United States Department of Transportation
i
Mitigating ballast fouling and enhancing rail freight capacity.
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2012-11-01
[PDF-23.41 MB]
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NTL Classification:NTL-FREIGHT-FREIGHT;NTL-RAIL TRANSPORTATION-RAIL TRANSPORTATION;
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Abstract:In this report, an application using polyurethane void filling and particle bonding technology for stabilizing ballast is
evaluated. Application of rigid-polyurethane foam (RPF) as an in situ stabilization method does not require premixing
with aggregates, soil, or with water, would not require track shutdown, and reaches 90% full strength in 15 minutes after
application. PSB is found to have suitable mechanical properties for use as a material in track-substructure. Ease of
injection and negligible curing period for PSB makes it an attractive option for railway maintenance, especially for timesensitive
maintenance activities, such as intersections and bridge approaches. Use of PSB stemming from the research
presented in this report can serve as an economically feasible/favorable maintenance approach compared with traditional
methods, such as undercutting, track raising and ballast addition, tamping, etc.; especially for preserving uninterrupted
track operations during track stabilization/enhancement.
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