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The contents of this report reflect the views of the author(s), who is responsible for the facts and the accuracy of the data presented herein. The contents do not necessarily reflect the official views or policies of the Virginia Department of Transportation, the Commonwealth Transportation Board, or the Federal Highway Administration. This report does not constitute a standard, specification, or regulation. Any inclusion of manufacturer names, trade names, or trademarks is for identification purposes only and is not to be considered an endorsement.


Evaluation of Spray Injection Patching
Payne, Charles W.
G. W. Maupin, Jr.
Year: 2003
VTRC No.: 03-TAR11
Abstract: 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.