FINENESS TEST OF CEMENT

FINENESS TEST OF CEMENT 

AIM:

        To determine the fineness of cement.

90 micron sieve

APPARATUS REQUIRED:

  • IS: 90 micron sieve 
  • Weighing balance 
  • Brush 
  • Tray & Trowel
  • Stopper jar

SAMPLE:

The cement taken should be finely ground material which of addition of requisite quantity of water is capable of hardening both under water and in air by the chemical interaction of its constituents with water and capable of binding together the appropriate materials. (Reference IS: 3535 - 1986)

PROCEDURE: 

  1. Agitate the sample of cement to be tested by shaking for 2minutes in a stopper jar
  2. Stir the resulting powder gently by using a clean rod in order to distribute the fineness throughout the cement.
  3. Weigh approximately 10g of cement to the nearest 0.01g and place it on the sieve (W1)
  4. Agitate the sieve by swirling, planetary and linear movement until no fine material passes through it.
  5. Remove and weigh the residue (R1) 
  6. Repeat the procedure using a fresh sample of 10g of cement to the nearest 0.01g and place it on the sieve (W2)
  7. Agitate the sieve by swirling, planetary and linear movement until no fine material passes through it.
  8. Remove and weigh the residue (R2)
  9. Calculate the residue of cement R as the mean of R1 and R2

NOTE: when the result of R1 and R2 differs more than 1% carryout a third sieving (R3) and calculate three mean values.

OBSERVATION: 

Weight of the cement sample W1 = 10g

OBS No.

Weight of the cement (W) in g

Weight of residue (R) in g

Percentage of residue

1

10

 

 

2

10

 

 

Mean Value for % of residue

 

 

CALCULATION:

Residue of cement R = (R1+R2) / 2

Percentage of Residue =  (Weight of residue retain on the sieve)/(weight of the sample) *100

NOTE:

Acceptable value – Percentage of Residue should not be more than 10%

REFERENCE:

IS: 4031 (PART-1) – 1996.



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