Table of Contents

4.5 Selection of Aggregate

Aggregate is the load bearing and wearing component of most sprayed seals. The functions of an aggregate are to:

  • spread the wheel loads to the underlying pavement
  • improve skid resistance of a road surface
  • provide surface drainage during wet weather
  • provide a durable abrasion resistant surface that will withstand traffic and weathering
  • interlock and impart stability to the treatment
  • bond to the bituminous binder.

To fulfil these functions aggregate must be derived from selected sources and have properties as described in AS 2758.2.