BEHAVIOR OF HOT ASPHALTIC CONCRETE UNDER STEEL-WHEEL ROLLERS

MAXIMUM COMPACTION OF HOT ASPHALT CONCRETE IS OBTAINED UNDER STEEL-WHEEL ROLLERS WHEN THE ROLLER WEIGHT AND NUMBER OF PASSES ARE OPTIMUM FOR THE ROLLER DIAMETER AND LOAD BEARING CAPACITY OF THE MIX. WHEN MORE THAN THE OPTIMUM ROLLER EFFORT IS USED, LOW DENSITIES OR CHECKED SURFACES RESULT. SOME MIXES BEHAVE IN AN ABNORMAL MANNER BY SHOVING EXCESSIVELY UNDER ROLLERS THEY SHOULD TOLERATE. ACCORDING TO ORDINARY DESIGN TESTS, THESE ABNORMAL MIXES MAY BE QUITE STABLE. SOMETIMES THESE MIXES ARE REFERRED TO AS SLOW SETTING. THE PAPER PROPOSES A MECHANISM BY WHICH MIXES CAN BE UNSTABLE AT HIGH TEMPERATURES DURING ROLLING AND STILL BE QUITE STABLE BY NORMAL DESIGN CRITERIA. THE DIFFERENCE IS ATTRIBUTED TO A TRANSIENT HIGH PORE PRESSURE CAUSED BY UNABSORBED ASPHALT. THE CONDITION CAN BE CORRECTED BY CHANGES IN THE MIX DESIGN, FILLER CONTENT, OR AGGREGATE DRYNESS. THE CHARACTER OF THE ASPHALT DOES NOT APPEAR TO BE OF GREAT IMPORTANCE. SEVERAL EXAMPLES OF FIELD PROBLEMS CORRECTED BY APPLICATION OF SOME OF THESE PRINCIPLES ARE GIVEN. /AUTHOR/

Media Info

  • Monograph Title: Asphaltic concrete construction - field and laboratory studies
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00211322
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Aug 28 1994 12:00AM