EVALUATION OF GAP-GRADED ASPHALT CONCRETE MIXTURES

THIS REPORT PRESENTS THE RESULTS OF A COMPARATIVE LABORATORY STUDY BETWEEN WELL- AND GAP-GRADED AGGREGATES USED IN ASPHALT CONCRETE PAVING MIXTURES. A TOTAL OF 424 BATCHES OF ASPHALT CONCRETE MIXTURES AND 3,960 MARSHALL AND HVEEM SPECIMENS WERE EXAMINED. THERE IS STRONG EVIDENCE FROM THIS INVESTIGATION THAT, WITH PROPER COMBINATIONS OF AGGREGATES AND ASPHALTS, BOTH CONTINUOUS- AND GAP-GRADED AGGREGATES CAN PRODUCE MIXTURES OF HIGH DENSITY AND OF QUALITIES MEETING CURRENT DESIGN CRITERIA. THERE IS ALSO REASON TO BELIEVE THAT THE UNQUALIFIED ACCEPTANCE OF SOME SUPPOSEDLY DESIRABLE, CONSTANT, MATHEMATICAL RELATIONSHIP BETWEEN ADJACENT PARTICLE SIZES IS NOT JUSTIFIED. IT IS RECOMMENDED THAT THE AGGREGATE GRADING LIMITS BE RELAXED OR ELIMINATED AND THAT THE ACCEPTANCE OR REJECTION OF AN AGGREGATE FOR USE IN ASPHALT PAVEMENT BE BASED ON INDIVIDUAL MIXTURE EVALUATION. THE THREE VOLUMES CONTAIN THE PHYSICAL AND MECHANICAL PROPERTIES, STATISTICAL DESIGN AND ANALYSIS OF MEASUREMENTS, AND AN APPENDIX SHOWING PROCEDURES AND BITUMINOUS MIX DESIGN DATA.

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Filing Info

  • Accession Number: 00206121
  • Record Type: Publication
  • Report/Paper Numbers: 3 Vols
  • Files: TRIS
  • Created Date: Apr 20 1974 12:00AM