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Q: The elongation index is not applicable to sizes smaller than ______.
  • A. 10 mm
  • B. 6.3 mm
  • C. 7.8 mm
  • D. 10.5 mm
Correct Answer: Option B - Flakiness Index and Elongation Index Test (IS:2386 Part I):– • Because of large number of flaky particles in the coarse agg. more voids are formed in the concrete consequently more mortar is required to fill the voids, resulting in uneconomical mix. • Also, durability of concrete will be affected. For flakiness index and elongation index sufficient quantity of agg. is taken so as to provide at least 200 pieces of any function to be tested. • The elongation and flakiness index are not applicable to sizes smaller than 6.3 mm.
B. Flakiness Index and Elongation Index Test (IS:2386 Part I):– • Because of large number of flaky particles in the coarse agg. more voids are formed in the concrete consequently more mortar is required to fill the voids, resulting in uneconomical mix. • Also, durability of concrete will be affected. For flakiness index and elongation index sufficient quantity of agg. is taken so as to provide at least 200 pieces of any function to be tested. • The elongation and flakiness index are not applicable to sizes smaller than 6.3 mm.

Explanations:

Flakiness Index and Elongation Index Test (IS:2386 Part I):– • Because of large number of flaky particles in the coarse agg. more voids are formed in the concrete consequently more mortar is required to fill the voids, resulting in uneconomical mix. • Also, durability of concrete will be affected. For flakiness index and elongation index sufficient quantity of agg. is taken so as to provide at least 200 pieces of any function to be tested. • The elongation and flakiness index are not applicable to sizes smaller than 6.3 mm.