Degradation of railway ballast through large scale triaxial and full scale rail track model tests: comparison with mechanical laboratory tests

The aim of the research was to assess if the standard tests provided a reliable ranking of nine ballast aggregate materials with respect to mechanical strength. Standard tests were compared with the results from large scale triaxial and full scale model tests employed to simulate in-service stress and environment. Four different mechanical strength tests were conducted on nine crushed rock railway ballast types with fixed grading (22.4 - 63 mm) to investigate degradation with respect to breakage and production of fines. The equipment used are the standard tests: Los Angeles Abrasion (31.5-50 mm/10-14 mm) and micro-Deval (31.5-50 mm), large scale repeated load triaxial, and a full scale railway track model test for cyclic loading, all performed in the laboratory environment. The test procedure also included simulation of the impact loading from tamping. Aggregate petrographic tests were used to reveal whether there was any possible rating weakness associated with the mechanical strength. The rock samples were three igneous rocks, four metamorphic rocks and two consolidated/ metamorphosed sedimentary rocks, all fine and medium grained. The results of the study indicate that the three types of mechanical tests rank the ballast samples in three different ways.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/9788232102853
• Corporate Authors:

  Akademika Publishing

  ,    
• Authors:
  • Nålsund, R
  • Tutumluer, E
  • Horvli, I
• Conference:
  • Ninth International Conference on the Bearing Capacity of Roads, Railways and Airfields
  • Location: Trondheim , Norway
  • Date: 2013-6-25 to 2013-6-27
• Publication Date: 2013

Language

• English

Media Info

• Pagination: pp 807-819
• Monograph Title: Bearing capacity of roads, railways and airfields: proceedings of the ninth International Conference on the Bearing Capacity of Roads, Railways and Airfields: Trondheim, Norway 25-27 June 2013. Vol 1-2

Subject/Index Terms

• TRT Terms: Coarse aggregates; Crushing; Embankments; Laboratories; Properties of materials; Railroad tracks; Strength of materials; Tests; Triaxial shear tests
• ITRD Terms: 4559: Ballast; 5176: Comminution; 5176: Crushing; 2801: Embankment; 5176: Fragmentation; 5176: Grinding; 4559: Hardcore; 6237: Laboratory (not an organization); 5925: Properties; 1062: Railway track; 4559: Rubble; 5544: Strength (mater); 6255: Test; 5566: Triaxial
• Subject Areas: Materials; Railroads; I30: Materials;

Filing Info

• Accession Number: 01596577
• Record Type: Publication
• Source Agency: Swedish National Road and Transport Research Institute (VTI)
• ISBN: 9788232102853
• Files: ITRD, VTI
• Created Date: Apr 21 2016 12:33PM