RG geogrids 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 geogrid helps expedite installation and ensures a ﬁrm bond between the asphalt layers above and below.
When an overlay is placed over an existing cracked pavement, the cracks will eventually be reﬂected at the surface. The RG geogrid eﬀectively allows two components to form a composite material i.e. the tensile strength of the geogrid combines with the compressive strength of the asphalt. Cracks propagating upward are intercepted by the geogrid 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.
Delay appearance of reflective cracks in overlays due to:
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