Multi-criterion examination of expanded asphalt stabilization as a possible pavement rehabilitation alternative

A recent demonstration project carried out by the Ministry of Transportation Ontario, provided an excellent opportunity to evaluate performance of expanded asphalt stabilization and particularly performance in the Canadian climate. The demonstration project was designed to evaluate the structural properties, material aspects, performance, and environmental factors related to the design and construction of expanded asphalt stabilization. One notable advantage of this technique was the re-use of existing aggregate resources, as there was a limited availability of aggregates in the area. Extensive testing was carried out to determine the properties of the expanded asphalt mix, including gradation, per cent asphalt cement, dry tensile strength, wet tensile strength and tensile strength ratio. Compaction and thickness were verified in the field. The variability associated with each of these properties is described and typical distributions have been constructed. The variability associated with each section is described and an Analysis of Variance was carried out on each of the sections to determine statistical differences. Roughness and rut depths were measured and the statistical analysis is presented.