FINENESS TEST OF CEMENT
(IS: 269-1989 and IS: 4031-1988)
AIM: To Find the fineness of the given sample of cement by sieving.
APPARATUS:
IS-90 micron sieve conforming to IS: 460-1965, standard balance, weights, and brush.
INTRODUCTION:
The fineness of cement has a significant bearing on the rate of hydration and subsequently on the rate of the addition of strength and furthermore on the pace of advancement of hydration. Better cement offers a more prominent surface territory for hydration and henceforth the quicker and more noteworthy the advancement of solidarity. An increment in fineness of cement is additionally found to build the drying shrinkage of cement. The fineness of cement is tried either by sieving or by the assurance of Specific surface via air-penetrability mechanical assembly. Specific surface is the all-out surface region of the apparent multitude of particles in a single gram of cement
FINENESS BY SIEVING:
PROCEDURE:
1. Weigh precisely 100 g of concrete and place it on a standard 90 micron IS sieve
2. Separate any air-set lumps in the cement sample with fingers.
3. Consistently sieve the sample giving circular and vertical movement for a time of 15 minutes.
4. weigh the residue left on the sieve. According to IS code, the rate residue should not surpass 10%.
PRECAUTIONS:
Air set lumps in the cement sample are to be squashed utilizing fingers and not to be squeezed with the sieve Sieving will be finished holding the sieving in two hands and with delicate wrist movement. Pretty much constant revolution of the sieve will be completed all through sieving.
OBSERVATIONS:
|
S. No |
weight of sample taken(g) |
weight of residue(g) |
Fineness (%) |
|
1. |
|
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2. |
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3. |
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The average fineness of cement =
RESULT: Fineness of the given sample of cement =
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