Technical Reports

Ballast Experiments at the Facility for Accelerated Service Testing Status Report

  • 01
  • Jun
  • 1982
AUTHOR: Bruce N. Bosserman
KEYWORDS: Ballast, Subgrade, Ballast Gradation, Track Maintenance, Ballast Depth, Track Geometry, Ballast Shoulder Width
ABSTRACT: This report presents a summary of the Facility for Accelerated Service Testing (FAST) Ballast Experiments. Tests included ballast shoulder width~ (Section 15J, ballast type and depth (Sections 18 and 20), ballast typed (Section 03, wood tie;>!; Se.ction1'7, concrete ties), comparison of effects of Northeast Corridor wood vs concrete tie design on ballast and subgrade~ (Section 22), and geotextiles~(Section17) . The ballast shoulder width test demonstrated that increased ballast shoulder width can provide. increased track geometry retention and reduced maintenance. Slag ballast exhibited the best performance in Section 20, and limestone the worst. Comparing Sections 03 and 17, concrete track showed higher track modulus, less total settlement and ballast degradation than wood tie track. In Section 22, ballast degradation and total settlement were approximately equal between wood and concrete ties. Dynamic loading applied to the subgrade and dynamic subgrade deformation were higher for wood ties. Geotextile penetration resistance and ballast stiffness varied considerably with fabric type.