Improving Paved Roadway and Parking Structures
Conventional road construction practices present ever-growing challenges to pavement engineers, contractors and owners. Road construction budgets are under increasing pressure to deliver improved performance for less money. The practice of installing a “typical pavement section” is proving to be problematic, costing owners additional time and money due to increasing road traffic loads, inadequate pavement structures, lower maintenance budgets and increasing material costs.
These issues have forced authorities to seek alternatives to the conventional strategies they once relied on to evaluate their projects and set priorities. A growing number of transportation professionals are adopting Tensar International’s Spectra® Roadway Improvement System, incorporating Tensar® TriAx® Geogrid, to optimize pavement design and construction.
The Spectra System combines Tensar TriAx Geogrid with aggregate fill to create a mechanically stabilized layer (MSL) that is significantly stiffer and more robust than a conventional unbound aggregate layer. The enhanced structural characteristics of the MSL allow the designer to obtain greater performance from the total pavement structure, which results in more economical construction, more consistent surfaces, improved performance and longer life.
Pavements designed with the Spectra System offer:
• Reduced construction costs of 15% or more due to the optimization of pavement layer configuration
• Dramatic extensions of pavement life due to enhanced performance of the MSL
• Reductions in aggregate and asphalt quantities
• Reduction in construction times
• Optimized life cycle costs and maximum total value
It’s estimated that half of all roads in the United States, and an even higher percentage of roads throughout the world, are unpaved. Many serve as heavy-duty access and haul roads for applications ranging from mining and logging operations to wind farms and landfills.
Weak subgrades pose the greatest challenge to these roads. A weak subgrade subjected to continuous heavy traffic can quickly deform, causing the road surface to rut, pothole, “washboard” and ultimately deteriorate beyond use.
With increasing aggregate prices, tighter construction budgets and heavier wheel loads, lower cost alternatives to traditional methods of unpaved road construction have become more important. One cost-effective, proven alternative has successfully stabilized thousands of miles of unpaved roads around the world: Tensar® TriAx® Geogrids.
Tensar TriAx Geogrids are designed to reduce stresses applied to weak subgrades. Geogrid and aggregate interlock to create a mechanically stabilized layer (MSL) that distributes loads evenly to increase bearing capacity and to ensure long-term performance. In addition, TriAx Geogrids provide effective separation and filtration properties when properly graded aggregate fill is used in the MSL.
Tensar TriAx Geogrids improve the performance of unpaved roads by:
- Maintaining road surface quality
- Reducing the frequency of surface maintenance
- Reducing aggregate requirements up to 60%
- Accelerating construction
- Reducing labor and equipment needs
- Eliminating the need for costly overexcavation and disposal of poor quality soil
- Eliminating challenges associated with chemical stabilization
- Minimizing disturbance to the terrain and surrounding area