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TechConsults SK 50
General
IS: – 2386 (Part – I) 2016 Method of test for aggregates for Concrete – Particle Size and Shape (Coarse aggregates)
The flakiness index of an aggregate is the percentage by weight of particles in it whose least dimension (thickness) is less than three-fifths of their mean dimension. (The test is not applicable to sizes smaller than 6.3 mm).
This method covers the determination the flakiness of the coarse aggregate.
Procedure for flakiness test
The sample size is taken and is sieved through IS Sieve (63, 50, 40, 31.5, 25, 20, 16, 12.5, 10 and 6.3) mm.
Minimum 200 pipes of each fraction (such as passing 50 mm and retained on 40 mm and so on) to be tested are taken and weighed (as W 1, W 2,———- gm.).
Separate the flaky material by using the standard flakiness gauge as shown below:
Take the weight of flaky material which passes through standard gauge for each fraction such as w1, w2, ——-gm.
Flakiness Index (FI) | = | Weight of all fraction material passing the gauge | x 100 | |
Total weight of all fractions sample |
Flakiness Index Test Format
The workability of fresh concrete, pumping of concrete, and the strength of cement concrete are adversely affected by shape of particles. Flaky aggregates are avoided and should not exceed 15 percent .
Additional Links
Cementitious and Supplementary Cementitious Material Characteristics
OPCC Characteristics
PPC Characteristics
Fly Ash Characteristics
GGBFS Characteristics
Micro Silica Characteristics
Cementitious and Supplementary Cementitious Material – Cement Tests
Consistency of Cement Test
Initial Setting Time and Final setting Time of Cement Test
Soundness of Cement Test
Cement Compressive Strength Test
