Tensar TriAx (TX) Geogrids
Conventional construction practices are presenting new challenges to pavement engineers, contractors and owners due to the volatility of material costs and their availability. Construction budgets are under constant scrutiny to deliver the highest quality end product for the least amount of money. Indeed, the practice of implementing a “typical pavement section” is costing many owners both time and money due to a number of factors:
- Asphalt and crushed aggregate pricing volatility
- Reduced construction and maintenance budgets
- Pavement life span being compromised due to increased trafficking or insufficient pavement structure
These factors have decision makers questioning performance estimates and the conventional strategies they once relied upon to evaluate projects and set priorities.
A growing number of transportation professionals are considering designs that incorporate Tensar TriAx® Geogrid.
TriAx, the ground breaking triangular stabilization geogrid, is one of the industry’s leading solutions for creating mechanically stabilized pavement structures.
A BREAKTHROUGH TECHNOLOGY
In combination with Tensar’s engineering and design services, cost-analysis tools and site assistance, TriAx Geogrid provides a simple, reliable and affordable solution for constructing flexible pavements that deliver both reduced construction cost and long-term value.
TriAx offers a proven performance benefit for paved roads by:
- Reducing pavement component thickness – asphalt, aggregate base and granular subbase
- Simplifying construction
- Lowering long-term maintenance costs
TriAx Geogrid enables you to create durable and cost efficient engineered structures through the product’s unique structure and performance properties.
Better Interlock and ConfinementThe triangular geometry provides a significantly different structure than other commercially available geogrids, delivering high radial stiffness throughout the full 360 degrees.
Triangular Aperture GeometryFull-scale research has proven that geogrids manufactured with deeper ribs and square edges outperform geogrids with rounded edges and thinner ribs
Junction Integrity and EfficiencyTriAx Geogrids’ unique aperture geometry forms a
hexagonal junction shape with superior junction
strength and stiffness to mitigate radial stress
imparted from a trafficked surface.
Superior Performance for Paved and Unpaved RoadsTriAx Geogrid’s near isotropic stiffness characteristics contribute to its improved performance in comparison to BX Geogrids in trafficked applications.
Enhanced "Snowshoe Effect"The greater rib depth and radial stiffness characteristics of TriAx Geogrid are more effective in confining overlying granular fill than the traditional BX Geogrids.
Less Stress on SubgradesTriAx Geogrid creates an enhanced, mechanically stabilized composite material for constructing over soft soils. The triangular aperture geometry more effectively dissipates the radial stress imparted by in-service loads.
Tensar FilterGrid (FG) Geogrids
When stabilizing paved or unpaved structures it is important to not only consider the appropriate geogrid product and thickness of granular fill, but also whether adequate filtration and separation of dissimilar materials will be maintained throughout the life of the structure. While Tensar TriAx geogrid frequently provides adequate confinement of the fill to achieve both filtration and separation, there are times when specifiers recommend a geotextile in conjunction with the geogrid. Tensar TriAx FilterGrid provides the superior performance to Tensar’s patented TriAx technology along with the added assurance of a non-woven geotextile – all in a single composite product.
HOW FILTERGRID WORKS
TriAx FilterGrid stabilizes working surfaces, such as paved and unpaved roadways, airfields, crane pads and other working surfaces by providing confinement, separation and filtration. FilterGrid combines the stabilization benefits of TriAx with the separation and filtration benefits of a non-woven fabric.
TriAx’s unique structure provides a high degree of in-plane stiffness through a mechanism known as lateral restraint. Lateral restraint is the ability to confine and stabilize aggregate particles within the plane of the geogrid. As granular base courses are stress-dependent materials, the confinement offered by properly designed, stiff geogrids improves the modulus of an aggregate material, improves load distribution, and maintains that modulus over a much longer period of time than an unstabilized aggregate. This confinement improves speed of construction, reduces fill requirements, and enhances the performance and durability of these working structures over time.
The non-woven filter fabric attached at the nodes of the TriAx provides separation and filtration. Fine grained subgrades, especially those consisting of low plasticity silts and clays, present separation and possibly filtration needs. Tensar’s SpectraPave design software provides tools to assess if a non-woven separator is needed. This tool is based on guidance outlined in many resource documents including those of Cadergren, Terzaghi, Peck and Mesri where piping and uniformity ratios are set based on the soil type.
Multi-FunctionalProvides aggregate stabilization, filtration, and separation.
EconomicalOptimizes the structural thickness to save time and money
Eco-FriendlyPermanent, safe alternative to the use of chemical stabilization agents.
Simple and EfficientRather than installing a geotextile and TriAx in two separate steps, FilterGrid deploys as a single layer – saving time and labor costs.
Tensar BX Geogrids
Tensar International invented and advanced the biaxial form of geogrid – the original geogrid. Tensar® BX Geogrids have been used for mechanical ground stabilization in over half a million projects worldwide, including roads, reinforced foundations and working platforms.
Unlike geotextiles, Tensar® Biaxial (BX) Geogrids provide a highly effective means for reducing pressure below the trafficked surface. BX Geogrid stiffness and open apertures create a “snowshoe effect” that evenly and broadly distributes load while inhibiting particle movement at the interface between interlocked fill and subgrade. Contrast this with the less efficient “hammock effect” and frictional resistance provided by fabrics.
Tensar BX Geogrids are created using precise blends of polypropylene, copolymers and additives to resist high, short-term dynamic loads or moderate loads over longer time periods. While these products have been successfully used in a variety of applications for over 30 years, most designers working with geosynthetics today have turned to the more advanced and cost-effective technology of Tensar®TriAx® Geogrid.