Page 27 - Unit 2: Pavement Material

Civil Engineering Department | DCC3113 : Highway & Traffic Engineering

Type of test The objectives of tests on road construction materials

Flakiness Index (BS 812:Section 105.1 :1989)
• To determine percentage of flaky aggregate. An aggregate is considered flaky when its
thickness is less than 0.6 times its average dimension. Aggregate that needs to be tested

is between 6.3 mm and 63 mm.
• Aggregate according to the size and weight is recorded. Each aggregate is to be
inserted to the specific slot and record the weight of passing aggregate. Aggregate
passes the slot is considered flaky.

Flakiness Index (FI) = Weight pass slot x 100
Weight Original

Sample of flaky aggregate
Flakiness Index Equipment

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Prepared by : SITI ZURAIFA BINTI MD SAH, zuraifa@pmu.edu.my