U.S. Department of Transportation
Federal Highway Administration
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Federal Highway Administration Research and Technology
Coordinating, Developing, and Delivering Highway Transportation Innovations
|This report is an archived publication and may contain dated technical, contact, and link information|
|Publication Number: FHWA-RD-99-115 Date: September 1999|
Publication Number: FHWA-RD-99-115
Date: September 1999
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As a part of the Long Term Pavement Perrorrnance (LTPP) Seasonal Monitoring Program, Time Domain Reflectometry (TDR) technology has been used to monitor in situ moisture conditions at selected LTPP test sites. The raw TDR wave form data have been available in the LTPP database for some time. However, to be useful in engineering analyses, the raw data must be interpreted to derive estimates of the in situ moisture content. This report documents analysis conducted to develop and apply procedures for interpretation ofthe raw LTPP TDR data. The "computed parameters" - volumetric and gravimetric moisture contents and related parameters - derived through this analysis have been added to the LTIP database.
This report will be of interest to those who wish to use the LTPP seasonaI monitoring dsta, and to other users (or potential users) of TDR technology for in situ moisture monitoring.
T. Paul Teng, Director
Office of Structure, Research and Development
This document is disseminated under the sponsorship of the Department of Transportation in the interest of information exchange. The United States Government assumes no liability for its contents or use thereof. This report does not constitute a standard, specification, or regulation.
The United States Government does not endorse products or manufacturers. Trade and manufacturers' names appear in this report only because they are considered essential to the object of the document.