FLAKINESS & ELONGATION INDEX

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Aggregate Shape Indices

About Flakiness Index

Flakiness Index is the percentage by weight of particles whose least dimension is less than 0.6 times their mean dimension. This test is important for quality control of aggregates in civil engineering.

Sieve Size Range (mm) Wt. of Fraction (g) Wt. Passing Slot (g)
63.0 - 50.0
50.0 - 40.0
40.0 - 31.5
31.5 - 25.0
25.0 - 20.0
20.0 - 16.0
16.0 - 12.5
12.5 - 10.0
10.0 - 6.3
Sieve Size Range (mm) Wt. of Fraction (g) Wt. Retained in Gauge (g)
63.0 - 50.0
50.0 - 40.0
40.0 - 31.5
31.5 - 25.0
25.0 - 20.0
20.0 - 16.0
16.0 - 12.5
12.5 - 10.0
10.0 - 6.3
Flakiness Index
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Flakiness Index is the percentage by weight of particles in an aggregate sample whose least dimension is less than 0.6 times their mean dimension. A lower value indicates better aggregate quality.
Sieve Size Range (mm) Wt. of Fraction (g) Wt. Passing Slot (g) % Flaky Particles
Total: -- -- --
Error:
Elongation Index
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Elongation Index is the percentage by weight of particles in an aggregate sample whose length is greater than 1.8 times their mean dimension. A lower value indicates better aggregate quality.
Sieve Size Range (mm) Wt. of Fraction (g) Wt. Retained in Gauge (g) % Elongated Particles
Total: -- -- --
Error:

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