When reflective cracks migrate to the surface, the long-term integrity of flexible and composite pavements can quickly become compromised. The conventional method of dealing with this type of distress is to mill the top few inches and overlay the remaining pavement with “fresh” asphalt. When a RoadGrid product is included within the overlay, the amount of time it takes reflective cracks to re-appear is typically extended by two or three times. The inclusion of RoadGrid can significantly reduce the long-term maintenance costs for pavement owners.
What is a Pacific GeoSource RoadGrid?
RoadGrid is used to help mitigate reﬂective cracking in ﬂexible and composite pavements. RoadGrid provides the benefit of extremely stiff, ﬁber-glass strands that are coated with bitumen and is knitted together to form a grid structure.
How do Pacific GeoSource RoadGrids work?
When an overlay is placed over already cracked pavement, the overlay will eventually reflect those same cracks. RoadGrid eﬀectively combines two components to form a composite material, 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 as long) and increasing the period between major rehabilitation events.
Delay appearance of reflective cracks in overlays due to:
- Badly cracked underlying pavement structure
- Concrete joints
- Transverse cracking
- Road widening
- Trenching activities