Civil Engineering

Segregation of Concrete

Segregation can be defined as the separation of constituent materials of the concrete mix so that the mix is no longer in a homogeneous condition.
Segregation depends upon the proportioning of the mix, handling and placing operation of concrete etc.

4 Causes of Segregation in Concrete

Segregation may take place under the following circumstances(4 causes):
  1. If the proportioning of the mix is improper
  2. If the height of drop of concrete is more.
  3. If the use of the vibrator is continued for a long time.
  4. If the handling, transportation, placing, compacting and finishing of concrete work is not done in a proper way.

5 Prevention of Segregation in Concrete

A  reliable concrete is one in which all the components are well distributed to make a homogeneous mixture. A sample of concrete exhibits the tendency for segregation, such concrete becomes unsuitable.
The tendency for segregation can be minimized by taking the following prevention:
  1. Proper proportioning the mix.
  2. Reducing the height of the drop of concrete.
  3. Restricting the use of a vibrator for spreading a heap of concrete over a large area.
  4. Reducing the continuing vibration over a long time.
  5. Adopting proper handling, transporting, placing, compacting and finishing of concrete.

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