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Q: In which of the following methods of grading of aggregates are the samples of fine and coarse aggregates passed through nine standard sieves?
  • A. By trail
  • B. By minimum voids method
  • C. By fineness modules method
  • D. By arbitrary standards
Correct Answer: Option C - Fineness modules method : The method can be used to determine the fineness modules of coarse aggregate, fine aggregate, and all in aggregate, i.e., mixed aggregate. As per IS:383-2016 table 2, For grading of coarse aggregate the sieve (nine sieves) is taken as 80 mm, 63 mm, 40 mm, 20 mm, 16 mm, 12.5 mm, 10 mm, 4.75 mm and 2.36 mm. As per IS:383-2016 table 9, For grading of fine aggregate, the sieve (seven sieve) is taken as 10 mm, 4.75 mm, 2.36 mm, 1.18 mm, 600μ, 300μ and 150μ.
C. Fineness modules method : The method can be used to determine the fineness modules of coarse aggregate, fine aggregate, and all in aggregate, i.e., mixed aggregate. As per IS:383-2016 table 2, For grading of coarse aggregate the sieve (nine sieves) is taken as 80 mm, 63 mm, 40 mm, 20 mm, 16 mm, 12.5 mm, 10 mm, 4.75 mm and 2.36 mm. As per IS:383-2016 table 9, For grading of fine aggregate, the sieve (seven sieve) is taken as 10 mm, 4.75 mm, 2.36 mm, 1.18 mm, 600μ, 300μ and 150μ.

Explanations:

Fineness modules method : The method can be used to determine the fineness modules of coarse aggregate, fine aggregate, and all in aggregate, i.e., mixed aggregate. As per IS:383-2016 table 2, For grading of coarse aggregate the sieve (nine sieves) is taken as 80 mm, 63 mm, 40 mm, 20 mm, 16 mm, 12.5 mm, 10 mm, 4.75 mm and 2.36 mm. As per IS:383-2016 table 9, For grading of fine aggregate, the sieve (seven sieve) is taken as 10 mm, 4.75 mm, 2.36 mm, 1.18 mm, 600μ, 300μ and 150μ.