Resurfacing of Highway 127 in Ontario Using a High Performance Double Chip Seal

摘要

Highway 127 is a two-lane roadway between Maynooth and Highway 60 in Eastern Ontario. The highway carries 1600 Average Annual Daily Traffic (AADT) with 8.5 percent commercial vehicles. Prior to 2006, the pavement surface consisted of moderate to severely oxidized hot-mix asphalt, with non-uniform, heterogeneous sections.The Ministry of Transportation, Ontario (MTO) Eastern Region selected a double chip seal treatment for a 16.4 km section of this road as a way to improve surface characteristics but also as a holding strategy before having to proceed with full road rehabilitation. The contract called for a formal project-level design including aggregate-binder compatibility testing and surface treatment performance testing. The seal incorporated a CRS-2P emulsion with Ontario Provincial Standard Specification (OPSS) 304 Class 1 aggregate for the first lift and a 1/4-1/8" chip for the second lift. The project was completed by Miller Paving during August 2006.The paper summarizes the stages of this project. It specifically outlines the laboratory work and presents several design methods incorporated, with emphasis on how project parameters led to adjustments in binder application rates. Finally, the paper summarizes the construction stage with emphasis on equipment calibration, materials application and process control, traffic control and logistical aspects.