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South Dakota Department of Transportation
Project Synopsis

Title: Process Evaluation of Spray Injection Method for Asphalt Surface Repair
Project Researcher: Richard Reid, SDSU
Project Manager: Jon Becker
Research Period: 5/1/1997 - 10/31/1998
Cost: $18,000.00

Problem Statement: There is increased pressure on maintenance personnel to do more work with a reduced labor force. One method of reducing manpower without cutting production is the use of a spray injection method for asphalt surface repair. Although the benefits of using this method have been well documented by previous research such as SHRP Report H-353 Innovative Materials Development and Testing, there are some unsolved problems unique to its use in South Dakota. Specifically, the emulsions necessary for the 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 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 greatest productivity of spray injection technology. This may require a cooperation between SDDOT Regions, Areas and also local governments. Currently, the alternatives for winter patching are cold mix throw and roll which is considered a temporary fix or repairs made with specialty mixes which have a longer life expectancy but at a much higher cost.

Findings: The researcher did establish that spray injection is an effective method for better utilizing personnel to make pothole patches that last considerably longer than those using manual methods. Because of manpower savings and better patching, the method is cost-effective. Regarding training, the researcher did not recommend a course outline, but discussed how manufacturers and users of spray injection equipment can successfully train operators. Hands-on training is preferable to classroom training. Overall, the panel felt the research produced an effective report that will be helpful to the Department regarding spray injection applications.

Research Objectives:
1  Outline methods for coordinating the use of spray injection asphalt repair equipment, storage facilities, and materials within the department and local government maintenance forces.
2  Identify cost effective methods for year round storage and handing of materials used with spray injection asphalt repair.

Research Tasks:
1  Meet with the technical panel to review project scope and work plan.
2  Conduct literature search to identify spray injection asphalt repair equipment vendors, material sources, and material storage and handling requirements.
3  Review existing spray injection repair processes used by DOT’s and other maintenance units both in South Dakota and in adjacent states to assist in satisfying the following five tasks.
4  Recommend proper material supply and storage methods particularly noting winter operations (check with City of Sioux Falls for one).
5  Identify scheduling management needs with respect to emergency use and general highway maintenance through interviews with state and local jurisdictions.
6  Identify opportunities for interagency cooperation (sharing units and materials between state, county and city maintenance forces) to enhance efficiency and productivity.
7  Identify initial and ongoing training required, including a course outline, for specific spray injection systems.
8  Identify system acquisition and operational costs and provide maintenance requirements.
9  Produce cost/benefit analysis of manual methods versus various machine methods truck mounted and trailer mounted) considering signing, traffic control requirements and material storage. Include factors such as patch life, materials costs and other p
10  Prepare a final report and executive summary of the literature review, research methodology, findings, conclusions, and recommendations.
11  Make an executive presentation to the SDDOT Research Review Board at conclusion of the project.

Documents Available:

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