Page 17 - Unit 2: Pavement Material

Civil Engineering Department | DCC3113 : Highway & Traffic Engineering

Aggregate Aggregate physical properties

• Aggregates can be classified by their mineral, chemical and physical properties. The
pavement industry typically relies on physical properties for performance
characterization. An aggregate’s physical properties are direct result of its mineral and
chemical properties.

• Important properties of aggregates are:

i. Strength – to withstand crushing, impact during construction and traffic load
ii. Soundness – resistance to disintegration under weathering

iii. Shape and surface texture – help in interlocking, resistance to sliding, affect strength
iv. Affinity – properly coated by binder

v. Relative density and absorption – stripping, drying time and mix design
vi. Resistance to wear (hardness) – polished under traffic, skid resistance

vii. Gradation – quality and pavement strength

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