Method for bonding prepared substrates for roadways using a low-tracking asphalt emulsion coating

CAFC
  • US 7,918,624 B2
  • Filed: 03/12/2009
  • Issued: 04/05/2011
  • Est. Priority Date: 11/18/2005
  • Status: Active Grant
First Claim
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1. A method for bonding a layer of asphalt pavement material to a substrate layer, the method comprising:

  • providing an emulsion comprising at least a first phase which includes an asphalt composition, a second phase comprising water, and emulsifying and stabilizing additives, the asphalt composition in the emulsion effective for providing a coating having a penetration value less than about 40 dmm and a softening point greater than about 140 °

    F. (60 °

    C.) when applied to the substrate layer and cured;

    applying the emulsion to an exposed surface of the substrate layer in an amount which is sufficient to provide a coating on the exposed surface of the substrate layer, the coating and emulsion including an amount of the asphalt composition effective to bond the asphalt pavement layer to the substrate layer;

    providing heated asphalt pavement material to provide the asphalt pavement layer, the asphalt pavement material heated to a temperature sufficient to soften the coating on the substrate layer to form a bonding surface on an exposed surface of the coating;

    applying the heated asphalt pavement material to the exposed coating surface to form the asphalt pavement layer and to soften the exposed coating surface forming a bond between the asphalt pavement layer and the substrate layer.

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