Paving Canadian highways looks promising with Compactasphalt®
In 2012, a new type of high-performance paver, Compactasphalt® from Dynapac, completed the first Canadian trial on Highway 12 near Midland, Ontario using latest dual layer paving technologies.
“Any process that does two things at once is bound to be more efficient”, says Erik Thorsrud, General Manager, Atlas Copco Construction Equipment Canada, “but there is more to compact asphalt paving than that, you also get a stronger more durable road.”
Dual layer paving systems, developed in Europe since the early 1990s, now offer hot on hot paving making this new technology the future of the paving industry. A single piece of equipment places two lifts of asphalt in one pass; first the binder course followed almost immediately by the wearing course. Currently, only two manufacturers offer hot on hot pavers, Vögele with its InLine Pave® and Dynapac with its Compactasphalt® paver. For the Midland project, the Atlas Copco/Dynapac system was selected. As explained by Bill Wilcox, Business Line Manager- Heavy Equipment at Atlas Copco Construction Equipment Canada, the paving train consists of five pieces of equipment. At the heart of the process is the Compactasphalt® paver, which is essentially two pavers in one. The bottom paver, which lays the bottom lift, and the module that rides on the bottom paver and applies the top layer of asphalt. (The module can be removed and the paver used for conventional paving as well). A feeder loads the 31-ton hopper on the bottom paver with the binder mix and then shifts position and loads surface mix into the 17-ton hopper on the paver module. The feeder takes just over a second to load a ton of hot mix. The paver places the asphalt with the two hoppers feeding two synchronized screeds. The high compaction screed compacts the binder course, after which the second screed compacts the surface course. A wide low pounds per linear inch static roller compacts the two lifts. After the mixes have been stabilized, standard rollers provide the final compaction. The hot on hot paver is expected to cost about 40 percent more than conventional paving equipment but the combination of increased lifetime and enormous savings on top layer material makes Compactasphalt® a real winner.
Quicker and Better
Dynapac introduced its first Compactasphalt® train in 2004 and while this type of paving is only now making its way to North America, it has been used to pave sections of the German autobahn between Bremen and Hamburg, which features some of the highest volumes of heavy truck traffic anywhere in Europe. A dual layer pavement was tested at the National Center for Asphalt Technology test facility in Alabama over a thirty-month period and despite being subjected to 10 million axle loads, the paved surface showed no signs of deformation.
Later in 2012, Atlas Copco along with a leading Ontario contractor used Compactasphalt® to pave the Peace Bridge Toll Area in Fort Erie, Ontario. The project lasted 14 days and was completed quickly. This was another unique application for Compactasphalt®. The system showed its versatility paving “tapered lanes” starting from 8 lanes to 2 lanes in width in both directions. The Atlas Copco/Dynapac system laid approximately 48,000 tons of asphalt, in 2 lifts over the 14 day period. The Ministry of Transportation in Ontario and the contractor were very pleased with the quality of the paving and the performance of the system.
These new technologies will drive Atlas Copco growth in Road Construction into the future.
For more information, please contact:
- Erik Thorsrud, General Manager, Atlas Copco Construction Equipment, Canada
Tel.: 1 (289) 562-6011 or firstname.lastname@example.org
- Bill Wilcox, Business Line Manager - Heavy Equipment, Atlas Copco Construction Equipment, Canada
Tel.: 1 (705) 431-4053 or email@example.com
Atlas Copco’s Construction Technique business area provides construction and demolition tools, portable compressors, pumps and generators, lighting towers, and compaction and paving equipment. It offers service through a global network. Construction Technique innovates for sustainable productivity in infrastructure, civil works and road construction projects. Principal product development and manufacturing units are located in Belgium, Germany, Sweden, China and Brazil.
Road Construction Equipment is part of the Construction Technique business area. The division is a leader in asphalt, soil and concrete applications, committed to customer performance worldwide. Products and solutions are marketed under the Dynapac and complementary brands. Headquartered in Wardenburg, Germany, the division has production facilities in Europe, USA, South America, and Asia.