed concrete, and a concrete is a mixture of cement, aggregate, water & admixture. Due to this all the properties of concrete, whether in fresh state or hardened state, is affected by these ingredients and their proportions.
Factors Affecting Workability
The single most important nature of workable concrete is its lubricating nature. If a concrete shows more lubricating nature, then it will have the following advantages, such as
It will exhibit little internal friction between particle and particle
It will overcome the frictional resistance offered by the surface of the formwork and reinforcement contained in the concrete
It can be consolidated with minimum compacting effort.
The factors which help concrete to have more lubricating effect to reduce internal friction for easy compaction are given below.
Water content
Aggregate/cement ratio
Size of aggregate
Shape of aggregate
Grading of aggregate
Surface texture of aggregate
Use of admixture
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