Asphalt Underlayment Highway/Railway At-Grade Crossings: Designs, Applications, and Long-Term Performance Evaluations
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2017-09-28
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Abstract:Historically, highway/railway at-grade crossings have been expected to deteriorate at a faster rate and require reconstruction at more frequent intervals than the adjacent pavement and open-track. Structurally, railways and highways are typically designed very differently, but must co-exist within the common area of the crossing. When the roughness and deterioration of the crossing adversely affects the safety and reasonable traffic operations across the crossing, the crossing must be removed and replaced at high cost and inconvenience to the traveling public and railroad operations. If the crossing is replaced using similar materials and techniques, this can assure the occurrence of a similar series of events. This report describes contractual arrangements, guidelines, standards, and design practices used by representative public transportation agencies and railroad companies to rehabilitate a grade crossing using asphalt underlayment technology. Detailed documentations of long-term performance evaluations of asphalt underlayment crossings are described and discussed for these selected state DOTs, public commuter/transit lines, and freight railroads involved with the development and adoption of this technology for various operating conditions throughout the United States. Evaluations are conducted for crossings consisting of the eight most common types of crossing surfaces.
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