What is Permeability ? Factors influencing it.
What is Permeability ?
Permeability is define as the property that control the rate of flow of fluid into a porous solid.
It depends on the size of pores connectivity of pores.
The pores relevant to permeability are minimum diameter of 120 nm and they have to be connected.
Isolated pores, pores filled with water and pores with narrow entrance and irrelevant to permeability.
FACTORS INFLUENCING PERMEABILITY
1.Water Cement Ratio:
Water Cement Ratio influence concrete permeability to a great extent, the higher the ratio the greater the concrete permeability. In the case of low ratio, the particles of cement and aggregate would not be compact. Concrete would be permeable when free water leaves the pores due to evaporation.
2.Compaction of Concrete:
When concrete is adequately compacted, air-voids and trapped bleed water in concrete are eliminated. As a result, pores and more importantly interconnected pores are avoided and eventually concrete permeability is declined.
Permeability is define as the property that control the rate of flow of fluid into a porous solid.
It depends on the size of pores connectivity of pores.
The pores relevant to permeability are minimum diameter of 120 nm and they have to be connected.
Isolated pores, pores filled with water and pores with narrow entrance and irrelevant to permeability.
FACTORS INFLUENCING PERMEABILITY
1.Water Cement Ratio:
Water Cement Ratio influence concrete permeability to a great extent, the higher the ratio the greater the concrete permeability. In the case of low ratio, the particles of cement and aggregate would not be compact. Concrete would be permeable when free water leaves the pores due to evaporation.
2.Compaction of Concrete:
When concrete is adequately compacted, air-voids and trapped bleed water in concrete are eliminated. As a result, pores and more importantly interconnected pores are avoided and eventually concrete permeability is declined.
3.Curing of Concrete:-
Curing of concrete substantially influences the permeability of concrete.
Sufficient curing allows proper cement hydration. Subsequently, pores in
concrete would be filled with hydration product.
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