HARDENING OF ASPHALT IN HOT BITUMINOUS MIXES DURING THE HAULING PROCESS

THE EFFECT OF ASPHALT HARDENING /IN HOT BITUMINOUS MIXES/ DURING HAULING ON THE BRITTLENESS AND LIFE OF AN ASPHALT CEMENT PAVEMENT IS BEING DETERMINED. MIX SAMPLES WERE TAKEN FROM HOT BITUMINOUS MIXES AT DIFFERENT TIMES AFTER PREPARATION AND FROM DIFFERENT SOURCES OF CRUDE. VISCOSITY MEASUREMENTS WERE MADE AT DIFFERENT TEMPERATURES TO DETERMINE ASPHALT HARDNESS. PENETRATION AND DUCTILITY TESTS WERE ALSO CONDUCTED. TO PROVIDE SOME INDICATION OF MOLECULAR CHANGES, THIN ASPHALT FILMS WERE PLACED BETWEEN SODIUM CHLORIDE PLATES AND TESTED ON AN INFRARED SPECTOPHOTOMETER. SIGNIGICANT HARDENING OCCURRED IN ALL OF THE ASPHALTS STUDIED. THE EXTENT OF HARDENING VARIED WITH THE ASPHALT SOURCE. ALSO ASPHALT VISCOSITIES VARIED SIGNIFICANTLY WITH THE POSITION AND DEPTH FROM WHICH THE MIX SAMPLE WAS TAKEN FROM THE TRUCK BED. ASPHALT SAMPLES TAKEN FROM THE UPPERMOST 1 IN. WERE GENERALLY SOFTER THAN THOSE IN THE REMAINDER OF THE MIX. ASPHALT DUCTILLITY DECREASED WITH INCREASE IN HAUL TIME.

• Record URL:
  http://onlinepubs.trb.org/Onlinepubs/hrr/1966/132/132-002.pdf
• Supplemental Notes:
  • Paper sponsored by Committee on Construction Practice--Flexible Pavement and presented at the 45th Annual Meeting. 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:
  • Wright, Paul H
  • Paquette, Radnor J
• Publication Date: 1966

Media Info

• Media Type: Digital/other
• Features: Figures; References; Tables;
• Pagination: pp 10-28
• Monograph Title: Bituminous concrete construction
• Serial:
  • Highway Research Record
  • Issue Number: 132
  • Publisher: Highway Research Board

Subject/Index Terms

• TRT Terms: Asphalt cement; Asphalt hardening; Asphalt pavements; Bituminous mixtures; Brittleness; Crude oil; Ductility; Ductility tests; Hot mix asphalt; Infrared radiation; Life span; Mixtures; Molecular structure; Sampling; Soil penetration test; Spectrophotometers; Temperature; Time; Trip length; Viscosity
• Old TRIS Terms: Haul time; Infrared spectrophotometers; Viscosity test
• Subject Areas: Construction; Highways; Materials; Society;

Filing Info

• Accession Number: 00210312
• Record Type: Publication
• Files: TRIS, TRB
• Created Date: Nov 18 1994 12:00AM