What is Segregation?
Wordweb dictionary defines the term “segregation” as – Separation or isolation of one thing from another and place in a group apart from others.
In concrete technology, segregation can be of two types. Firstly the coarse aggregate may separate from the main mass of concrete in its plastic state. Secondly, the grout (cement+paste) may separate from the mix. The second one is generally occurs if a concrete is too wet.
What Causes Segregation in Concrete (Theoretical Aspect)
Concrete is a mixture of aggregate, cement, water & admixture. The sizes and their specific gravities are different from each other. For example the specific gravity of most of the aggregates fall in the range between 2.6 to 2.7 and that of most of the cement is in between 3.1 to 3.2. Because of this they show a tendency to separate from each other.
The separation can be of three types as mentioned below.
- Coarse aggregate separating out or settling down from rest of the matrix (Type-1 segregation)
- The paste separating away from coarse aggregate (Type-2 segregation)
- Water being lowest in specific gravity, separating out from the rest of the material (Type-3 segregation, called Bleeding)
hw is type1 diff frm type 2>
what is the relation b/w density and cementitious properties?
How does workability of concrete affect the ultimate strength of concrete mix?
There is any method for assessing segregation? ?
Yes you can assess the segregation by physical observation.
1. Check the slump in concrete and no water should be added if the slump required is not achieved
2. concrete pouring should not be done more then 1 meter height
Do we have any known technical document (standards) about segregation of aggregates in concret? American, british, german?
very nice and helpful sir….thank you so much.
very nice sir
so helpful for me