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Q: Air permeability method is used to determine :
  • A. Soundness of cement
  • B. Setting time
  • C. Fineness of cement
  • D. Resistance of cement
Correct Answer: Option C - Fineness Test– The degree of fineness of cement is the measure of the mean size of the grains in it. There are three methods for testing fineness : (i) The sieve method (using 90 micron sieve) (ii) Air permeability method (Nurse and Blains method) (iii) Sedimentation method (Wagner Turbidimeter method) The last two methods measures the surface area, whereas the first measures the grain size. Soundness Test–The ability of cement to retain its volume after it gets hardened. There are two methods available for testing soundness: (i) Autoclave Method (ii) Le-chatelier Method Setting Time Test– It is the time required for stiffening of cement paste to a defined consistency. Setting time test is performed on Vicat’s Apparatus. Resistance Test– Penetration resistance test is conducted on concrete structures using Windsor Probe test machine.
C. Fineness Test– The degree of fineness of cement is the measure of the mean size of the grains in it. There are three methods for testing fineness : (i) The sieve method (using 90 micron sieve) (ii) Air permeability method (Nurse and Blains method) (iii) Sedimentation method (Wagner Turbidimeter method) The last two methods measures the surface area, whereas the first measures the grain size. Soundness Test–The ability of cement to retain its volume after it gets hardened. There are two methods available for testing soundness: (i) Autoclave Method (ii) Le-chatelier Method Setting Time Test– It is the time required for stiffening of cement paste to a defined consistency. Setting time test is performed on Vicat’s Apparatus. Resistance Test– Penetration resistance test is conducted on concrete structures using Windsor Probe test machine.

Explanations:

Fineness Test– The degree of fineness of cement is the measure of the mean size of the grains in it. There are three methods for testing fineness : (i) The sieve method (using 90 micron sieve) (ii) Air permeability method (Nurse and Blains method) (iii) Sedimentation method (Wagner Turbidimeter method) The last two methods measures the surface area, whereas the first measures the grain size. Soundness Test–The ability of cement to retain its volume after it gets hardened. There are two methods available for testing soundness: (i) Autoclave Method (ii) Le-chatelier Method Setting Time Test– It is the time required for stiffening of cement paste to a defined consistency. Setting time test is performed on Vicat’s Apparatus. Resistance Test– Penetration resistance test is conducted on concrete structures using Windsor Probe test machine.