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The site owner was looking for a cost-effective reinforcement for a soft subgrade under the driving and working areas of a 32-acre (13 ha) industrial park that has been divided for multiple tenants. Reduced gravel thickness would lower costs, but on its own, would also reduce strength.
Dawson Creek, BC
Owner: 780 Highway 2 Properties, Ltd.
Contractor: Brocor Construction Ltd.
Completion Date: October 2017
The size of the lot proved the single biggest challenge for cost and environmental impact, in relation to gravel hauls to site. With only a nonwoven geotextile on the soft subgrade, up to 450 mm (17 3/4”) of gravel would have been required to stabilize the soil to allow for heavy, year-round use by large trucks. Since every gravel haul is costly, the client was anxious to keep these to a minimum. This approach also reduces impact on the environment through vehicle emissions and the relocation of local materials.
To help reduce gravel thickness, Nilex performed an analysis of two options, both of which incorporated a 6-ounce nonwoven geotextile. The first option included a biaxial geogrid; the second used TX-130 Triaxial Geogrid. The TriAx Geogrid option offered performance enhancements and the thinnest cross-section of gravel (down from the original 450 mm to just 254 mm). TriAx is an effective solution for interlocking aggregate structure, which provides strength and thus reduces the overall amount of aggregate required. The combination of TriAx Geogrid with a nonwoven geotextile to separate the subgrade from the aggregate, allowed better interlock in that layer.
The size of the industrial park is one reason the owner chose to complete the lot in phases. Only 15 of the 32 total acres will be completed in 2017; the rest of the lot will follow in 2018, using the same materials and methods. Three workers were involved: One to drive the gravel spreader and two to roll-out and flatten the material before the loads were placed. Nilex provided design analysis, orientation for product installation and ongoing site support.
The choice of TX-130 allowed the owner to maintain a thinner cross-section of gravel while also enhancing the number of axle passes the lot can support. Using Nilex's ECO2 Calculator to factor in the cost of gravel and the distance it’s hauled to site, the use of TX-130 saved the client over $1.6 million in gravel and related costs.
The ECO2 Calculator also showed that the choice of materials and methods reduced the project’s vehicle emissions environmental impact by 402 tonne-equivalents of CO2.
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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