The excessive water in a concrete mix makes placement of concrete easy, but it also lowers the quality of the overall concrete product. The adverse effect of excessive water on concrete structures is very common and this article briefly explained to you about some of the effects of Excess Water in Concrete.
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Effects of Excess Water in Concrete Mix:
Following are some of effects caused by the presence of excess water in a concrete mix :
1) Strength Reduction
2) Drying shrinkage
3) Loss of abrasive resistance
4) Increase in permeability
5) Dusting and scaling
6) Reduced durability
1. Strength Reduction:
Compressive strength is one of major property of concrete and the excessive quantity of water reduces the compressive strength of concrete. The extra water will not involve in the hydration process and retains in concrete even after hardening.
In addition, this water may evaporate when exposed to the atmosphere and form voids in the concrete. The voids left are therefore responsible for the reduction of compressive strength of concrete.
2. Drying Shrinkage:
The drying shrinkage of concrete can caused by the excessive water. Which is responsible for making concrete weaker in tensile strength and as a result, cracks will form on the concrete surface.
3. Loss of Abrasive Resistance:
The concrete abrasive resistance is directly proportional to its strength. When excessive water available in concrete , the strength of the concrete decreases and therefore, the abrasive resistance also reduces.
After the evaporation of excess water in concrete, it make Porous cavity in hardened concrete. The Porous cavity formed will absorb water and make the concrete structure permeable.
The dusting is a defect in concrete, which seen when excess water in concrete mix brings the fine aggregate to the top, as a result, after hardening. Which left a fine loose powder and will settle on the top of the concrete surface. This effect is called dusting.
Excess water in concrete can also cause Scaling of concrete. In this effect , the top layer of the concrete surface is removed. It is happen due to the reaction of water with freeze and thaw effects
7. Reduced durability:
Above all effects ultimately lead to a reduction in the durability of concrete. Therefore, to make durable concrete, the water-cement ratio must be selected properly. Selection of low water-cement ratio helps to get more durable concrete. For more durable concrete air entraining admixtures can be used which increase durability with low water content which is shown in the graph below.
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