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Breadcrubs

Nilex shows that they stand behind, and on top of, their products by putting TriAx in their own yard and under their new headoffice!

Nilex Inc. was building a new headoffice for its expanding business and chose the perfect spot for its new 20,000 sq. ft. office, fabrication shop and yard on a 7.5 acre site just off of the new South East leg of the Anthony Henday highway. Although the location was highly desirable, the soil conditions were not! Seeing as this site would ship and receive thousands of truckloads per year, as well as undergo constant and multidirectional forklift traffic, something needed to be done to improve the subgrade.

Location

Edmonton, AB

Product

  • TriAx® Geogrids

Project Partners

  • Owner: Nilex Inc.
  • Consultant: Stantec & Tensar Earth Technologies
  • Contractor: Cormode & Dickson and Twin City
  • Completion Date: October 2013

CHALLENGE

The site consisted of two lots which had concrete grade beams and piles that were abandoned by previous owners. Further geotechnical investigation revealed organics, marginal fills and a silty, high plastic clay, which made it unsuitable to build the new facility. The removal of approximately 2.4m of unsuitable soil, and/or the inclusion of cement powder to improve the subgrade conditions would have been cost prohibitive. Disking and drying of the soils would have been beneficial, but as the impending Alberta winter was just around the corner there was no time for this option.

SOLUTION

As suppliers of geosynthetics for over 38 years and with a long list of successful yard improvement projects under our belt, the decision was made to incorporate geotextiles and geogrids into the design.
The structure consisted of two layers of TriAx Geogrid utilizing in-situ soils without the need to import any more expensive engineered fills.

INSTALLATION

The site was cut to the proposed subgrade elevation. The clay subgrade was unsuitable and extensive rutting occurred. Another 300mm of clay was windrowed to one side of the site, a TX160 Geogrid was installed and the 300mm of clay was replaced and compacted. This layer of reinforced clay material provided a suitable subgrade to build a reinforced granular base. A light-weight nonwoven geotextile was placed on the clay subgrade to provide separation and filtration from the fine silt particles in the clay. The TX140 Geogrid was placed on the geotextile followed by 300mm of compacted granular base course. A heavy-duty lift of 100mm to 150mm of asphalt was placed on all heavily loaded areas of the new shipping yard.

RESULTS

By incorporating the first layer of TX160 Geogrid, we improved the bearing capacity of the unsuitable clay soils without the need to perform the standard “remove and replace” scenario. The second layer of TX140 Geogrid significantly improved the granular layer strength coefficient, increasing the service life and reducing maintenance costs.
Utilizing TriAx Geogrids reduced the amount of aggregate needed by 1,770 m3, lowered the project cost by nearly $415,000 and saved 94 tonnes of CO2 from being emitted into the atmosphere.

THE NILEX ADVANTAGE

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.