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
May 1996
4. TITLE AND SUBTITLE
5. FUNDING NUMBERS
PCC Airfield Pavement Response During Thaw-Weakening Periods:
PR: 4A762784AT42
A Field Study
MA: BS
WU: BS/036
6. AUTHORS
Vincent C. Janoo and Richard L. Berg
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 96-12
Hanover, New Hampshire 03755-1290
9. SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES)
10. SPONSORING/MONITORING
AGENCY REPORT NUMBER
Federal Aviation Administration
and
Office of the Chief of Engineers
Technical Center
Washington, D.C. 20314-1000
Atlantic City International Airport
New Jersey 08405
11. SUPPLEMENTARY NOTES
For conversion of SI units to non-SI units of measurement consult Standard Practice for Use of the 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)
This investigation is part of CRREL's on-going characterization of pavement performance in seasonal frost areas. As part
of the research, CRREL conducted several field studies for the Federal Aviation Administration (FAA) on the response of
airport pavements during thaw-weakening periods at three civil airports in Wisconsin where the design freezing index in
the area was around 900 to 1100C-days and frost penetration ranged between 1250 and 2000 mm. This study focused on
the performance of Portland Cement Concrete (PCC) pavements during the spring thaw-weakening period. The sites were
instrumented with subsurface thermocouples and Falling Weight Deflectometer (FWD) tests were conducted during the
spring thaw period at the center of the slab and across the joints. An analysis of the FWD data and backcalculation of the
layer moduli using ILLIBACK and WESDEF was conducted. Unique relationships between the FWD deflections and the
subgrade modulus and coefficient of subgrade reaction were obtained. Additional relationships were developed using the
FWD deflections, PCC thickness and the horizontal tensile stress at the bottom of the PCC layer. A relationship between
load transfer across joints and FWD deflections was also developed. On the basis of the relationships obtained in this
study, a methodology for evaluating PCC pavements during spring thaw was developed. However, this methodology
needs to be verified for other subgrade types and areas with other design freezing indices.
14. SUBJECT TERMS
15. NUMBER OF PAGES
44
Evaluation
Pavement
Thaw-weakening
16. PRICE CODE
Load transfer
PCC pavements
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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