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South Dakota Department of Transportation
Project Synopsis
SD2003-08


Title: Interstate 90 Noise Reduction by Skidabrasion
Project Researcher: Dan Johnston, SDDOT
Project Manager: Dave Huft
Research Period: -
Status: Approved
Cost: $0.00

Problem Statement:Since its construction in 2001, a section of Portland cement concrete paving on Interstate 90 near Exit 57 in Rapid City has exhibited a pronounced whine under traffic, apparently caused by the surface tining. Noise levels exceed federal standards, which the South Dakota Department of Transportation has adopted. The Rapid City Area office of the Department considered several options for reducing noise levels, including diamond grinding of the concrete surface to remove the tining and thin asphalt concrete overlay to cover it. A more economical alternative suggested by the Office of Research was to remove the tining by "Skidabrasion", a proprietary method of the Humble Equipment Company.

Skidabrasion removes material by projecting high-speed steel shot at the pavement surface. By controlling the Skidabrader power and travel rate, the method can be set to remove only rubber (such as in airport runway restoration) or substantial pavement thickness. The Skidabrader vacuums the shot and loose material from the pavement surface, recovers the shot, and cleanly disposes of the waste. The process can be accomplished at night, when traffic levels are reduced. Most importantly, Skidabrasion leaves a surface with good texture and friction, which is essential on the limestone-aggregate pavement.

Because its lower cost and its ability to create desirable pavement friction, Rapid City Area has chosen to use Skidabrasion to remove enough tining to reduce noise levels on this section of roadway. Research is needed to establish the proper level of Skidabrasion and to evaluate its short- and long-term effectiveness in reducing pavement noise and maintaining pavement friction. The research would also attempt to determine why this pavement exhibited uncharacteristically high noise levels compared to other recently placed pavements.

Findings:
Title: Interstate 90 Noise Reduction by Skidabrasion
Project Researcher: Dan Johnston, DOT
Project Manager: Dave Huft
Research Period: -
Status: Approved
Cost: $0.00

Problem Statement:Since its construction in 2001, a section of Portland cement concrete paving on Interstate 90 near Exit 57 in Rapid City has exhibited a pronounced whine under traffic, apparently caused by the surface tining. Noise levels exceed federal standards, which the South Dakota Department of Transportation has adopted. The Rapid City Area office of the Department considered several options for reducing noise levels, including diamond grinding of the concrete surface to remove the tining and thin asphalt concrete overlay to cover it. A more economical alternative suggested by the Office of Research was to remove the tining by "Skidabrasion", a proprietary method of the Humble Equipment Company.

Skidabrasion removes material by projecting high-speed steel shot at the pavement surface. By controlling the Skidabrader power and travel rate, the method can be set to remove only rubber (such as in airport runway restoration) or substantial pavement thickness. The Skidabrader vacuums the shot and loose material from the pavement surface, recovers the shot, and cleanly disposes of the waste. The process can be accomplished at night, when traffic levels are reduced. Most importantly, Skidabrasion leaves a surface with good texture and friction, which is essential on the limestone-aggregate pavement.

Because its lower cost and its ability to create desirable pavement friction, Rapid City Area has chosen to use Skidabrasion to remove enough tining to reduce noise levels on this section of roadway. Research is needed to establish the proper level of Skidabrasion and to evaluate its short- and long-term effectiveness in reducing pavement noise and maintaining pavement friction. The research would also attempt to determine why this pavement exhibited uncharacteristically high noise levels compared to other recently placed pavements.

Findings:

Research Objectives:
1  To evaluate the short- and long-term effectiveness of Skidabrasion in reducing noise and maintaining pavement friction on Interstate 90 near Exit 57.
2  To compare the cost and effectiveness of Skidabrasion to diamond grinding which has been previously applied to a portion of the pavement.
3  To investigate why the existing pavement generated unusually high levels of noise.

Research Tasks:
1  Meet with the project's technical panel to review project scope and work plan.
2  Measure noise levels, profile and texture, and other indicators of friction of the existing pavement prior to treatment.
3  Through interviews of contractor and inspection personnel involved in the original construction of the pavement and analysis of pavement characteristics, identify potential causes of high noise levels in the original pavement.
4  Assist construction personnel to determine power and treatment rates that effectively remove noise without excessive loss of pavement thickness.
5  Measure noise levels, profile and texture, and other indicators of friction of the pavement immediately after treatment.
6  Prepare and submit a technical memorandum summarizing the treatment and initial results.
7  Measure noise levels, profile and texture, and other indicators of friction of the existing pavement one year after treatment.
8  Prepare and submit a technical memorandum summarizing the results after one year of use.
9  Measure noise levels, profile and texture, and other indicators of friction of the existing pavement three years after treatment.
10  Prepare and submit a technical memorandum summarizing the results after three years of use.
11  Prepare a final report and executive summary of the research methodology, findings, conclusions, and recommendations.
12  Prepare and make an executive presentation to the SDDOT Research Review Board at the conclusion of the project.

Documents Available:

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