BLEEDING IN CONCRETING

Reason for bleeding

Segregation is the primary cause of bleeding in the concrete . Heavy aggregate particles go under down during segregation, which causes water to rise to the surface and form a layer. The fine cement particles are also carried by the water's upward transition. Pavements and slabs' top surfaces won't have superior wearing qualities.

The molecules bond when water and cement mix, causing a chemical reaction called hydration. This process of hydration is what sets up concrete. If the concrete mix has too much water, there may not be enough cement molecules to properly bond with all the water molecules. The extra water rises to the surface of the concrete as it sets up, forming what is known as bleed water. Excessive bleed water can negatively affect the durability and appearance of the surface of the concrete.






Minimising the possibility of concrete bleeding

  • Decreasing the water volume in concrete and Designing the concrete mix properly. 
  • Add more cementitious materials, such as fly ash.
  • Air entraining admixtures are useful for reducing bleeding.
  • Power troweling should be delayed until the bleeding stopped and the bleed water has evaporated or been removed in some other way.











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