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Procedure for Determination Fineness of Cement

Er. Parbhakar Dwivedi
0
 

       

Theory:

Strength development of concrete is the result of the reaction of water with cement particles. The reaction always starts with the cement available at the surface of the particles. Thus, larger the surface area available for reaction greater is the rate of hydration. Rapid development of Strength requires greater degree of fineness. Rapid Hardening cement, therefore, requires greater degree of fineness.

However, too much fineness is also undesirable, because the cost of grinding the cement to higher fineness is considerable. Finer cement deteriorates more quickly when exposed to air and likely to cause more shrinkage, but less prone to bleeding. Greater fineness also requires greater amount of gypsum for proper retardation. Also amount of water requirement for the pasts of standard consistency is greater.

It is, therefore, necessary to ensure certain amount of coarseness is the cement, but maximum limit to this coarseness is prescribed by BIS to ensure minimum degree of grinding.

Aim: To Determine the Fineness of Cement

Significance: The Fineness of Cement has an important bearing on the rate of hydration and hence on rate of gain of strength and rate of evolution of heat Finer cement offers a greater surface area for hydration and hence the faster and greater the development of Strength

Definition: The area of cement particles of particular cement weight

Apparatus:

  • IS sieve- 90 micron
  • Pan
  • Balance & weight

Procedures:

  • Weigh correctly 100 grams of cement (W1) gm
  • Take sample on an IS 90 micron Sieve
  • Break down the air set lumps
  • Sieve the sample giving circular and vertical motion
  • Continuously for 15 minutes
  • Weigh the residue left on sieve (W2)
Sample Wt ofSample Wt of theResidue PercentageResidue Average / Percentage Sign of QA/QC Random Check & sign ofPM/CM
W1 (gm) W2 (gm) (W2/W1) x 100
1
2

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

FORMAT FOR FINENESS TEST OF CEMENT IN SEPARATE TOPICS

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