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. It depends upon the proportioning of the mix, handling and placing operation of concrete etc.
4 Causes of Segregation
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
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.