Form Approved
REPORT DOCUMENTATION PAGE
OMB No. 0704-0188
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VA 22202-4302, and to the Office of Management and Budget, Paperwork Reduction Project (0704-0188), Washington, DC 20503.
1. AGENCY USE ONLY (Leave blank)
2. REPORT DATE
3. REPORT TYPE AND DATES COVERED
November 1997
4. TITLE AND SUBTITLE
5. FUNDING NUMBERS
Current and Proposed Practices for Nondestructive Highway
Pavement Testing
PR: 4A762784AT42
6. AUTHORS
WP: 225
Maureen A. Kestler
WU: CP-S01
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
Special Report 97-28
Hanover, New Hampshire 03755-1290
9. SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES)
10. SPONSORING/MONITORING
AGENCY REPORT NUMBER
U.S. Army Cold Regions Research and Engineering Laboratory
72 Lyme Road
Hanover, New Hampshire 03755-1290
11. SUPPLEMENTARY NOTES
For conversion of SI units to non-SI units of measurement, consult ASTM Standard E380-93, Standard Practice for Use of the
International System of Units, 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)
In September 1994 the U.S. Army Cold Regions Research and Engineering Laboratory (CRREL) distributed a
short survey on nondestructive testing practices to each of the 50 state Departments of Transportation (DOTs).
The compilation of results constituted Phase I of a multiphase effort intended to lead toward the development
of a method for optimizing falling weight deflectometer (FWD) test point spacing. Planned spatial statistical
analyses on selected data sets will yield (site-specific) optimal FWD test point spacing for road network
evaluation and pavement overlay design. Optimal FWD test point spacing reduces conservative overdesign
due to undertesting and reduces overtesting. Both of these ultimately reduce expenditures. Although the above
effort has not been completed, this interim report outlines the proposed process. Also included (and perhaps of
more immediate interest to state DOTs) are direct survey facts and figures, including number of states with
nondestructive testing (NDT) devices, average number of miles of annual overlay design, average number of
miles of network/inventory testing, and back-calculation programs and overlay design procedures used. All
facts and figures are generic and honor state anonymity.
14. SUBJECT TERMS
15. NUMBER OF PAGES
13
Back calculation, Falling weight deflectometer, FWD, NDT, Nondestructive testing,
Pavement deflection analysis, Pavement evaluation, Pavement overlay design, Spatial
16. PRICE CODE
variability
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)
NSN 7540-01-280-5500
Prescribed by ANSI Std. Z39-18
298-102
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