TEST METHOD OF FLAKINESS & ELONGATION INDEX OF AGGREGATE

## METHOD OF FLAKINESS & ELONGATION INDEX TEST OF AGGREGATE

Determination of flakiness & elongation index (FI & EI) of coarse aggregate using thickness & length gauge. Shape and size aggregate is one of the major contributing factors to the quality of concrete. The test methods are given below for flakiness & elongation index of coarse aggregate.

Test standard : IS 2386-Part I: 1963

## Test Appratus flakiness & elongation index

• Weighing Balance
• IS sieves 63mm, 50mm, 40mm, 31.5mm, 25mm, 20mm, 16mm, 12.5mm, 10nm, 6.3mm
• Thickness gauge for flakiness and length gauge for elongation.

## Test procedure for FI & EI

#### Prepared the sample of Each fraction as:

1. Passing 63mm IS Sieve & Retained on 50mm IS Sieve
2. Passing 50mm IS Sieve & Retained on 40mm IS Sieve
3. Passing 40mm IS Sieve & Retained on 31.5mm IS Sieve
4. Passing 31.5mm IS Sieve & Retained on 25mm IS Sieve
5. Passing 25mm IS Sieve & Retained on 20mm IS Sieve
6. Passing 20mm IS Sieve & Retained on 16mm IS Sieve
7. Passing 16mm IS Sieve & Retained on 12.5mm IS Sieve
8. Passing 12.5mm IS Sieve & Retained on 10mm IS Sieve
9. Passing 10mm IS Sieve & Retained on 6.3mm IS Sieve
• Take test sample (Minimum number of 200 pieces ) on any fraction to be tested.
• Weigh the sample on each sieve fraction
• Pass the sample of each fraction (Each piece) through respective sizes on thickness gauge.
• Weigh the sample passed in each size of the thickness gauge and Note it.

Flakiness Index (%) = 100x (Total weight of sample passed in each size of thickness gauge / Total weight of sample )

• Collect all material retained on thickness gauge
• Note the weight of each size fraction.
• Pass the pieces on each fraction through respective sizes in the length gauge manually.
• Weigh the sample passed in each size of the length gauge and note it.

Elongation Index (%) = 100x Total weight of sample retained in each size of length gauge / Total weight of sample gauged (i.e retained on thickness gauge)