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Segregation of Concrete | Causes & Prevention of Segregation

In this Civil Experience article, you learn in deep about What is segregation of concrete, Types of SegregationCauses of Segregation in Concrete (Why Segregation occurs in Concrete), What are the effects of segregation in concrete and How can we prevent concrete segregation (remedy for segregation)

    What is Segregation of Concrete?

    Segregation meaning - “Define segregation of concrete as the way like separating of the material of concrete mixture and convert into the non-homogeneous condition” we can consider it as a segregation definition

    We need stable homogeneous concrete mix which is able to fully compact and provide better result

    Segregation of Concrete | Causes & Prevention of Segregation
    Segregation of Concrete | Causes & Prevention of Segregation

    Because Most of the engineer confuse about what is meant by segregation of concrete and bleeding so we learn you all about segregation today

    Types of Segregation in Concrete

    There are Three Types of Segregation face in the construction field
    1. The paste separating out from the mortar/concrete generally arise in wet mix conditions
    2. Water separating out from the concrete normally facing this problem in excess use of water and be the reason for lower specific gravity
    3. The courage aggregate separating out from the concrete mix/mortar normally occurs in a dry mix case

    We obtained stable, cohesive and also homogeneous concrete mix by using various consideration like size, shape, grading and surface texture of aggregate with optimum w/c ratio (water-cement ratio) so that concrete not affected by segregation

    Because cohesive property means particle makes the bond between surrounding particle so that particle (aggregate) does not allow to separate out from the concrete mixture at the end to result in we eliminate segregation

    Why Segregation occurs in Concrete

    There are lots of factors that affect segregation but I Explain about most commonly be a reason of causes of segregation of concrete in below

    Factors Affecting Segregation of Concrete

    1. High W/C ratio – excess use of water during the making of cement concrete
    2. Wrong proportion use in concrete mix – in which sufficient cement paste (slurry) is not available in sufficient quantity to bind and contain particle (aggregate)
    3. Casting from to height – during the casting concrete drop from high height more than 1.5 meters in case of casting/placing of concrete in column
      • What is the scientific reason behind this?
      • The specific gravity of every ingredient of concrete is different. So when concrete is placed/drop from a height then the ingredient which has higher specific gravity fall first compare to a particle that has lower specific gravity end of result segregation happened in the mix
      • Ingredient of concrete

        Specific gravity

        Cement

        3.15

        Coarse aggregate

        2.68

        Fine aggregate

        2.65

        Water

        1

    4. Wrong reinforcement/formwork placing in design which is the reason for discharging concrete
    5. Passing concrete along a slope, especially with a change of direction so segregation arises
    6. Concrete shows a tendency for segregation when badly designed mixer placing
    7. When concrete discharged by using worn-out blades concrete mix shows chances for segregation
    8. Segregation occurs during also when transport/conveyance concrete to the Place of casting by conveyor belts, wheel borrow, long lift by hoist and skip and long-distance haul by damper also increase chances of segregation of the concrete mix
    9. Over vibrate – use of a vibrator is excellent but excess use is harmful when vibrator use in over/excess/long time then aggregate place at bottom and cement paste come to the top surface which called segregation
    10. Unskill Masons are likely to use too must tamping, vibrator or float immediately on placing concrete to achieve a smooth surface after casting within no time which leads to aggregate place at the bottom and slurry bring top causes plastic shrinkage cracks and scum/laitance

    How to reduce Segregation in Concrete

    How to Prevent Segregation of concrete is the most common quarry which is solving here 

    We prevent concrete segregation by taking the following precautions which are described below
      1. Take care of the correct proportion mix design used
      2. Use of certain admixture workability agent, which make the concrete mix cohesive so that its help in reducing segregation
      3. By using an air-entraining agent which greatly helps in reduces segregation
      4. By reducing the height of concrete placing – must read this article Guideline for Construction Process of RCC Column
      5. Be careful and focus during concreting and avoid the horizontal flow of concrete in casting and also avoid obstruction
      6. Proper use of vibrator – labour mostly like a vibrator to spread concrete but stop them because excess use of vibrator greatly lead to segregation

      What to do if segregation occurred?

      • If coarse particle separate from mix may be corrected by adding a small quantity of water which help in improves cohesion if the concrete mix
      • If segregation have been seen at any stage then remixing for a short time to make the concrete again homogeneous state
      To know about the segregation of concrete in Hindi please watch the video


      FAQ 1: What is Segregation of Concrete?

      Define segregation of concrete as the way like separating of the material of concrete mixture and convert into the non-homogeneous condition

      FAQ 2: What is Types of Segregation in Concrete

      1. The paste separating out from the mortar/concrete generally arise in wet mix conditions 2. Water separating out from the concrete normally facing this problem in excess use of water and be the reason for lower specific gravity 3. The courage aggregate separating out from the concrete mix/mortar normally occurs in a dry mix case

      FAQ 3: What to do if segregation occurred?

      1. If coarse particle separate from mix may be corrected by adding a small quantity of water which help in improves cohesion if the concrete mix 2. If segregation have been seen at any stage then remixing for a short time to make the concrete again homogeneous state

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