This paper was also published at the thirty seventh annual conference of Canadian Technical Asphalt Association, held November 1992, Victoria, British Columbia 1992, p. 184-199, For the abstract see IRRD 807992 (ses critical that all asphalt pavement construction and maintenance activities systematically involve cost-effective, technically advanced materials and practices to preserve the ever-challenged pavement investment. A key step in keeping the Metro Toronto pavement infrastructure `healthy' is a user-friendly pavement management system (PMS) used to identify and prioritize rehabilitation and reconstruction requirements. Regular review of pavement condition has resulted in advances in materials (high stability hot-mix asphals for rutting resistance), construction practices (unshrinkable fill for utility cuts), recylcing (crushed concrete for granular material), and specifications. It is very important to have a comprehensive hot-mix asphalt specification that is clearly understood, through participation by agency, consultant and contractors alike, to ensure `smooth' projects and pavements. An integrated approach to pavement rehabilitation from subgrade drainage considerations right through to required surface source functional properties is required. In addition to current practices, apparent problems such as the poor fatigue resistance and durability of rather harsh high stability mixes are discussed along with future materials selection such as micro-surfacing and stone mastic asphalt.
Samenvatting