Determination of fineness of Cement

Dnyan Deshmukh

Staff member
Determination of fineness of Cement
Ref : IS 4031- (Part I)

Purpose : To Determine the fineness of cement

Significance : The fineness of cement has an important bearing on the rate of hydration and hence and rate of gain of strength and rate of evaluation of heat. Finer cement offers a greater surface area for hydration and hence the faster and grater the development of strength.

Definition : The area of cement particles of particular cement weight.

Apparatus :

IS sieve no.9 (90 microns)

Pan

Balance & Weights

Procedures :

Weigh correctly 100gms of cement (W1) gm.

Take sample on a IS 90 micron sieve

Brake down the air set lumps.

Sieve the sample giving circular and vertical motion continuously for 15 minutes.

Weigh the residue left on sieve (W2)

Calculation : Fineness of cement = (W2/W1) x 100



Observation Table :

fine observation table.png
Limit: As per IS 269 -1976 the residue by weight on IS test sieve no.9 is not exceed 10% for Ordinary Portland cement.

Frequency: For each batch received at site.
 

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