00469502

Component

http://onlinepubs.trb.org...trr/1987/1131/1131-004.pdf

https://scholar.google.co...ters&publication_year=1987

The traditional method of selecting ballast has been based on physical testing of representative specimens to ensure that materials have adequate wearing resistance, toughness, physical stability, and strength to meet predetermined criteria. Sufficient testing is normally done to ensure that the ballast supply meets these criteria. Most tests are meant to establish that the ballast is durable at the time it is tested. Tests such as magnesium sulphate soundness or abrasion resistance give indirect evidence of how the ballast properties can be expected to change in the track structure. None of the tests currently employed, with the exception of gradation, gives direct information to explain the physical behavior and chemical stability of a ballast source, nor do they give any guidance that the engineer can use in selecting the most economical gradation or processing method for that source. The main objective of this paper is to demonstrate a rational methodology for the selection of natural rock ballast sources. To obtain the most cost-effective investment in ballast, source selection, site investigation, quarry design, quality control, and selection of specifications should be based on the geologic characteristics of the source.

Publication of this paper sponsored by Committee on Railway Maintenance. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved

01418149

pp 26-34

1987

Transportation Research Record

0309045150

Print

Figures (8) ; Maps (1) ; References (6) ; Tables (7)

Aggregates by source; Ballast (Railroads); Chemical properties; Geology; Physical properties; Production; Quality control; Quarries; Specifications; Testing

Aggregate sources; Ballast; Selecting; Site investigation

Geotechnology; Highways; Railroads; I36: Aggregates

TRIS, TRB, ATRI

Jul 31 1988 12:00AM

• APPLICATION OF PETROGRAPHIC ANALYSIS TO BALLAST PERFORMANCE EVALUATION
• COMPONENT IDENTIFICATION AND INVENTORY OF U.S. ARMY RAILROAD TRACKAGE
• EFFECTS OF PARTICLE CHARACTERISTICS ON BEHAVIOR OF GRANULAR MATERIAL
• EVALUATION OF BALLAST MATERIALS USING PETROGRAPHIC CRITERIA
• PERFORMANCE OF LARGE-SCALE MODEL SINGLE TIE-BALLAST SYSTEMS
• RAILROAD TRACK STRUCTURE PERFORMANCE UNDER WHEEL IMPACT LOADING
• SUBGRADE AND BALLAST REQUIREMENTS FOR 125-TON CARS
• TRACK COMPONENTS FOR 125-TON CARS
• TRACK EVALUATION AND BALLAST PERFORMANCE SPECIFICATIONS
• USE OF GEOSYNTHETICS IN THE DESIGN OF RAILROAD TRACKS