Per §5.3.5, between two aggregates of equal volume, which one will giv…

Question

Per §5.3.5, between two aggregates of equal volume, which one will give the higher workability of concrete?

Accepted Answer

D. {'text': 'A smooth-textured rounded aggregate', 'label': 'D'}

1. §5.3.5: 'The influence of texture on workability is again related to the total surface area which is more in case of rough textured aggregate than rounded and smooth aggregate of same volume. Hence, smooth rounded aggregate gives better workability.'
2. Rough texture pulls more paste for wetting the surface and so cuts workability.
_Source: IGNOU ET-522 Block-2 Unit-5 Workability & Fresh Concrete-I, §5.3.5, p. 7_

Answer

{'text': 'Any flat elongated aggregate', 'label': 'A'}

Answer

{'text': 'A rough-textured angular aggregate', 'label': 'B'}

Answer

{'text': 'A flaky laminated aggregate', 'label': 'C'}