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In discussing workable concrete in general terms, it was stated that such concrete should not easily segregate, i.e. it ought to be cohesive. However, strictly speaking, the absence of a tendency to segregate is not included in the definition of a workable mix. Nevertheless, the absence of appreciable segregation is essential as full compaction of a segregated mix is impossible.

Segregation can be defined as separation of the constituents of a heterogeneous mixture so that their distribution is no longer uniform. In the case of concrete, it is the differences in the size of particles and in the specific gravity of the mix constituents that are the pr...