What is Bleeding in Concrete and its Effect

Srinivasan

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What is Bleeding in Concrete and its Effect
Concrete Bleeding is predicted but if it is extreme it may cause issues. This following text will clarify Bleeding in detail.

What is Concrete Bleeding?
Bleeding in fresh concrete is the process in which free water throughout the mix is pushed upward to the surface because of settlement of heavier particles similar to cement and water. Bleeding of the water continues till the cement paste has hardened enough to finish the sedimentation process
The largest factor in bleed water is the water-to-cement ratio. An Increased ratio can result in extreme bleeding. The cement type and fine aggregates can play an important role in figuring out the bleed rate. The less fines you’ve in your mix, the more bleeding will happen. Factors also include concrete height and strain. The connection between bleed water and concrete heights begins off as linear, however ultimately turns into nonlinear at elevated heights.

Effects caused by Concrete Bleeding
  • As a result of bleeding concrete loses its homogeneity.
  • Bleeding is liable for inflicting permeability in concrete.
  • Bleeding can sometimes reduce the bond between cement paste and aggregate. In this process bleed water accumulates under the aggregate creating voids resulting in reduction in strength of bond between cement paste and aggregate. This process results in reduction of concrete strength.
  • Similarly, water that accumulates beneath the reinforcing bars, notably under the cranked bars, reduces the bond between the reinforcement and concrete.
  • If a slip type paver is used for building of concrete pavement, the bleeding water can cause critical issues. If an excessive amount of of bleeding water accumulates on the surface of pavement slab, it can lead to collapse of sides.
  • In pavement construction bleeding water is one of the causes of delayed surface finishing and curing compound application.