Evaluation of Spray Injection Patching

About the report:

A preliminary telephone survey of users of spray injection patching equipment revealed general satisfaction. In addition, a demonstration and follow-up 2-month evaluation of a rented truck-mounted unit convinced Virginia Department of Transportation officials to purchase a unit for a more detailed evaluation. The purchased unit was evaluated over a 2.5-year period with respect to cost-effectiveness of repairs, effectiveness during cold temperatures, and potential increased worker safety. The unit worked well and produced durable patches, even during cold temperatures. It was important to use clean aggregate and a different type of emulsion during extremely cold temperatures. A cost-benefit analysis indicated that patches installed by the spray injection unit were more cost-effective than repairs using the skin patching technique. Fewer workers were exposed directly to traffic during the operation, which is a potential benefit, especially on highways with considerable traffic. The unit may be preferable and perhaps necessary where the number of available personnel is limited.

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