Construction of longitudinal joints is recognized as one of the most significant asphalt paving construction problems today. At the Swift Airport Conference in Calgary a presentationon longitudinal joints was given by Mr. Rob McClure P. Eng of Hatch, Mott, Macdonald. The presentation outlined the problems of constructing a good longitudinal joint using a case study of a paving project done in 2007 at the DFC Shearwater Heliport in Dartmouth, N.S., Canada. The specifications required cutting and removal of the edge of the cold lane prior to tacking and butting up the new pavement lane. The paving contractor requested and received approval for using an alternate method using a HDE longitudinal joint heater.
The joint heating proved very effective, saving the contractor money in material, labour, and project time. All the test results using the joint heater met the required compaction, whereas the specified technique of cut joints had failures. The appearance of the joint was excellent. The cost was reported to be in the area of $0.15 per lineal meter ($ 0.05 cents per foot), which is considerably under any other longitudinal joint construction technique cost, even considerably under any joint repair technique.The 2008 project specifications were changed to include joint heating.
Heat Design Equipment Inc. has been promoting the idea of a re-heated joint since 1995, and have been supplying equipment to meet a hot joint specifications in the Province of Quebec since it was enacted in 1995. HDE’s joint heaters have been used on numerous projects since then, both in Canada and the United States.
The Shearwater project could be considered the best documented project. Using the joint heater allows the contractor to heat the cold, un-compacted edge to temperatures of +100C (212F) at regular paving speeds in conventional paving temperatures. For faster speeds and colder weather, additional heaters can easily be added so the contractor has the opportunity to re-compact the edge, making a seamless, watertight joint.
One of our previous projects for the Ministry of Transport of Ontario was in 1997 on the Queen Elizabeth Way, where after 11 years “ the longitudinal joints continue to perform well.”
While the idea of a hot joint is not new, echelon paving is recognized as the best way to achieve a good longitudinal joint. However, at HDE we believe that joint heating is the next best thing, providing it can be done efficiently, without overheating the asphalt. Our clients have been successfully using our joint heaters in Quebec, Ontario, Tennessee, Michigan, Nova Scotia and Washington DC (The White House)on actual