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Q: Which of the following statement is INCORRECT about the grading limits of fine aggregate?
  • A. There are 3 grading zones as per IS 383-2016.
  • B. IS 383 defines the grading zones of fine aggregates.
  • C. Zone III corresponds to finer sand then Zone II.
  • D. Zone II corresponds to normal sand.
Correct Answer: Option A - As per IS 383:2016, clause 6.3, the grading of fine aggregate, when determined as described in IS 2386 (Part I) shall be within the limits described as fine aggregate, grading zone I, II, III and IV. • As the fine aggregate grading becomes progressively finer, that is from grading zones I to IV, the ratio of fine aggregate to coarse aggregate should be progressively reduced. • The fine aggregate confirming to grading zone IV should not be used in reinforced concrete unless tests have been made to ascertain the suitability of proposed mix proportions.
A. As per IS 383:2016, clause 6.3, the grading of fine aggregate, when determined as described in IS 2386 (Part I) shall be within the limits described as fine aggregate, grading zone I, II, III and IV. • As the fine aggregate grading becomes progressively finer, that is from grading zones I to IV, the ratio of fine aggregate to coarse aggregate should be progressively reduced. • The fine aggregate confirming to grading zone IV should not be used in reinforced concrete unless tests have been made to ascertain the suitability of proposed mix proportions.

Explanations:

As per IS 383:2016, clause 6.3, the grading of fine aggregate, when determined as described in IS 2386 (Part I) shall be within the limits described as fine aggregate, grading zone I, II, III and IV. • As the fine aggregate grading becomes progressively finer, that is from grading zones I to IV, the ratio of fine aggregate to coarse aggregate should be progressively reduced. • The fine aggregate confirming to grading zone IV should not be used in reinforced concrete unless tests have been made to ascertain the suitability of proposed mix proportions.