HOT-MIX COAL-TAR CONCRETE PAVEMENT

THE CONSTRUCTION HISTORY AND INTERIM PERFORMANCE OF AN EXPERIMENTAL PAVEMENT IN WHICH COAL TAR WAS SUBSTITUTED FOR ASPHALT CEMENT IS RELATED. ALL OTHER DESIGN FEATURES WERE BASICALLY SIMILAR TO ASPHALTIC CONCRETE PAVING PROJECTS ABUTTING EACH END OF THE EXPERIMENTAL SECTION. THE RESULTING TAX MIXTURES WERE IN GENERAL CONFORMITY WITH MIXES 4T (BASE) AND 7T (SURFACE) OF ASTM D 1753-67. ALTHOUGH THE MARSHALL STABILITY WAS 3000 POUNDS AT 100 F, THE TAR SURFACE COURSE HAS THINNED IN THE WHEEL TRACKS AND THICKENED OUTSIDE THE WHEEL PATHS. TAR MIXES HAVE INSUFFICIENT STRENGTH TO WITHSTAND TESTING AT 140 F. THE GREATER SENSITIVITY OF THE TAR TO SUMMER TEMPERATUES, TOGETHER WITH VERY HEAVY WHEEL LOADS, EXPLAIN THE GREATER RUTTING OCCURRING IN THE TAR SURFACE THAN IN THE ASPHALT SECTIONS. ONLY THE HEAVY WHEEL LOADS WERE UNANTICIPATED. REFLECTION MEASUREMENTS INDICATE THAT THE TAR CONCRETE PAVEMENT IS OTHERWISE COMPARABLE TO THE TWO ASPHALTIC CONCRETE PAVEMENTS. LEVELS OF THE EXISTING SURFACE, TOGETHER WITH AN INSULATING OVERLAY OF ASPHALTIC CONCRETE, SHOULD RESTORE THE PAVEMENT TO NORMAL SERVICE CAPABILITIES.

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Filing Info

  • Accession Number: 00211688
  • Record Type: Publication
  • Files: TRIS, STATEDOT
  • Created Date: Oct 10 1971 12:00AM