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Q: The index of an aggregate is the percentage by weight of particles in it whose least dimension (thickness) is less than three-fifth of the mean dimension (not applicable for aggregates smaller than 6.3 mm), is called
  • A. Flakiness index
  • B. Elongation index
  • C. Angularity index
  • D. Soundness index
Correct Answer: Option A - Flakiness Index: The index of an aggregate is the percentage by weight of particles in it whose least dimension (thickness) is less than three-fifth of the mean dimension • The test is not applicable to size smaller than 6.3 mm. Elongation Index: The elongation index is the total weight of the material retained on the various length gauge expressed as a percentage of the total weight of the sample gauged.
A. Flakiness Index: The index of an aggregate is the percentage by weight of particles in it whose least dimension (thickness) is less than three-fifth of the mean dimension • The test is not applicable to size smaller than 6.3 mm. Elongation Index: The elongation index is the total weight of the material retained on the various length gauge expressed as a percentage of the total weight of the sample gauged.

Explanations:

Flakiness Index: The index of an aggregate is the percentage by weight of particles in it whose least dimension (thickness) is less than three-fifth of the mean dimension • The test is not applicable to size smaller than 6.3 mm. Elongation Index: The elongation index is the total weight of the material retained on the various length gauge expressed as a percentage of the total weight of the sample gauged.