Evaluation of a Nuclear Asphalt Content Gage: Final Report

Report No: 70-R26

Published in 1970

About the report:

The Troxler Model 2226 asphalt content gauge was evaluated in the laboratory and taken into the field where its results were compared to conventional reflux values. The precision as evaluated in the laboratory was found to be excellent - equivalent to .06% asphalt content with a 45 second count. The gauge does have to be recalibrated each time a different aggregate is used and as a practical matter should be recalibrated for each different mix type. Sample preparation is important, and samples should be as uniform as possible. The accuracy appears to be as good as that of the reflux extractor. A recommendation for using the nuclear gauge is appended.

Disclaimer Statement:The contents of this report reflect the views of the author(s), who is responsible for the facts and the accuracy of the data presented herein. The contents do not necessarily reflect the official views or policies of the Virginia Department of Transportation, the Commonwealth Transportation Board, or the Federal Highway Administration. This report does not constitute a standard, specification, or regulation. Any inclusion of manufacturer names, trade names, or trademarks is for identification purposes only and is not to be considered an endorsement.


  • Charles S. Hughes, P.E.

Last updated: February 12, 2024

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