FLAKINESS & ELONGATION TEST METHOD AS PER IS 2386- PART-1

Admin October 24, 2023

AIM:-

Test method for determination of flakiness index of coarse aggregate. Asper IS:2386,(Part-1)-1963?
Sampling IS code - 2430

Read more Sieve analysis of fine aggregates

APPARATUS:-

Weight Balance accuracy of 1.0gm
Metal Flaki Gauge - 1.6mm thick metal sheet rolled over 8mm dia bar.
Sieves - IS Sieve of size shown in table.

SAMPLE:-

Approx weight of 40mm aggregate sample= 40,kg.
Approx weight of 20mm aggregate sample= 20,kg.
Minimum 200 pieces of each fraction is to be tested.

FLAKINESS INDEX:-

The Flakiness index of an aggregate is the percentage by weight of particles in the least dimension (thickness) is less than three-fifths of their mean dimension. The test is not applicable to size smaller than 6.3mm.

PROCEDURE:-

First sieving the test sample properly in accordance with the method described,
Take weight of the sample retained on each sieve.
Then calculate the percentage retained on each sieve & cumulative percentage retained on all sieve.
Collect 200 no's of pieces from the aggregate retained on each sieve.
Then each fraction is to be gauged through thickness on the standard metal thickness gauge & then aggregate. Passing on gauge for each fraction then separately counted.

CALCULATIONS:-

Read More IMPACT VALUE TEST METHOD

AIM:-

Test method for determination of Elongation index of coarse aggregate. Asper IS:2386,(Part-1)-1963?
Sampling IS code - 2430

APPARATUS:-

Weight Balance accuracy of 1.0gm.
Metal Elongation Gauge.
Sieves - IS Sieve of size shown in table.

ELONGATION INDEX:-

The elongation Index of an aggregate is the percentage by weight of particles whose greatest dimension (Length) is greater than one and four-fifths times their mean dimension. The elongation tests is not applicable to sizes smaller than 6.3mm.

PROCEDURE:-

First sieving the test sample properly in accordance with the method.
Take weight of the sample retained on each sieve.
Collect 200 no's of pieces from the aggregate retained on each sieve.
Then each fraction is to be gauged through on the standard metal length gauge & then aggregate. Retained on gauge for each fraction then separately counted.

CALCULATIONS:-

RESULTS:-

Combined flakiness and Elongation Index = FI + El.

Specified Limit:-

Building stacture= 40% (Max)

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