Concrete Segregation Causes and Types

Segregation in concrete can occur during the mixing, transporting, placing, or compacting stages, leading to weaker and less durable concrete.

Fine segregation in concrete happens when there is an excess of fine aggregate and not enough coarse aggregate in the mix.

Concrete should be mixed in a transit mixer for at least two minutes before discharge to avoid segregation.

Excessive compaction or an excessive quantity of water in the concrete mix can lead to bleeding on the surface of the freshly laid concrete.

Increasing water content in concrete decreases bleeding.

Good consolidation of concrete helps achieve a less dense and less durable concrete.

Bleeding in concrete stops when the concrete has set.

Amount of bleeding in concrete is not affected by the depth of the concrete placed.

In concrete, honeycombs &/or pockets may be visible if the concrete mix has low water content.

Increasing the water/cement ratio can help improve the workability of concrete.

The slump range of 25 - 50 mm corresponds to a compacting factor of 0.85 and is suitable for reinforced concrete with high reinforcement.

Concrete segregation occurs when the coarse and fine aggregate, and cement paste, are well mixed together.