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Q: An ordinary Portland cement when tested for its fineness, should not leave any residue on I.S. Sieve No. 9, more than ...........
  • A. 5%
  • B. 10%
  • C. 15%
  • D. 20%
Correct Answer: Option B - A good portland cement when tested for fineness, the percentage of residue left after sinking in sieve should not exceed 10%. Fineness test – (i) By sieving (ii) By Blaine's air permeability apparatus (Material) • The fineness cement is measured in term of surface area in cm²/gm of the cement by Blaine's air permeability test.
B. A good portland cement when tested for fineness, the percentage of residue left after sinking in sieve should not exceed 10%. Fineness test – (i) By sieving (ii) By Blaine's air permeability apparatus (Material) • The fineness cement is measured in term of surface area in cm²/gm of the cement by Blaine's air permeability test.

Explanations:

A good portland cement when tested for fineness, the percentage of residue left after sinking in sieve should not exceed 10%. Fineness test – (i) By sieving (ii) By Blaine's air permeability apparatus (Material) • The fineness cement is measured in term of surface area in cm²/gm of the cement by Blaine's air permeability test.