Modified asphalt

  • US 6,444,731 B1
  • Filed: 05/24/2000
  • Issued: 09/03/2002
  • Est. Priority Date: 08/06/1999
  • Status: Expired due to Term
First Claim
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1. A method for making a modified asphalt, comprising the steps of:

  • (a) adding a dispersion agent comprising at least one of furfural and vegetable oil to modifier material comprising at least one of a granular crumb rubber and polymer having an unsaturation to form a treated modifier material;

    (b) mixing the treated modifier material at a temperature of between 90°

    C. and 1500°

    C.;

    (c) adding the treated modifier material to hot asphalt;

    (d) mixing the combination of treated modifier material and hot asphalt; and

    , (e) adding a first acidic activator material to the mixture of treated modifier material and hot asphalt to produce a devulcanized and stabilized asphalt material having improved theological, separation and solubility characteristics.

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