Page 24 - UNIT 3 - CONSTRUCTION OF FLEXIBLE PAVEMENT

Civil Engineering Department | DCC3113 : Highway & Traffic Engineering

Concept Testing

• The most suitable materials used for the sub-base are:
– The liquid limit shall be not more than 25%.

– Plasticity Index (PI) shall be not more than 6%.
– The Aggregate Crushing Value shall be not more than 35%.

– The material shall have a CBR value of 30 or more when compacted to 95% of the
MDD.

– Laterite Sand – which have CBR value > 20%
– Crushed Agg.-with the size ranging from 75mm to dust & the CBR value > 30%

– Sub-base material should fulfill the test CBR, Liquid Limits, Plastic Limits, Aggregate
Impact Value (AIV), Los Angeles Abrasion (LAA) and Sieving.

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