TENTATIVE MIX-DESIGN CRITERIA FOR GAP-GRADED BITUMINOUS SURFACES

Since the turn of this century, extensive use has been made of gap-graded bituminous surfacing mixtures in the United Kingdom. The design of these mixtures has largely been empirical, and specifications have been of the recipe type. The excellent performance given by these mixtures, even under the most severe traffic conditions, has prompted engineers in other parts of the world to use these surfaces. Experience has shown that under some climatic conditions the United Kingdom specifications did not always produce the most satisfactory mixtures, and a national method of design was urgently required. This paper covers a research study into factors that affect the performance of gap-graded surfaces and isolates those that are of particular importance. It is shown that the Marshall test method, when used in combination with air permeability and indirect tensile tests, can be used to design gap-graded mixtures. Tentative criteria are established for the mix design of gap-graded bituminous surfaces; they will satisfy normally accepted standards with respect to distortion, fracture strength (toughness), fatigue, imperviousness, and durability.

Media Info

  • Media Type: Print
  • Features: Figures; References; Tables;
  • Pagination: pp 132-145
  • Monograph Title: Characteristics of and factors influencing bituminous materials and mixtures
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00095575
  • Record Type: Publication
  • ISBN: 0309023599
  • Report/Paper Numbers: #517
  • Files: TRIS, TRB
  • Created Date: Jul 2 1975 12:00AM