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The second P3 project for the Northwest Anthony Henday Ring Road in Edmonton stretches from Yellowhead Trail east to Manning Drive. Con-Force Concrete Products was contracted to build 220 Concrete NU Bridge
Girders, with the largest being 2.75 m in height and 55 m long. Included on the 21 km roadway project are eight interchanges, five fly overs, and two rail crossings — for a total of 29 bridge structures.
With single tire load ratings over 90,000 lbs and a subgrade CBR of 1%, the existing Con-Force gravel yard was not suited to handle the large stresses of their new Mobile Gantry Cranes once loaded with these large girders.
Con-Force’s geotechnical engineer suggested the use of woven geotextile, biaxial geogrid and 1.2 m of select granular fill. With the high cost for granular materials, the owner approached Nilex to explore a more economical solution.
Nilex, along with partner Tensar International, suggested the use of TriAx™ geogrid, a revolutionary geogrid product introduced into the North American market in April 2009. Its triangular apertures provide multi-directional properties, 360° reinforcement, and a new level of in-plane radial stiffness. With the improved junction, there is 100% transfer of load, resulting in no loss of efficiency.
Nonwoven geotextile was placed directly on the soft subgrade, followed by 150 mm of crushed gravel. A layer of TriAx Geogrid was installed, followed by 300 mm of crushed gravel. The contractor was concerned they would not achieve compaction requirements with such a small lift of granular material. Third party density test confirmed these requirements were met before proceeding to the second lift. A second layer of TriAx Geogrid was added, followed by the remaining 350 mm of crushed gravel.
With TriAx Geogrid incorporated into the project, the owner saw an overall savings of $10,000 due to a reduction in granular material. Con-Force received a stamped engineered design from Tensar and assurance that the Gantry Cranes can move their large cargo safely and confidently through the new yard.
Nilex is committed to unearthing better results. Whether it’s for a civil, resource or environmental project, we offer the latest engineered and technically superior materials and techniques to save our customers time and money, and minimize the need to move or remove earth, and reduce the need for granular materials.
With over 35 years experience, a long-standing commitment to the environment and highly qualified staff, Nilex delivers the products and technologies that give clients an economic advantage with environmental benefit.
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