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Structural Improvement- Paved

Introducing structural improvement to new paved roads or parking areas by mechanical stabilisation of the unbound layers can have several advantages. Using the Tensar Spectra Pavement Optimsation System. The trafficking performance of a road can be increased as well as providing opportunities to reduce the thickness of unbound capping, sub-base and asphalt layers. Increasing traffic capacity can have a positive effect on whole life costs such as maintenance and rehabilitation. 

Short term benefits in terms of reduced layer thickness can be utilized as well as reduced excavation and volume of spoil produced enabling big savings in project costs, time and carbon emissions. In the longer term its structural contribution can help mitigate fatigue cracking and degradation, prolonging the life of the pavement. 

How geogrids can help

Tensar TriAx® geogrids work by mechanically stabilising the unbound granular fill used in the lower layers of the pavement construction. Thanks to its unique design, the fill aggregate particles interlock with the geogrid’s triangular apertures to create a mechanically stabilised layer or MSL. TriAx® geogrids mechanically interlock and confine granular fill particles, which creates an efficient stiff composite layer with outstanding performance under traffic loading, yet requiring less aggregate than conventional construction. The construction phase of any road is critical. The stabilising effect of a Tensar TriAx geogrid in the unbound road foundation layer will protect formation soils limiting any ruts which form during construction and could remain for the life of the road. The increased modulus of the resulting Tensar MSL then allows Engineers to benefit from increased roadway life whilst assessing any construction thickness reduction.

Improving performance and reducing costs

Using the Tensar Spectra Pavement Optimisation system, the trafficking performance of a road can be increased as well as providing opportunities to reduce the thickness of unbound capping, sub-base and asphalt layers.

The benefits

Introducing TriAx® geogrids in a road construction can have significant benefits compared with a non-stabilised solution:

Reduced layer thickness: the unbound granular layers can be reduced by up to 50% with no performance loss. This may also mean that less soft subgrade soil needs to be excavated and disposed of.

Longer life: with an improved layer modulus, control of subgrade rutting and mitigation of differential settlement, the life span of the whole pavement can be increased


Long term cost savings: less excavation and use of natural aggregates can reduce construction costs and halve construction CO2 emissions, while less disruption and improved design life offer longer-term savings

Mitigation of differential settlement: over very variable ground or when road widening, unbound layer stabilisation using Tensar TriAx® can help control differential settlement

Whatever your project, we can help

Tensar’s innovative technology has been used in projects worldwide, and a full range of case studies and brochures is available. Tensar has developed powerful TensarPave™ software to enable designers to arrive the optimum solution for specific project conditions. We also offer full technical support including expert advice, specifications, drawings, certified designs and details of pricing, and we regularly run free workshops across the globe. 

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