EXPERIMENTAL OXIDATION STUDIES ON ROAD MAKING BITUMEN

A DESCRIPTION IS GIVEN OF THE PROBLEM WHICH EXISTED IN NEW SOUTH WALES DURING THE LAST 15 TO 20 YEARS IN CONTROLLING THE UNIFORMITY AND QUALITY OF RESIDUAL BITUMEN. AT TIMES PREMATURE HARDENING RESULTED IN POOR QUALITY SURFACING, PARTICULARLY WITH ASPHALTIC CONCRETE. HOWEVER, CONSIDERABLE IMPROVEMENT IN THE QUALITY OF THE LOCAL PRODUCTION HAS OCCURRED OVER THE LAST FEW YEARS FOLLOWING THE INCLUSION OF VISCOSITY AND THIN FILM OVEN TESTS IN THE SPECIFICATION, AND THE REGULAR TESTING OF SAMPLES TAKEN AT THE REFINERY. EXPERIMENTS ON THE EFFECT OF HEATING BITUMEN IN VARIOUS ATMOSPHERES HAVE REVEALED A CLOSE ASSOCIATION BETWEEN OXYGEN REACTIVITY AND THE RATE OF CHANGE IN PROPERTIES, THE BITUMENS OF KNOWN POOR SERVICE VALUE SHOWING THE MOST CHANGE. IT CAN BE INFERRED THAT OXIDATION IS THE PRIME CAUSE OF DETERIORATION, PARTICULARLY IN THE PROCESSING STAGE OF SURFACING. APPARATUS WAS DEVELOPED FOR OXYGEN UPTAKE MEASUREMENTS, AND THE VARIOUS MEANS OF MEASURING THE PROPERTIES INCLUDED RHEOLOGICAL TESTS WITH THE MICROVISCOMETER. A CASE FOR THE ADOPTION OF A SPECIFICATION TEST USING OXIDATION STABILITY IS DISCUSSED. /RRL/A/

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Filing Info

  • Accession Number: 00211144
  • Record Type: Publication
  • Source Agency: Road Research Laboratory /UK
  • Files: TRIS
  • Created Date: Apr 27 1970 12:00AM