UPGRADING OF MARGINAL AGGREGATES FOR IMPROVED WATER RESISTANCE OF ASPHALT CONCRETE

Work done at Pennsylvania State University on the upgrading of marginal aggregates in asphalt concrete mixtures in order to improve the water resistance of the mixtures is reported. A number of alternate approaches or treatment classes that show promise for improving the water resistance of asphalt concrete mixtures were identified. Typical treatments from each class were used with six marginal aggregates that have performed unacceptably in the field. The water resistance treated and untreated mixtures was studied by using a freeze-soak conditioning procedure and resilient modulus, E-modulus, and tensile-strength test procedures. Test procedure variability, effect of treatment on mixture properties, and effectiveness of the treatments in improving water resistance are discussed. It is concluded that a variety of approaches should be considered for improving the water resistance of asphalt concrete mixtures. These include the use of conventional antistripping additives, surfactants, hydrated lime, aggregate pretreatment, aggregate coatings, and modified binders. It was found that the effectiveness of the treatments varied with the different aggregates and that the treatments must be selected according to the mechanism responsible for moisture damage. The treatments affected the mechanical properties (stiffness and strength) of the mixtures to varying degrees. (Authors)

Media Info

  • Media Type: Print
  • Features: Figures; References; Tables;
  • Pagination: pp 46-52
  • Monograph Title: Corrosion, Cathodic Protection, Aggregate Upgrading, Concrete Density, and Pavement Markings
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00331046
  • Record Type: Publication
  • ISBN: 0309031044
  • Files: TRIS, TRB
  • Created Date: Jun 12 1981 12:00AM