Ontario's Move to Hot Mix Asphalt Pavement Smoothness Acceptance Using High Speed Inertial Profilers

The Ministry of Transportation Ontario (MTO) implemented a smoothness specification for newly constructed hot mix asphalt paving in 1997. Up until 2010, the smoothness of new asphaltic pavements was accepted based on Profile Index (PI), measured by California profilographs. These 7.6 m long manual profilographs are operated at walking speed, measure one wheel path at a time and require lane closures. Therefore, MTO and the Ontario hot mix asphalt industry sought an alternative device that would be faster and safer to operate, alleviating the need for lane closures. MTO adopted the ProVAL software program to calculate International Roughness Index (IRI) and identify localized roughness. This paper presents the transition from the TxDOT algorithm in ProVAL to the Smoothness Assurance Module (SAM) of ProVAL version 3 to identify localized roughness. In the 2010 and 2011 construction seasons, MTO conducted extensive analyses in collaboration with the Ontario hot mix asphalt industry to develop comparable acceptance thresholds between the two algorithms. From these analyses, a two-category payment reduction system was developed, to replace the former three-category system, for localized roughness. This paper reports on studies supporting the transition from California profilographs to high speed inertial profilers, and the analysis that led to development of acceptance criteria for localized roughness based on the ProVAL Smoothness Assurance Module. The paper also provides an overview of the challenges that were faced during implementation of high speed profilers and how they were overcome. For the covering abstract of this conference see ITRD record number 201310RT334E.


  • English

Media Info

  • Pagination: 12 p.
  • Monograph Title: 2013 Conference and Exhibition of the Transportation Association of Canada - Transportation: Better - Faster - Safer

Subject/Index Terms

Filing Info

  • Accession Number: 01518030
  • Record Type: Publication
  • Source Agency: Transportation Association of Canada (TAC)
  • Files: ITRD, TAC
  • Created Date: Mar 11 2014 10:59AM