Page 28 - Unit 2: Pavement Material

Civil Engineering Department | DCC3113 : Highway & Traffic Engineering

Type of test The objectives of tests on road construction materials

Elongation Index (BS 812 :part 1 :1975)
• To determine percentage of elongated aggregate. An aggregate is considered
elongated when its thickness is more than 1.8 times its average dimension. Aggregate

that needs to be tested is between 6.3 mm to 63 mm
• Aggregate according to size and weight is recorded. Each aggregate is to be inserted to
the specific slot and record the weight of retained aggregate. Aggregate retained the
slot is considered elongated

Elongation Index (FI) = Weight retained slot x 100
Weight Original

Sample of elongated aggregate

Elongation Index Equipment

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