Bleeding of Concrete
Bleeding is one form of segregation, where water comes out to the surface of the concrete, being lowest specific gravity among all the ingredients of concrete. Bleeding can be easily identified in the field by the appearance of a thin layer of water in the top surface of freshly mixed concrete.
Effects of Bleeding on Concrete
- Due to bleeding concrete loses its homogeneity.
- Bleeding is responsible for causing permeability in concrete.
- In the process of bleeding (i.e. while water is in the process of coming towards top) sometimes gets accumulated below the aggregate. This accumulation of water creates a water voids and reduces bond between the aggregate and cement past. So the strength of concrete reduces (Note: This aspect is more pronounced in case of flaky aggregates)
- Similarly, water that accumulates below the reinforcing bars, particularly below the cranked bars, reduces the bond between the reinforcement and concrete.
- If a slip form paver is used for construction of concrete pavement, the bleeding water causes very serious problems. If too much of bleeding water accumulates on the surface of pavement slab, the bleeding water flows at over the unsupported side which causes collapsing of sides.
- In pavement construction bleeding water delays surface finishing and application of curing compound.
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When the mixing ratio of fine aggregate is higher than coarse aggregate, will you term that as an effect of Bleeding when concrete is pour or place for work.
Not effect of bleeding but higher ratio of fine aggregate may cause bleeding of concrete because of its porous nature. But it can be prevented by adding cement in the same ratio to fill there voids or using low water( using plastisizer)
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Greetings,
In the third bullet, above, you mention “cement past”, a term for which I cannot find a definition. I would appreciate a definition. Is it possibly a typographical error?
Thanks for your attention.
cement paste means mixture of cement +water is called cement past.
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