Evaluation of NCHRP 747 Pavement Forensic Guide for GDOT’s Adoption
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2018-04-01
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NTL Classification:NTL-HIGHWAY/ROAD TRANSPORTATION-Pavement Management and Performance;NTL-HIGHWAY/ROAD TRANSPORTATION-Soils and Geology;
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Abstract:This report presents the recommendation for whether the Georgia Department of Transportation (GDOT) should adopt the National Cooperative Highway Research Program (NCHRP) Report 747 (Guide for Conducting Forensic Investigations of Highway Pavements) as a guide to conduct forensic investigations in Georgia. This report documents the evaluation of three pavement types using the NCHRP 747 guide: Jointed Plain Concrete (JPC), Continuously Reinforced Concrete (CRC), and Hot Mix Asphalt (HMA). Each pavement type consisted of an evaluation of two sites, one in “good/fair” condition and the other in “poor” condition. Non-destructive testing was performed using Ground Penetration Radar (GPR) and Falling Weight Deflectometer (FWD). Destructive testing (coring) and on-site field testing was performed consistent with the recommendations of the forensic guide. Laboratory tests were conducted to determine material properties of the existing pavement. These results were combined with traffic data and weather information to form conclusions about the cause(s) of pavement distress in sections of “poor” condition. Based on the successful investigations, it is recommended to adopt the NCHRP Report 747 for use in Georgia.
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