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  • One-Step Ground Stabilization and Separation

  • How to Determine When a Geotextile is Needed

  • Beware: Performance Varies Across Similar Products

A marriage made in geosynthetic heaven: TriAx FilterGrid

In some circumstances, fine-grained subgrade soils can't achieve separation from granular layers using geogrid alone. And, using only geotextile for ground stabilization won't achieve the highest performing design. When both functions are required, finding a cost- effective solution becomes necessary.

Now, engineers and contractors can get the best of both worlds with the introduction of TriAx FilterGrid. TriAx FilterGrid merges the superior ground stabilization performance of TriAx Geogrid with the separation/filtration functions of a non-woven geotextile.  

What benefits can you expect?

  • Multi-Functional: Provides aggregate stabilization, filtration, and separation.
  • Simple and Efficient: Rather than installing a geotextile and TriAx in two separate steps, FilterGrid deploys as a single layer – saving time and labor costs.
  • Economical: High-performing TriAx optimizes the structural thickness to save time and money.
  • Eco-Friendly: Permanent, safe alternative to the use of chemical stabilization agents.
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TriAx FilterGrid is a composite material that combines TriAx Geogrid and a non-woven geotextile to achieve ground stabilization, separation and filtration functions in a single installation step.

 

HubSpot Video


Watch our on-demand webinar, " Using Geotextiles with Geogrid." We will review the requirements for achieving separation of fine-grained soils from granular layers, including how to determine when a geotextile is needed and how to select the geotextile. 

 

When to Choose a Geotextile

One of the most important geosynthetic functions, which can be accomplished using both geogrids and geotextiles, is the separation of fine-grained subgrade soils, like silts and clays, from granular layers. With proper design, a well-graded aggregate placed over a stiff, stable geogrid will function as a filter, preventing migration of fine-grained soils. 

However, in some cases, filtration cannot be achieved with geogrid alone due to the combination of the gradation of the subgrade soils and the available granular material. In other cases, the designer does not have sufficient data on the subgrade soils to determine if filtration can be achieved. When faced with these issues, the best solution may be the use of a geotextile to ensure that separation is maintained. 

Because fine-grained subgrades requiring separation are almost always unstable as well, the stabilization function of geogrid is also needed.

Beware: Expect lower performance from similar composite products

There are similar, less expensive products on the market that use different types of geogrid in their designs. However, only FilterGrid incorporates the most tested, proven, reliable, and advanced geogrid technology in the market: TriAx Geogrid. The thick rib height and high aspect ratio of TriAx geogrid allows for improved interlock of aggregate. In combination with the light lamination of the geotextile, this results in better performance compared to other geogrid composites. If aggregate does not fully strike-through the geogrid component (or the geogrid straps are on both sides of the fabric), there is very limited confinement that can take place and thus limits performance.

  • FilterGrid: High Profile Lamination 
    The light duty lamination process eliminates trampoline effect of fabric found with full lamination, allowing better interlock of aggregate through TriAx openings. Thicker rib height and higher aspect ratio allow for improved interlock.

  • Biaxial (BX): Full Lamination
    Full lamination creates a trampoline effect, not allowing aggregate to fully engage with geogrid. Thin ribs don’t engage as well with aggregate.

  • Fabric with Straps
    Aggregate is not constrained the same when fabric barrier exists between transverse and longitudinal ribs. Trampoline effect does not allow aggregate to fully engage with ribs.

 

 

 

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FilterGrid: High Profile Lamination

 

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Biaxial (BX): Full Lamination

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Fabric with Straps

IMG_1751 Filter Grid Interlock Attempt

 

How TriAx FilterGrid Works

TriAx’s unique structure provides a high degree of in-plane stiffness through a mechanism known as lateral restraint. Lateral restraint confines and stabilizes aggregate particles within the plane of the geogrid. The confinement offered by TriAx Geogrid improves speed of construction, reduces fill requirements, and enhances the performance and durability of these working structures over time.

The non-woven filter fabric lightly laminated to TriAx Geogrid 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 Software provides tools to assess if a separator is needed. This tool is based on guidance outlined in many resource documents including those of Cedegren, Terzaghi, Peck and Mesri where piping and uniformity ratios are set based on the soil type.

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About Tensar

Tensar delivers engineered systems that combine technology and design with our products. By utilizing Tensar’s System approach to construction, you can experience the convenience of having a supplier, design services and site support all through one team of qualified sales consultants and engineers. When you partner with Tensar you can expect:

  • Site Assessment: We can partner with any member of your team at the beginning of your project to recommend a Tensar Solution that optimizes your budget, financing and construction scheduling.

  • Design Assistance/Services: Experienced Tensar design engineers, regional sales managers, and distributors will develop budget estimates and proposals to help you evaluate your best construction options and determine the most cost-effective approach.

  • Specification: Our value-engineered solutions feature stamped drawings with precise construction details. Changing site conditions can be quickly addressed in the field or in our Engineering Department.

  • Site Support: Our regional sales managers and our distribution partners can advise your designers, contractors and construction crews to ensure the proper installation of our products and prevent
    unnecessary scheduling delays.

We're proud to offer state-of-the-art design solutions – specialty solutions based on advanced technologies proven since 1982. Tested in the most challenging conditions, these comprehensive solutions save time, resources and money. They’ve become the standard by which others are measured.

 

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