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Federal Highway Administration Research and Technology
Coordinating, Developing, and Delivering Highway Transportation Innovations
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Publication Number: FHWA-HRT-05-152
Date: February 2006
Guidelines for Review and Evaluation of Backcalculation Results
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This report documents a new approach, called forward calculation, used for determining layered elastic moduli from in situ load-deflection data. Guidelines are provided for carrying out forward calculation procedures as well as screening Backcalculation results using forward calculated moduli.
This report will be of interest to highway agency engineers involved in pavement analysis, design, construction, and deflection data collection, as well as researchers who will use the Long-Term Pavement Performance (LTPP) load-deflection data to improve design procedures and standards for constructing and rehabilitating pavements.
Gary L. Henderson
This document is disseminated under the sponsorship of the U.S. Department of Transportation in the interest of information exchange. The U.S. Government assumes no liability for the use of the information contained in this document. This report does not constitute a standard, specification, or regulation.
The U.S. Government does not endorse products or manufacturers. Trademarks or manufacturers' names appear in this report only because they are considered essential to the objective of the document.
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The Federal Highway Administration (FHWA) provides high-quality information to serve Government, industry, and the public in a manner that promotes public understanding. Standards and policies are used to ensure and maximize the quality, objectivity, utility, and integrity of its information. FHWA periodically reviews quality issues and adjusts its programs and processes to ensure continuous quality improvement.
Technical Report Documentation Page
Form DOT F 1700.7 (8-72) Reproduction of completed page authorized
List of Figures
List of Tables
Topics: research, infrastructure, pavements and materials
Keywords: research, infrastructure, pavements and materials,Pavements, LTPP, FWD, deflection data, elastic modulus, Backcalculation, forward calculation, screening of pavement moduli.
TRT Terms: research, facilities, transportation, highway facilities, roads, parts of roads, pavements