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Q: The aggregate which is obtained from the seashore or rivers and produces minimum voids in the concrete is known as ........
  • A. Angular aggregates
  • B. Flaky aggregates
  • C. Irregular aggregates
  • D. Rounded aggregates
Correct Answer: Option D - • Rounded aggregate with rounded shape has the minimum percentage of voids ranging from 32 to 33%. It gives good workability for the given amount of water and hence needs less cement for a given water cement ratio. • Angular aggregate with angular shape has the maximum percentage of void ranging from 38 to 45%. • Irregular or partly rounded aggregate has higher percentage of voids ranging from 35 to 37%. • The aggregate is said to be flaky when its least dimension is less the 3/5th (or 60%) of its mean dimension.
D. • Rounded aggregate with rounded shape has the minimum percentage of voids ranging from 32 to 33%. It gives good workability for the given amount of water and hence needs less cement for a given water cement ratio. • Angular aggregate with angular shape has the maximum percentage of void ranging from 38 to 45%. • Irregular or partly rounded aggregate has higher percentage of voids ranging from 35 to 37%. • The aggregate is said to be flaky when its least dimension is less the 3/5th (or 60%) of its mean dimension.

Explanations:

• Rounded aggregate with rounded shape has the minimum percentage of voids ranging from 32 to 33%. It gives good workability for the given amount of water and hence needs less cement for a given water cement ratio. • Angular aggregate with angular shape has the maximum percentage of void ranging from 38 to 45%. • Irregular or partly rounded aggregate has higher percentage of voids ranging from 35 to 37%. • The aggregate is said to be flaky when its least dimension is less the 3/5th (or 60%) of its mean dimension.