3-D Degradation analysis of railroad ballast |
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Authors: | Pasi Tolppanen Ove Stephansson Lars Stenlid |
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Affiliation: | Division of Engineering Geology, Royal Institute of Technology, 100 44 Stockholm, Sweden, Skanska Sverige AB, V?gtekniskt Centrum Nord, 74650 B?lsta, Sweden,
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Abstract: | Degradation behaviour of aggregate particles of the size of railroad ballast (32–63 mm) is examined using Los Angeles (LA)
milling and 3-D scanning techniques. Seven different rock types were tested at four stages of milling. For the analytical
geometry and topography characterization, a new method based on Fourier and power spectra was used. The results are compared
with those obtained using geometrical methods and traditional manual measurements. Diminishing of surface roughness and dimensions
is evident. The change in roughness was 20–35% and for maximum dimensions of less than 10% in the case of hard rock types.
The LA value was less than 15. For the weaker particles values of more than 40% and more than 20%, respectively, were obtained.
The fractal dimension approached a value of 2 as a function of milling rates.
Electronic Publication |
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Keywords: | Ballast Degradation Roughness Size Shape 3-D Laser scanning Los Angeles test |
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