This installment describes a stabilization fabric, Typar, which is a nonwoven sheet formed of continuous filaments of 100 percent polyprolene that are directionalized preferentially in the length and width directions of the sheet and spunbonded at filament junctions. Typar is inserted between ballast and subgrade where it facilitates drainage by allowing water to move upward while filtering out fines which would foul ballast. It is also able to spread the load through the subgrade. This support membrane has been used under two miles of Illinois Central Gulf mainline and for a temporary shoo-fly track in New York State for an overpass project. Details of installation are given.

  • Availability:
  • Supplemental Notes:
    • See related articles in nos. 7 and 9, RRIS 00 141119 and 141563.
  • Corporate Authors:

    Simmons-Boardman Publishing Corporation

    508 Birch Street
    Bristol, CT  United States  06010
  • Publication Date: 1976-10

Media Info

  • Features: Photos;
  • Pagination: p. 22-23
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00142951
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Dec 15 1976 12:00AM