Page 46 - Unit 2: Pavement Material

Civil Engineering Department | DCC3113 : Highway & Traffic Engineering

Explain the objectives and characteristics
AC Mix
of asphaltic concrete mix

An asphalt concrete mixture must be designed, produced and placed in order to obtain
the following desirable mix properties:

• Stability - is its ability to resist shoving and rutting under loads (traffic).
• Durability - it is the resistance against abrasion and weathering. Impermeability -
Impermeability is the resistance of an asphalt pavement to the passage of air and
water into or through it.
• Workability – it is measure of ease with which a bituminous mix can be laid and
compacted. This property is a function of the aggregate grading, shape of particles,
texture of particles, type of bitumen used, and bitumen content.
• Flexibility – this property of the mix measures the capability of the surface in bending,
without shearing and cracking.

• Fatigue Resistance - is the pavement’s resistance to repeated bending under wheel
loads (traffic).
• Skid Resistance - Skid resistance is the ability of an asphalt surface to minimize skidding
or slipping of vehicle tires, particularly when wet.

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