Pavement Rehabilitation: Layers

The quickest, simplest, and cheapest pavement rehabilitation is a thin overlay.  The photograph illustrates two thin overlays peeling off an original surface.

We have some issues with multiple simple overlays, primarily:

  • The overlays flatten the surface and slow storm water drainage
  • The curb heights are reduced
  • Each overlay layer has a shorter performance life than the earlier layer

Our preferred approach is to remove portions of the asphalt concrete layers.  In the example of the top photograph, we would, at a minimum, remove the top two layers and scratch the third layer, patch failures and tack coat the surface prior to applying a HMAC overlay.   

Zimmer Consultants photograph

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