Title

Effects of Parallel Gradation on Strength Properties of Ballast Materials

Abstract

The railroad ballast is used to fill in irregular surface topology, distribute and transfer loads from a surface structure or system to the subgrade or subsoils as uniformly and widely as possible in order to provide stable and stiff long-term embankment support for railways. A typical ballast grain sizes range from 30 to 70 mm, which makes large-scale laboratory tests difficult to conduct. The parallel gradation technique is to preserve the particle shape, particle surface roughness, and particle mineralogy, and creates a parallel gradation of soil with a maximum particle size for the available apparatus. This paper presents the result of a series of monotonic direct shear tests for three ballast materials having parallel gradation curves, which are served as background study for the ongoing research on validating it under loading-unloading condition.

Department(s)

Civil, Architectural and Environmental Engineering

Keywords and Phrases

Ballast; Material Properties

Library of Congress Subject Headings

Embankments
Railroad tracks

Document Type

Article - Conference proceedings

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2007 American Society of Civil Engineers (ASCE), All rights reserved.


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