Segregation

• A separation of components ( e.g. aggregates ) or fresh concrete , resuklting in a non-uniform mix 
• Contributed by : 

1.  Larger maximum particle size ( over 25mm ) and proportion of large particles 
2. A high specific gravity of the coarse aggregate to compared to that of the fine aggregates 
3. Changes in the particle shape way from smooth , well -rounded particles to odd shaped , rough particles 
4. Mixes that are too wet or dry 
5. Concrete allow to fall from greater high / 

• Can be avoid by 

- Addition of little air entraining agent 

All the operations like handling , placing and consolidation should be conducted carefully. Concrete should not allowed to fall from greater heights . 

- Concrete mix should be properly designed and should not be added with water more than the desired amount .