There is commonly some missing information in the scientific studies researching some properties of the special concretes such as lightweight, heavyweight, self-consolidating, pre-placed aggregate, pervious etc. Are the concretes more tend to segregate (also including bleeding) than ordinary workable concrete becuase of their complex nature?
Concrete is not a homogeneous material even at macroscopic level, thus, it is not easy to define a definite border for the segregated concrete and accepteble concrete. This is why the data on the segregation or degree of homogeneity of concrete is very limited. Obviously the lack of proper test method(s) to evalute segragation plays a important role in this subject.
The scarcity of such information is a result of considering the concrete as a continuous material. Segregation of the concrete, or any material alike, can be investigated through a discrete element method (DEM) coupled with a computational fluid dynamics (CFD) to take into account the effect of cohesion.
Concrete is not a homogeneous material even at macroscopic level, thus, it is not easy to define a definite border for the segregated concrete and accepteble concrete. This is why the data on the segregation or degree of homogeneity of concrete is very limited. Obviously the lack of proper test method(s) to evalute segragation plays a important role in this subject.
You can also this paper : Correlation between Bleeding and Rheological Characteristics of Self-Compacting Concrete
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