EMULSIFIED PETROLEUM OILS AND RESINS IN RECONSTITUTING ASPHALTS IN PAVEMENTS

ASPHALTS IN PAVING MIXTURES CHANGE IN COMPOSITION, OR AGE, WITH TIME. THE RATE AND DEGREE OF CHANGE DEPENDS ON THEIR CHEMICAL COMPOSITION, ENVIRONMENTAL CONDITIONS, AND LENGTH OF EXPOSURE. IN THE CASE OF HOT-PLANT MIXES, THE AGING PROCESS STARTS EVEN BEFORE PAVEMENT CONSTRUCTION BECAUSE OF EXPOSURE TO AIR AT HIGH TEMPERATURES IN THIN FILMS DURING THE HOT-MIX CYCLE. SOONER OR LATER THE ASPHALT WILL REACH A STATE OF BRITTLENESS WHICH MANIFESTS ITSELF IN THE FORM OF PITTING AND RAVELING OF THE SURFACE OR SHRINKAGE AND BRITTLENESS CRACKING, WITH EVENTUAL SPALLING. ADDITION OF SUITABLE ASPHALT COMPONENTS AT THE APPROPRIATE TIME DURING THE AGING PROCESS CAN STOP AGING BY RECONSTITUTION OF THE WEATHERED ASPHALTS. APPROPRIATE TREATMENT OF PAVEMENTS RETURNS THE WEATHERED ASPHALT TO ITS ORIGINAL CONDITION. IN MANY INSTANCES, THE PROPERTIES OF THE ASPHALTS ARE SO IMPROVED THAT THEY SURPASS THOSE IN THE ASPHALT PRIOR TO MIXING WITH THE AGGREGATE. LABORATORY DATA ILLUSTRATE THE MANNER OF AGING OF ASPHALTS AND THE CONCEPT OF RESTORING PROPERTIES BY USE OF SELECTED FRACTIONS OF PETROLEUM OILS AND RESINS. REASONS ARE CITED FOR THE SELECTION OF AN EMULSION SYSTEM FOR BRINGING TOGETHER THE AGED ASPHALT AND THE PARTICULAR OILS AND RESINS.

• Record URL:
  • http://onlinepubs.trb.org/Onlinepubs/hrr/1963/24/24-004.pdf
• Supplemental Notes:
  • 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:
  • Vallerga, B A
• Publication Date: 1963

Media Info

• Media Type: Print
• Features: Appendices; Figures; References; Tables;
• Pagination: pp 62-105
• Monograph Title: Bituminous materials and mixtures
• Serial:
  • Highway Research Record
  • Issue Number: 24
  • Publisher: Highway Research Board

Subject/Index Terms

• TRT Terms: Asphalt; Asphalt pavements; Bituminous mixtures; Chemical composition; Crash exposure; Crude oil; Dispersers; Emulsified asphalt; Emulsions; Environment; Hot mix asphalt; Materials selection; Resins; Time; Weathering
• Uncontrolled Terms: Exposure
• Old TRIS Terms: Aging; Emulsification; Reconstitution
• Subject Areas: Highways; Materials; Safety and Human Factors;

Filing Info

• Accession Number: 00210260
• Record Type: Publication
• Files: TRIS, TRB
• Created Date: Jul 8 1994 12:00AM