THE USE OF FOAMED ASPHALT IN BITUMINOUS STABILIZATION OF BASE AND SUBBASE MATERIALS AND RECYCLED PAVEMENT LAYERS
Part I of this report is an overview of this project. It summarizes the task findings. The foaming characteristics of asphalt must be established by tests for foaming volume and foam life in order to find that optimum asphalt for use. With recycled material, excellent Marshall stabilities were obtained. Detailed mix design procedures were created for foamed mixtures, and these are contained herein. Somewhat lower asphalt contents were required with foamed mixtures, but water-sensitivity durability appeared to be low. Part II represents the detailed report on the study of the durability of the foamed asphalt mixtures relative to a) soaking in water; b) cycles of soaking and freezing and thawing. Asphalt contents "at-optimum" and 1 percent above optimum were used as were 3 additives to improve durability; a) lime; b) indulin; c) silane. The non-destructive pulse-velocity test gave results that appear to be related to Marshall stabilities; it showed great promise for use in such studies. Durability, strength, and longevity were improved with 1-2 percent lime additives to such an extent that generally less suitable material (e.g., pit-run gravel, or outwash sand) may rival a generally more suitable material (e.g. crushed limestone). Foamed asphalt does appear to be a viable alternative material for bituminous stabilization. (Author)
- Conducted in cooperation with the Federal Highway Administration under a research study entitled, The Use of Foamed Asphalt in Bituminous Stabilization of Base and Subbase Materials and Recycled Pavement Layers.
Purdue University/Indiana Department of Transportation JHRPPurdue University, School of Civil Engineering
West Lafayette, IN United States 47907-1284
Washington, DC United States 20590
- Wood, L E
- Altschaeffl, A G
- Cravens Beaudoin, C M
- Castedo, L H
- Publication Date: 1984-3
- Features: Appendices; Figures; References; Tables;
- Pagination: 180 p.
- TRT Terms: Additives; Asphalt content; Calcium oxide; Durability; Foamed asphalt; Freeze thaw durability; Marshall test; Pavement layers; Pavements; Pulses; Recycling; Sensitivity; Soil stabilization; Subbase materials; Velocity; Water
- Uncontrolled Terms: Pulse velocity; Stabilization
- Old TRIS Terms: Marshall stability marshall stability & flow test flow; Recycled pavements
- Subject Areas: Geotechnology; Highways; Materials; Pavements; I31: Bituminous Binders and Materials;
- Accession Number: 00391666
- Record Type: Publication
- Report/Paper Numbers: FHWA-IN-JHRP-84-5 Final Rpt.
- Contract Numbers: 1(21) Part II
- Files: TRIS, ATRI, USDOT
- Created Date: Jan 30 1988 12:00AM