In one region, scrap tires are burned as fuel. In another, they’re recycled into products like rubber playground mats. Somewhere else, tires are a commodity—valuable in any number of civil engineering uses. For the Ragged Lake Transit Access Connector Roadway in Nova Scotia, Canada, tires were an opportunity. So, what’s in a road?
What People Are Saying
“Provinces across Canada can really benefit from the use of TDA.”Bernie Mills, Discipline Leader, Geotechnical Engineering
Thanks to a nearby tire-derived aggregate (TDA) recycler, the Halifax Regional Municipality (HRM) and the Nova Scotia Department of Transportation and Infrastructure Renewal (NSTIR) were already interested in the possibilities of using TDA for a roadway embankment application.
Our job was to design and manage the TDA inclusion in the roadway embankment. A lot of people picture asphalt being laid directly over shredded tires, but that’s not the case. In reality, the TDA light-weight fill layer was positioned within the embankment several metres below the top of the asphalt layer.
The three-metre (9.8-foot) thick layer of TDA is wrapped in geotextile then followed by engineered fill. After that was gravel, and then—finally—the asphalt.
In 2010, the Halifax Regional Municipality opened the Ragged Lake Transit Centre. The new facility complemented the existing Metro Transit Facility and added an additional 150 buses to their fleet.
Relieving strain on the Burnside Industrial Park bus facility in Dartmouth, the Ragged Lake Centre also greatly reduced operating costs by allowing buses to be dispatched from both sides of Halifax Harbour instead of only from Burnside.
With our inclusion of the light-weight tire-derived aggregate (TDA) fill, the Government of Nova Scotia recycled nine months worth of discarded tires, and saved money on engineered fill.
With this additional tool in their repertoire, the Government of Nova Scotia now has additional options for civil projects and a better alternative to trucking scrap tires out of the province for disposal.
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