Flakiness index is defined as the percentage by weight of the particles in it whose thickness is less than three- fifths (0.6 times) of their mean dimension.
- This test is conducted to determine the thickness of the aggregates.
- This test can help to prevent structural failures and ensure long -term safety and stability of civil engineering projects and building structures.
- The specifications for this test are given in IS : 2386 Part I 1963 Particle size and shape.
Flakiness index test
Procedure
- A metal thickness gauge is the instrument used to conduct this test.
- A sufficient quantity of aggregate is taken such that a minimum 200 pieces of any fraction is tested.
- The sample is sieved through IS sieves as given below.
- The total amount passed in the gauge is measured and weighed.
Dimensions of thickness and length gauge
![Flakiness index is defined as the percentage by weight of the particles in it whose thickness is less than three- fifths (0.6 times) of their mean dimension. image 23](https://civilenggblitz.com/wp-content/uploads/2023/05/image-23.png)
FLAKINESS INDEX
![Flakiness index is defined as the percentage by weight of the particles in it whose thickness is less than three- fifths (0.6 times) of their mean dimension. flakiness](https://civilenggblitz.com/wp-content/uploads/2023/05/flakiness-index.png)
Elongation Index test
Elongation index is defined as the percentage by weight of the particles in it whose length is greater than 1.8 times of their mean dimension.
- This test is conducted to determine the length of the aggregates.
- When under pressure, materials having a high elongation index are more likely to distort or fracture, endangering the safety of structures.
- Civil engineers may make sure the materials they choose are high quality and appropriate for their intended applications by keeping an eye on the elongation index of aggregate materials.
- The specifications for this test are given in IS : 2386 Part I 1963 Particle size and shape.
![Flakiness index is defined as the percentage by weight of the particles in it whose thickness is less than three- fifths (0.6 times) of their mean dimension. elongation](https://civilenggblitz.com/wp-content/uploads/2023/05/elongation-index.png)
Procedure
- A metal length gauge is the instrument used to conduct this test.
- A sufficient quantity of aggregate is taken such that a minimum 200 pieces of any fraction is tested.
- The sample is sieved through IS sieves as given below.
- The total amount retained on the gauge length is weighed.
Elongation Index
![Flakiness index is defined as the percentage by weight of the particles in it whose thickness is less than three- fifths (0.6 times) of their mean dimension. image 24](https://civilenggblitz.com/wp-content/uploads/2023/05/image-24.png)