United States Department of Transportation
i
Impact of changes in profile measurement technology on QA testing of pavement smoothness : project summary.
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2013-08-31
[PDF-262.25 KB]
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Alternative Title:0-6610: Impact of changes in profile measurement technology on QA testing of pavement smoothness : project summary.
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Abstract:For quality assurance testing, the Texas Department of Transportation’s (TxDOT’s) Item 585 ride specification includes pay adjustment schedules that are tied to the average international roughness index (IRI), and a procedure to locate defects based on measured profiles. The acceptance criteria in Item 585 are based on measurements collected with traditional single-point lasers. Since its implementation, profilers with multi-point and wide-footprint lasers have become available. The impact of these new lasers on ride quality assurance tests needs to be investigated.
To identify defects, Item 585 implements a methodology that checks the deviations between the average profile and its 25-ft moving average against a specified threshold. However, some districts have taken the additional step of using a bump rating panel to select the bumps and dips to be corrected based on the panel’s opinion of defect severity. A standard methodology needs to be developed to maintain consistency in ride quality assurance testing. This project:
1. Established the impact of multi-point and wide-footprint lasers on the department’s implementation of its existing ride specifications (Phase I).
2. Investigated the existing methodology for evaluating localized roughness (Phase II).
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