THE TESTING AND USE OF ROAD TARS

THE EFFECTS OF EVAPORATION, OXIDATION, POLYMERIZATION, WATER AND LIGHT ON TAR ROAD MATERIALS WERE STUDIED. IT WAS FOUND THAT EVAPORATION IS THE MAJOR FACTOR WITH OXIDATION PLAYING A MINOR ROLE. LIGHT WATER AND POLYMERIZATION WERE FOUND TO BE RELATIVELY UNIMPORTANT IN THE WEATHERING OF ROAD TAR. FURTHER STUDIES WERE MADE BY SUBJECTING ROAD TARS TO THE COMBINED EFFECTS OF EVAPORATION AND OXIDATION IN A TEST DESIGNED TO SIMULATE ROAD CONDITIONS WHICH PERMIT WATER AND AIR TO PENETRATE BELOW THE AGGREGATE ON THE SURFACE. THE EFFECTS OF THE TREATMENT WERE STUDIED BY A STABILITY TEST ON A MODIFIED HUBBARD-FIELD STABILITY MACHINE AND A SAND-BLAST WEAR TEST. THUS FAR NO CASE HAS BEEN FOUND IN THESE TESTS WHERE A MIX CONTAINING A PURE BITUMEN HAS SHOWN A DECREASE IN STABILITY AS A RESULT OF WEATHERING. THE RESULTS OF THE WEAR TESTS ON SAMPLES WEATHERED IN A LOOSE CONDITION AND ON SPECIMENS MOLDED UNDER PRESSURE INDICATE THE EFFECT OF SURFACE AREA ON SPEED OF WEATHERING AND EMPHASIZE THE NECESSITY FOR REDUCING THE AMOUNT OF BITUMINOUS SURFACE EXPOSED TO WEATHERING TO A MINIMUM /AUTHOR/

• Record URL:
  https://onlinepubs.trb.org/Onlinepubs/hrbproceedings/16/16-016.pdf
• Supplemental Notes:
  • Vol 16, pp 207-215, 5 FIG, 6 REF. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved.
• Authors:
  • Rhodes, E O
  • Gillander, H E
  • Davies, C
• Publication Date: 1937

Media Info

• Media Type: Digital/other
• Monograph Title: Proceedings of the Sixteenth Annual Meeting of the Highway Research Board Held at Washington, D.C. November 18-20, 1936
• Serial:
  • Highway Research Board Proceedings
  • Volume: 16
  • Publisher: Highway Research Board

Subject/Index Terms

• TRT Terms: Evaporation; Light; Oxidation; Polymerization; Tar; Water; Weathering
• Subject Areas: Highways; Materials;

Filing Info

• Accession Number: 00211546
• Record Type: Publication
• Files: TRIS, TRB
• Created Date: Aug 8 1971 12:00AM