United States Department of Transportation
i
Centerline Rumble Strip Effects on Pavement Performance
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2023-06-01
[PDF-14.66 MB]
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Abstract:Despite numerous research studies inspecting the safety benefits of CLRS on pavements, there has been limited exploration into the impact on pavement durability as a result of the installation of CLRS. The major purpose of this study was to corroborate what specific factors are controlling the cracking failures due to the installation of CLRS and find solutions to mitigate CLRS-related failures on the roadway. The first component of the study was Finite Element Analysis (FEA) modeling. FEA was conducted to simulate moving tire loads over a full-scale asphalt pavement section containing CLRS. The optimal CLRS configuration included sinusoidal rumble strips installed adjacent to the longitudinal joint with a shorter wavelength. The FEA results verified the findings of the laboratory testing while allowing for the examination of additional factors not tested in the laboratory component of this study. In the second phase of this study, a test strip was constructed at the Knife River facility in Corvallis, Oregon where CLRS were milled into the asphalt pavement. The primary findings showed that sinusoidal CLRS had optimal performance, shallower and smaller rumble strips had a less structural impact, and chip seal surface treatment is an effective method to prevent moisture infiltration, which is expected to be a major factor controlling CLRS performance. The next portion of the study was X-ray Computed Tomography (CT) imaging to determine the presence of microcracks in the asphalt pavement due to rumble strip milling. Results demonstrated the presence of microcracks at all milled rumble strip locations. This finding pointed out the importance of applying a surface treatment on the CLRS right after installation to reduce moisture-related cracking failures. Potential failure mechanisms and construction recommendations were developed based on the results of laboratory testing, X-ray CT imaging, and FEA.
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