Railway Ballast Degradation - Main Aspects and Case Studies
DOI:
https://doi.org/10.14295/transportes.v25i3.1340Keywords:
Railway ballast, Ballast degradation, Railway superstructure.Abstract
The ballast layer of a railway structural profile is considered one of the most important elements of the railway structure having a singular role on its mechanical behavior. Due to traffic and maintenance actions, over time, the ballast material tends to degrade. The objective of the paper is to evaluate the ballast degradation evolution in terms of gradation (Non-Uniformity Coefficient), shape and its distinct modes. This paper presents a review concerning ballast degradation and two studies based on degradation laboratory tests in terms of abrasion within an image-based procedure and shearing tests. Generally, the paper showed different degradation modes and an adequate representation of the grains degradation evolution via methods based on abrasion tests with images obtainment and shearing.
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