BALLAST AND FOUNDATION MATERIALS RESEARCH PROGRAM. PHASE IV. MATERIALS EVALUATION STUDY

This report presents the results of Phase 4 - Materials Evaluation Study, of the Ballast and Foundation Materials Research Program. Emphasis is on characterizing the response of the structural support elements (subgrade, subballast, and ballast) with respect to in service loading conditions. Properties of the subgrade, the subballast, and the ballast that significantly influence track structure behavior and performance have been identified. Part A of the report includes the evaluation of the resilient (elastic) response and permanent strain response of 7 ballast and subballast materials. Part B contains plastic strain and degradation results of ballast materials subject to long term (1 million repetitions) loading. Part C includes the evaluation of resilient response and permanent strain response of ten subgrade soils. Thermal regime characterization, including freeze-thaw analysis is presented in Part D. A comprehensive summary and conclusions are given in Part E.

Media Info

  • Pagination: 324 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00151837
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: FRA-ORD-77/02 Tech Rpt.
  • Contract Numbers: DOT-FR-30038
  • Files: NTIS, TRIS, USDOT
  • Created Date: May 11 1977 12:00AM