alleryStart learning →Per §5.5, segregation in fresh concrete refers to:
AThe separation of components, producing a non-uniform mix
BHardening of cement after setting time begins
CThe reaction of alkalies with reactive silica in aggregate
DThe water filling the gel pores during curing
Answer & Solution
Correct answer: A. The separation of components, producing a non-uniform mix
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_
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