Pavement

The properties required of aggregate may be varied according to the intended type of treatment and traffic conditions. In general, higher quality aggregate is required for heavy traffic conditions (e.g. areas of high stress) and in treatments expected to have a long service life.

The suitability of aggregates may be evaluated by a series of Australian Standard tests (AS 1141: Methods for Sampling and Testing Aggregates) or in road agency test methods. Typical limits for these tests for sprayed seals are given in AS 2758.2 and road agency specifications. Information on the use of slag materials is given in Roads and Traffic Authority (1993). Other manufactured materials such as calcined bauxite are often supplied as proprietary materials for specific purposes and specifications vary. Expert advice should be sought on these materials.