Per §5.5, segregation in fresh concrete refers to:

Question

Accepted Answer

A. {'text': 'The separation of components, producing a non-uniform mix', 'label': 'A'}

1. §5.5 opens: 'Segregation refers to a separation of the components of fresh concrete resulting in a non-uniform mix.' Three types are listed: coarse aggregate settling out of the paste, paste/matrix separating from aggregate, and water (lowest specific gravity) separating from the rest.
2. Mixing too wet, over-vibration, dropping concrete from height, transporting too long are listed as encouraging conditions.
_Source: IGNOU ET-522 Block-2 Unit-5 Workability & Fresh Concrete-I, §5.5, p. 14_

Answer

{'text': 'Hardening of cement after setting time begins', 'label': 'B'}

Answer

{'text': 'The reaction of alkalies with reactive silica in aggregate', 'label': 'C'}

Answer

{'text': 'The water filling the gel pores during curing', 'label': 'D'}