Publisher's Synopsis
Recent traffic and weather conditions have challenged the ability of some hot rolled asphalts to resist premature deformation, making it necessary to specify hot rolled asphalt in terms of the required performance, and not by recipe alone. This report covers the development of a performance-related specification for hot rolled asphalt wearing courses and summarises the results of road trials carried out to assess its effectiveness. The draft clause, Clause 943, specifies the material in terms of the following properties to ensure the appropriate quality of material is provided: maximum wheel-tracking rate and depth; maximum air voids content; and minimum binder content by volume. The draft clause was examined in extensive trials and it was found that the hot rolled asphalt was laid successfully at each trial site, with results so far showing good compliance with the performance requirements.
