How does water absorption affect concrete?
On the other hand, the absorption of water by aggregate from fresh concrete may enhance adhesion of cement paste to the aggregate and thus the tightness of hardened concrete. It can result in higher strength and better durability of concrete, which was revealed in some research [4, 5, 6].
How does aggregate affect workability of concrete?
The shape of aggregates affects the workability of concrete. Other than that, the round aggregates also have less surface area compared to elongated or irregular shaped aggregates. This will make less requirement of water for same workability of concrete.
What is the effect of moisture content of aggregate in concrete mixing?
Moisture Content Aggregate can contain water, both internal, based on porosity, and external, surface moisture. This gives aggregate the ability to absorb water. This will effectively reduce the amount of water available for hydration; or conversely, if the aggregate is very wet, add excess water to a cement mix.
What is the effect of absorption of aggregate on the mix design of concrete?
That is why it greatly affects the concrete mix design. Its properties such as strength, maximum size, shape, and water absorption influence water demand, the quantity of cement and fine aggregate in concrete mixture.
How does aggregate size affect water demand and cement content?
Higher the surface area, greater is the water demand to coat the particles and generate workability. Smaller maximum size of coarse aggregate would require greater fine aggregate content to coat particles and maintain cohesiveness of concrete mix.
What are the factors affecting on workability?
The Factors that Affect the Workability of Concrete are Given Below:
- Water Content of the Concrete Mix:
- The Size of Aggregates:
- The shape of Aggregates:
- Surface Texture of Aggregates:
- The Porosity of Aggregates:
- Grading of Aggregates:
- Uses of Concrete Admixtures:
- Ambient Temperature:
What is water absorption of aggregates?
Water absorption gives an idea on the internal structure of aggregate. Aggregates having more absorption are more porous in nature and are generally considered unsuitable, unless found to be acceptable based on strength, impact and hardness tests.