EFFECTS OF EXCESS WATER IN CONCRETE MIX

When we used more water in concrete means our water-cement ratio would be high then it affects adversely to the concrete. effects of excess water in concrete mix are given below.

1. Strength reduction 
2. Drying shrinkage
3. Loss of abrasive resistance
4. Increase in permeability
5. Dusting and scaling


1. Strength reduction:
compressive strength is the major property of hardened concrete and the superfluous quantity of water reduces the compressive strength of concrete. The excess water will not participate in the hydration process and retains in concrete even after hardening. This water will evaporate when exposed to atmosphere and form the voids in concrete. These voids formed are responsible for the reduction in compressive strength of concrete.

2. Drying shrinkage:
Increase in water-cement ratio will increase the drying shrinkage and concrete becomes weaker in tensile strength and as a result, cracks will form on the concrete surface.

3. Loss of abrasive resistance:.
Abrasive resistance of concrete is directly proportional to its strength when excessive water increases, the strength of concrete decreases and therefor the abrasive resistance also reduces.

4. Increase in permeability:
 The concrete becomes porous after the evaporation of excess water in hardened concrete. The voids formed will absorb water and make concrete structure permeable. It makes steel corrosion also and strength of steel will be reduced.

5. Dusting and scaling:
The excess water in concrete mix brings the fine aggregate to the top, as a result after hardening, a fine loose powder will settle on the top of the concrete surface. This process is called dusting.
Scaling of concrete also occurs due to excess water content in concrete. In this case, the top layer of the hardened concrete surface is removed. It is due to the reaction of water with freeze and thaw effect.



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