Form Approved
REPORT DOCUMENTATION PAGE
OMB No. 0704-0188
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1. AGENCY USE ONLY (Leave blank)
2. REPORT DATE
3. REPORT TYPE AND DATES COVERED
November 1997
4. TITLE AND SUBTITLE
5. FUNDING NUMBERS
Time-Domain Reflectometry of
Water Content in Portland Cement Concrete
6. AUTHORS
Charles J. Korhonen, Vincent C. Janoo, and Christopher M. Berini
7. PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES)
8. PERFORMING ORGANIZATION
REPORT NUMBER
U.S. Army Cold Regions Research and Engineering Laboratory
72 Lyme Road
Hanover, New Hampshire 03755-1290
Special Report 97-27
9. SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES)
10. SPONSORING/MONITORING
U.S. Department of Transportation
AGENCY REPORT NUMBER
Federal Aviation Administration
Office of Aviation Research
Washington, D.C. 20591
DOT/FAA/AR-97/10
For conversion of SI units to non-SI units of measurement consult Standard Practice for Use of the
11. SUPPLEMENTARY NOTES
International System of Units (SI), ASTM Standard E380-93, published by the American Society for Testing and Materials,
1916 Race St., Philadelphia, Pa. 19103.
12a. DISTRIBUTION/AVAILABILITY STATEMENT
12b. DISTRIBUTION CODE
Approved for public release; distribution is unlimited.
Available from NTIS, Springfield, Virginia 22161.
13. ABSTRACT (Maximum 200 words)
Time-domain reflectometry is useful for measuring the moisture content of solids. However, little information
exists on its use with portland cement concrete. By monitoring the response from TDR sensors embedded in
concrete as the concrete dried, we developed a second-order polynomial equation that relates dielectric con-
stant to moisture content. The study is valid for the specific concrete studied.
14. SUBJECT TERMS
15. NUMBER OF PAGES
Dielectric constant
Portland cement concrete
19
Moisture constant
Time-domain reflectometry
16. PRICE CODE
17. SECURITY CLASSIFICATION
18. SECURITY CLASSIFICATION
19. SECURITY CLASSIFICATION
20. LIMITATION OF ABSTRACT
OF REPORT
OF THIS PAGE
OF ABSTRACT
UNCLASSIFIED
UNCLASSIFIED
UNCLASSIFIED
UL
Standard Form 298 (Rev. 2-89)
Prescribed by ANSI Std. Z39-18
298-102