Fineness of Cement –
– The Fineness of Cement is measured by :
(a) Sieve Method – In this method, 100 gm cement is taken and sieved in sieve no-9 (90 micron) for 15 minutes and residue on the sieve is measured. The percentage of residue by weight on the sieve is given below.
|Type of Cement||Percentage of residue by weight|
|1. RHC (Rapid hardening Cement)||5|
|2. PPC (Portland Pozzolana Cement)||5|
|3. OPC (Ordinary Portland Cement)||10|
(b) Air permeability Method – In this method, Blaine’s air permeability apparatus is used to measure fineness of cement. It is represented in terms of specific surface area per unit weight.
|Type of Cement||Specific Surface Area (cm²/gm)|
|1. SSC (Super Sulphate Cement)||4000|
|2. RHC (Rapid hardening Cement)||3250|
|3. PPC (Portland Pozzolana Cement)||3000|
|4. OPC (Ordinary Portland Cement)||2250|
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