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Title: ASPHALT TRACKBED TECHNOLOGY DEVELOPMENT
Accession Number: 00800109
Record Type: Component
Record URL: Availability: Transportation Research Board Business Office 500 Fifth Street, NW Find a library where document is available Abstract: The evolution of hot-mix asphalt (HMA) trackbed technology is documented as presently practiced in the United States. Criteria used in selecting sites for and the attendant benefits of HMA trackbeds, based on long-term performance evaluations, are discussed. Prevailing practices for selecting ideal HMA mix parameters, trackbed section designs, and application procedures are described in detail. Primary attention is directed at the "underlayment" procedure in which the HMA serves as a premium subballast layer within the track structure to enhance the support, waterproofing, and confinement properties of the subballast. The roadbed or subgrade materials underlying the HMA mats maintain near-optimum moisture content. The HMA appears to undergo little if any weathering or deterioration in the trackbed environment. The resultant benefits are decreased maintenance costs, fewer slow orders, fewer operational interferences, and improved operational efficiency of the rail network overall.
Supplemental Notes: This paper appears in Transportation Research Record No. 1713, Railroad Track Engineering and Maintenance; Passenger Rail Planning and Operations.
Language: English
Corporate Authors: Transportation Research Board 500 Fifth Street, NW Authors: Rose, J GBrown, E ROsborne, M LPagination: p. 1-9
Publication Date: 2000
Serial: ISBN: 0309066921
Features: Figures
(3)
; Photos
(6)
; References
(10)
; Tables
(5)
TRT Terms: Uncontrolled Terms: Subject Areas: Geotechnology; Highways; Railroads
Files: TRIS, TRB
Created Date: Oct 5 2000 12:00AM
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