September 3, 2019
As part of a two-year contract, AIL is supplying five large Polymer-Laminated Corrugated Steel Pipe Culverts for the Ministère des Transports Québec (MTQ). One of the largest structures is now being installed at Saint-Roch-de-l’Achigan, under highway ramps for Autoroute 25.
High cover requirement
To satisfy the MTQ’s 8 m cover requirement on this project, the contractor had to have ±6 m of 16 kN/M3 backfill material sandwiched between the required granular fill around the culvert and the road.
The contract comprises five culverts of 50 m or more in length, but in various diameters: two at 3,300 mm, two at 3,000 mm and one at 1,800 mm.
A design service life of over 75 years
MTQ has taken a longer-term view of their infrastructure projects with their decision to go Polymer-Laminated. Polymer Laminate is a tough, heavy-gauge film that is laminated to both sides of galvanized steel to produce a corrosion and abrasion barrier for the most aggressive environments. Polymer- Laminated CSP will stand up to high concentrations of acids and alkalis, with a design service life of over 75 years.
Potential cost savings
Polymer-Laminated CSP can be less expensive across all diameters of concrete pipe. Its exceptional durability provides the potential for reduced lifecycle costs. Plus, CSP can be formed into longer, nestable lengths that are substantially lighter than concrete, making it easier to transport and install.