STABILIZATION WITH FOAMED ASPHALT OF AGGREGATES COMMONLY USED IN LOW-VOLUME ROADS

Foamed asphalt, which is generated by combining asphalt cement and cold water through a foam nozzle, has been used worldwide as a means of stabilizing pavement construction materials. A review of the literature indicated a successful and broad use of foamed asphalt in low-volume-road construction. This relatively new concept appears to exhibit several characteristics that could lead to increased use of locally available materials as well as a more economical stabilization process without some detrimental features associated with other agents. The effects of different variables on foamed-asphalt mix design (Foamix) were investigated in a laboratory study. An AC-20 asphalt cement was used as the binder material. The aggregates included in the study were outwash, sand, pit-run gravel, and crushed stone. The variables studied were foamed-asphalt content (two levels), moisture content (three levels), curing period (three levels), testing temperature (two levels), and mixing temperature (three levels). Foamix was found to be significantly affected by water infiltration. Water-sensitivity results indicated that saturated strengths were much lower than corresponding cured strengths. Specimens fabricated at the highest bitumen content showed a greater resistance to water. In addition, moisture content (at mixing), bitumen content, and total fluid content all proved to have an effect on mixture performance. Foamix strengths increased with curing time, particularly from one to three days. It appears that foamed asphalt can be used as a stabilizing agent for commonly available virgin aggregates as well as recycled material when adequate drainage and/or sealing is provided or when they are located in relatively dry environments. (Author)

• Record URL:
  • http://onlinepubs.trb.org/Onlinepubs/trr/1983/898/898-045.pdf
• Record URL:
  • https://scholar.google.com/scholar_lookup?title=STABILIZATION+WITH+FOAMED+ASPHALT+OF+AGGREGATES+COMMONLY+USED+IN+LOW-VOLUME+ROADS&author=L.+Castedo+F&author=L.+Wood&publication_year=1983
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/0309035112
• Supplemental Notes:
  • Publication of this paper sponsored by Committee on Low-Volume Roads. 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
• Corporate Authors:

  Transportation Research Board

  500 Fifth Street, NW
  Washington, DC  United States  20001
• Authors:
  • Castedo F, L Humberto
  • Wood, Leonard E
• Conference:
  • Third International Conference on Low-Volume Roads
  • Location: Tempe Arizona, United States
  • Date: 1983-7-24 to 1983-7-28
• Publication Date: 1983

Media Info

• Media Type: Print
• Features: Figures; References; Tables;
• Pagination: pp 297-302
• Monograph Title: LOW-VOLUME ROADS: THIRD INTERNATIONAL CONFERENCE, 1983
• Serial:
  • Transportation Research Record
  • Issue Number: 898
  • Publisher: Transportation Research Board
  • ISSN: 0361-1981

Subject/Index Terms

• TRT Terms: Aggregates; Asphalt content; Concrete curing; Crushed rock; Foamed asphalt; Gravel; Low volume roads; Moisture content; Sand; Soil stabilization; Strength of materials; Temperature
• Uncontrolled Terms: Stabilization
• Subject Areas: Design; Geotechnology; Highways; Materials; Pavements; I22: Design of Pavements, Railways and Guideways;

Filing Info

• Accession Number: 00376562
• Record Type: Publication
• ISBN: 0309035112
• Report/Paper Numbers: N908
• Files: TRIS, TRB
• Created Date: Aug 30 1983 12:00AM