Thermal Characteristics of Warm and Hot Mix Asphalt during Construction

One of the critical issues during the construction of a new asphalt road is the temperature distribution along and across the newly laid hot mix, which affects the resulting density and ultimately the performance of the mat. This is of particular importance at longitudinal joints that are most often constructed with a hot layer placed beside an existing colder or older layer. Reduced density at longitudinal joints has been linked with premature failure at these locations, as well as the pavement in general. Thermal imaging offers the opportunity to better assess the quality of newly laid asphalt layers by observing areas of low, high and/or variable temperature during the construction process. This paper presents the details of a pilot study carried out both warm and hot asphalt mixes on Victoria Road in Ottawa, Ontario, Canada, using infrared imaging equipment to analyze the temperature distribution and evolution of the asphalt surface and the joints between mats during construction. While preliminary in nature, the results suggest that rapid heat loss at the edges of newly placed hot mix asphalt lanes likely leads to reduced density and performance of the longitudinal joints, whereas less heat loss was observed with the warm mix. (A)

Language

  • English

Media Info

  • Pagination: p. 441-452

Subject/Index Terms

Filing Info

  • Accession Number: 01149486
  • Record Type: Publication
  • Source Agency: Transportation Association of Canada (TAC)
  • Files: TAC
  • Created Date: Jan 28 2010 7:33AM