Reflective Crack Control for Flexible Pavements

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Reflective Crack Control for Flexible Pavements

 

rg_costinfoAloneReflective cracking of flexible and composite pavements is typically caused by traffic loading, age hardening or temperature cycling. A general “rule of thumb” suggests that an existing crack will typically propagate through an asphalt overlay at a rate of 1 inch per year. Once the crack reaches the surface and moisture penetrates, rapid deterioration of the underlying layers will ensue unless rehabilitative action is taken in a timely manner.

Introduction of a geogrid interlayer within an asphalt overlay significantly increases the length of time it takes for an existing crack (in the underlying asphalt) to reach the surface. Consisting of high tenacity, coated, fiberglass yarns, AllianceGeo’s RG Geogrid products help create a composite material combining the compressive strength of the asphalt mix with the tensile strength of the geogrid. In this way, cracks propagating towards the surface are intercepted and redirected horizontally. The cracks eventually start to migrate vertically again but reach the surface following an extended period of time.

Scope

  • Thermal cracking
  • Block cracking
  • Joint cracking in composite pavements
  • Lane widening cracking

Benefits

  • Increase asphalt overlay life by 2 to 3 times
  • Reduce required overlay thickness
  • Increase periods between maintenance events and traffic shut-downs
  • Geogrid product is easily ground up in future milling and asphalt recycling operations