00376562

Component

http://onlinepubs.trb.org...s/trr/1983/898/898-045.pdf

https://scholar.google.co...Wood&publication_year=1983

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)

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

00380954

N908

pp 297-302

1983

Transportation Research Record

Third International Conference on Low-Volume Roads

0309035112

Print

Figures (11) ; References (13) ; Tables (1)

Aggregates; Asphalt content; Concrete curing; Crushed rock; Foamed asphalt; Gravel; Low volume roads; Moisture content; Sand; Soil stabilization; Strength of materials; Temperature

Stabilization

Design; Geotechnology; Highways; Materials; Pavements; I22: Design of Pavements, Railways and Guideways

TRIS, TRB

Aug 30 1983 12:00AM