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This paper provides a brief history of the efforts of ASTM Subcommittees D18.10 and D04.39 in working toward a standard guideline for the backcalculation of Nondestructive Testing Deflection data. For nearly six years, this document has been under development and seven drafts have been balloted at the subcommittee level. Currently, this process has been temporarily tabled until after the symposium; because, it is felt by many that this technology is still evolving. The main emphasis of this work is to record the latest version of the draft standard which represents the combined input of the people working on these subcommittees. It is hoped that this paper will elicit comments from the many engineers working in this area so that their constructive criticism can improve upon this guideline and allow it to move forward in the ASTM balloting process.
backcalculation, nondestructive testing, flexible pavements, moduli, deflections, layered elastic, pavement evaluation, standard guide
Senior Engineer, Asphalt Institute, Lexington, KY
Von Quintus, HL
President, Brent Rauhut Engineering, Inc., Austin, TX