Surfacing selection in pavement applications where high horizontal stresses are expected presents a significant challenge where the extent of the vehicle-pavement stress is unknown and the capacity for each candidate treatment to resist these stresses is poorly defined. As vehicle loads increase, the establishment of objective surfacing selection criteria based on knowledge of the actual vehicle-pavement interaction and appropriate surfacing properties becomes an attractive objective. This paper describes the progress achieved in the development of a selection criteria for surfacings used in areas of high vehicle initiated horizontal stress. To support the recommendations, information on a laboratory test used to assess surfacing response is described along with the contributions of key material properties. To provide guidance on the capacity of various surfacings to resist these stresses, information was gathered from practitioners experienced with the range of surfacings available to Australian practice and further developed using data from a laboratory testing program. A draft framework guideline for the selection of the most appropriate pavement surfacings to be adopted for a range of geometric conditions and heavy vehicle loadings was developed through a review of current Austroads publications and discussion with practitioners. (a) For the covering entry of this conference, please see ITRD abstract no. 0612AR242E.
Abstract