Current construction procedures and long-term performance of railroad trackbeds that incorporate a layer of hot-mix asphalt (HMA) as an underlayment or overlayment are highlighted. Both techniques are applicable for new construction or rehabilitation of existing trackbeds. Specifically addressed herein are the following: (a) optimum HMA mixture design guidelines, (b) long-term HMA mixture characterization in the trackbed environment, (c) typical construction and rehabilitation procedures, (d) documented performances of selected installations, (e) economic benefits and comparisons with conventional designs, (f) structural design standards, and (g) discussion of the inferred advantages and relative applicability of HMA trackbeds. HMA trackbeds, which currently number in the hundreds in this country, are performing extremely well under widely varying traffic, roadbed and environmental conditions. The initial economics of using HMA is attractive, and indications are that the long-term savings in maintenance and operating costs can be substantial when compared with conventional construction and rehabilitation techniques. It is anticipated that the use of HMA trackbeds will increase in this country and throughout the world during the coming years as railroads resume a greater role in the transportation system. This will require the highest quality trackbeds for efficient and economical operations of intercity freight and the expected expansion of inter- and intracity passenger systems.

Media Info

  • Features: Figures; References; Tables;
  • Pagination: p. 35-44
  • Monograph Title: Asphalt pavement and surface treatments: construction and performance 1991
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00615711
  • Record Type: Publication
  • ISBN: 0309051088
  • Files: TRIS, TRB
  • Created Date: Sep 30 1991 12:00AM