Development of an improved overlay design procedure for Oregon : vol. I, interim report, background and framework.
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1986-12-01
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Abstract:This report is the first in a three-volume series dealing with the development of an improved overlay design procedure for Oregon. This report presents the results of the first-year findings and includes: (1) a detailed review of the literature; (2) the development of the framework for an improved procedure; and (3) an evaluation of data from three projects using several procedures including the proposed AASHTO procedures (NDT methods 1 and 2). The results of this report indicated the following: (1) the AASHTO procedures have several advantages over the presently used ODOT procedure; (2) the major limitation of the AASHTO procedure is lack of reliable backcalculation procedures (NDT method 1); and (3) NDT method 2 appears to work well for low-volume roads and should be tested on high-volume roads.
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