What Is Bleeding In Concrete?

Effect of Bleeding concrete?

Prevention of bleeding in concrete

• Bleeding can be reduced with appropriate proportions and uniform and complete mixing.
• Bleeding is reduced by the use of finely divided pozzolanic materials, making a long way to cross the water.
• The air-penetrating agent is very effective for reducing blood.
• Bleeding can be reduced by the use of fine cement or cement with low alkali content.

What Is Segregation In Concrete?

Segregation Can Be of Three Types

1. Separating or excluding coarse aggregates from the rest of the matrix.
2. Separate paste from the coarse aggregate.
3. Separate water from the rest, being the material of lowest specific gravity.

Conditions Favorable for Isolation :

• Inadequately mixed concrete with excess water content
• Concrete falling from height in case of placing concrete in column concreting
• When concrete is discharged from a badly prepared mixer, or from a mixer with worn-out blades

Harmful Effects Due to the Segregation of Concrete

• To comb the concrete honey.
• The high permeability of concrete.
• Low compressive strength.
• Poor finishing of surfaces.

Control of Segregation

• By proper selection of aggregates.
• By proper handling of concrete.
• Applying controlled vibration.
• Adopting leak proof formwork.

Bleeding of Concrete

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