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How does a geogrid weighing just 250gm/m2 support a 25 tonne delivery truck?

It works by improving the performance of the aggregate layer – by mechanical stabilisation

Wheel loads generate stress radiating outward from the contact point. The triangular apertures and hexagonal structure of TriAx is designed to resist those radial stresses.

A mechanically stabilised aggregate layer incorporating TriAx can make major cost savings.

See how it works in this video below:

In 2003, the U.S. Army Corps of Engineers (Corps) identified and defined the primary applications for geogrid reinforcement for paved and unpaved structures: mechanical subgrade stabilization and base reinforcement. In an engineering technical letter (ETL), the Corps referenced three primary mechanisms as being relevant to the interaction of geogrid reinforcement and pavement materials: lateral restraint, improved bearing capacity, and tensioned membrane effect. The videos offered below serve to illustrate two of these three mechanisms through the utilization of Tensar’s TriAx Geogrid.

Tensar TriAx geogrids - Sand Box Demonstration – through the use of soft foam, a weak subgrade condition is created to demonstrate the improved bearing capacity realised using Tensar TriAx geogrid. Note how the participant’s weight is not supported in the unreinforced condition yet is fully distributed by the TriAx product forming a reinforced composite of sand and geogrid.

Tensar TriAx geogrid - Box-of-Rocks Demonstration -when pavement or haul road foundation subgrade support is sufficient, properly designed geogrids offer a unique lateral restraint mechanism that serves to mitigate the vertical and horizontal movement of unbound aggregates in a paved or unpaved application. The box-of-rocks is a simple demonstration that shows the confining benefits of TriAx geogrid using aggregate sub-base fill material in a hinged box.


Tensar TriAx geogrids - Tennis Ball Demonstration – proper confinement of aggregate particles is essential to the performance of a well-designed geogrid product. This demonstration uses a snooker-ball type triangular rack and tennis balls to show the significance of incorporating a high-profile rib and a triangular aperture to optimize both confinement of an unbound material and the arrangement of aggregate particles.