RoadGrid

Pacific GeoSource has a full range of GeoGrid products to provide performance and cost benefits for any road structure, pavement or retaining wall/steep slope. Our RockGrids for example are used to reinforce the unbound aggregate layers that form the sub-base and/or base course layers in road structures. By including a RockGrid within one or both of these layers the engineer can extend the life of the road or reduce the layer thickness leading to substantial initial cost savings.

These products have been used extensively worldwide for 30+ years and have gained formal recognition in the US from the likes of The US Army Corps of Engineers, The American Railway Engineering and Maintenance-of-way Association and more than 40 State Departments of Transportation. Our RockGrids are available in roll widths of 2.95m, 3.95m, 4.95m and 5.95m (9.7 ft, 13.0 ft, 16.2 ft and 19.5 ft.). It should be noted that Pacific GeoSource is the only company in the US able to supply 19.5 ft wide rolls. We are therefore in a unique position to help the contractor and owner reduce wastage costs to an absolute minimum!

When reflective cracks migrate to the surface, the long-term integrity of flexible and composite pavements can be quickly compromised. Conventional practice in dealing with this type of distress is to mill the top few inches and overlay the remaining pavement with “fresh” asphalt. When a geogrid interlayer product is included within the overlay, the time for reflective cracks to appear again is typically extended two to three fold. Inclusion of geogrid interlayers can therefore significantly reduce the long-term maintenance costs for pavement owners. A variety of Pacific GeoSource RockGrids are available to help mitigate different crack types and degrees of severity.

RoadGrid

What is an Pacific GeoSource RoadGrid?

Pacific GeoSource RoadGrids are used to help retard reflective cracking in flexible and composite pavements. These products derive their reinforcement benefits from extremely stiff, fiber-glass strands which are coated with a polymer and then knitted together to form a grid structure. Adhesive material on the underside of the RoadGrid helps expedite installation and ensures a firm bond between the asphalt layers above and below.

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How do Pacific GeoSource RoadGrids work?

When an overlay is placed over an existing cracked pavement, the cracks will eventually be reflected at the surface. The Pacific GeoSource System effectively allows two components to form a composite material i.e. the tensile strength of the RoadGrid combines with the compressive strength of the asphalt. Cracks propagating upward are intercepted by the RoadGrid and prevented from immediately migrating further thus extending the life of the overlay (2 to 3 times) and increasing the period between major rehabilitation events.

 

Applications:

  • Conventional asphalts pavements
  • Composite pavements

Delay appearance of reflective cracks in overlays due to:

  • Badly cracked underlying pavement structure
  • Concrete joints
  • Transverse cracking
  • Road widening
  • Trenching activites
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