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HOW TO REDUCE SEGREGATION IN CONCRETE

What Is Segregation?

The tendency of separating coarse aggregate particles from the concrete mix is known as segregation. Generally, it is observed in the plastic stage of concrete. Segregation mostly occurs in very lean and wet concrete. Honeycomb, sand streaks, porous layers, rock pockets etc are the results of segregation in hardened concrete.


Causes of Segregation In Concrete:

Different causes of segregation in concrete are as following:

1. Excessive water content in the mix.

2. Use of poor graded aggregates.

3. Improper design of the mix.

4. Poor compaction of concrete.

5. Over vibration of concrete.

How To Reduce Segregation In concrete:

Segregation can be avoided by taking following precautions.

  1. The design of the concrete mix should be done properly.
  2. Water content should not be added more than the desired amount.
  3. Handling, placing, and compaction of freshly mixed concrete should be done carefully. A proper vibration also reduces the chances of segregation.
  4. Concrete should not be dropped from more heights.
  5. Air entraining admixtures can be used to enhance the viscosity of concrete.
  6. Formwork should be always watertight to prevent leakages.

ALSO READ – How to reduce bleeding in concrete?

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Comments ( 5 )

  1. Tq for giving wonder full information

  2. pradip retharekar
    April 3, 2017 at 5:20 am

    my question concrete has already got water so curing done to stop evaporation .then what about cement bag .it doesn’t have water so why if cement bag is opened it hardens but if not cured gets cracks

    • Because it absorb the amount of water from the atmosphere and it require a small amount of water when compared to concrete that is almost 0.32 so it get hardens .. if you can remove moisture from surrounding than it doesn’t affect the cement which is not possible .

  3. A lot of useful information here. Thanks sir for your effort!

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