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Q: Which of the following is used to test the fineness of a cement?
  • A. Air-content method
  • B. Air-permeability method
  • C. Le-Chatelier apparatus
  • D. Vicat's apparatus
Correct Answer: Option B - Fineness test on cement is carried out to check, proper grinding of cement. Fineness test for cement particles may be determined by following methods– (i) Sieve test : This test is obsolete in practice. In this cement sample of 100 gm is passed continuously for 15min through standard BIS sieve number 9. (ii) Air permeability method : In this specific surface area of cement particle is calculated. (iii) Wagner turbidimeter ; I measures specific surface area.
B. Fineness test on cement is carried out to check, proper grinding of cement. Fineness test for cement particles may be determined by following methods– (i) Sieve test : This test is obsolete in practice. In this cement sample of 100 gm is passed continuously for 15min through standard BIS sieve number 9. (ii) Air permeability method : In this specific surface area of cement particle is calculated. (iii) Wagner turbidimeter ; I measures specific surface area.

Explanations:

Fineness test on cement is carried out to check, proper grinding of cement. Fineness test for cement particles may be determined by following methods– (i) Sieve test : This test is obsolete in practice. In this cement sample of 100 gm is passed continuously for 15min through standard BIS sieve number 9. (ii) Air permeability method : In this specific surface area of cement particle is calculated. (iii) Wagner turbidimeter ; I measures specific surface area.