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Process evaluation of spray injection method for asphalt surface repair
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    One method of reducing manpower without cutting production in highway maintenance is to use the spray injection method for asphalt surface repair. Although the benefits of using this method have been well documented by previous research such as the Strategic Highway Research Program Report H-353, "Innovative Materials Development and Testing," there are some major unsolved problems unique to its use in South Dakota. Specifically, the emulsions necessary for spray injection operation must be maintained at or near room temperature and most have a relatively short shelf life. Emulsions are generally purchased in substantial volumes to keep the shipping costs to a minimum. During the spring and summer months, this poses no problem but in the winter and early spring, when a substantial portion of repair should be done, handling and storage of emulsions is a problem. Another area of interest is the potential for cooperative scheduling and sharing of equipment and materials allowing the greater productivity of spray injection technology. The objective of this research was to determine if spray injection repair assets within the State of South Dakota could be kept in service during all or part of the winter months. This would be done through an evaluation of the spray injection method equipment, material storage and handling requirements, training programs, equipment maintenance requirements, equipment productivity and scheduling, safety and cost analysis. The work included interviews with over twenty organizations involved with the spray injection method for asphalt surface repair. This included spray injection equipment manufacturers, asphalt producers, state and federal highway maintenance organizations, commercial contractors, and storage tank manufacturers. From the information collected from these interviews and a review of previous research in this area, recommendations for proper year round material supply and storage requirements, equipment scheduling methods, opportunities for interagency cooperation, training requirements, acquisition and operation costs, and cost/benefit analysis data were developed or documented.
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