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
February 1995
4. TITLE AND SUBTITLE
5. FUNDING NUMBERS
Assessing Cryogenic Testing of Aggregate for
Concrete Pavements
6. AUTHORS
Charles Korhonen and Brian Charest
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 95-4
Hanover, New Hampshire 03755-1290
9. SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES)
10. SPONSORING/MONITORING
AGENCY REPORT NUMBER
Office of the Chief of Engineers
Washington, D.C. 20314-1000
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)
Damage to concrete pavements caused by freezethaw deterioration of concrete aggregate remains a serious
problem. Current tests for determining an aggregate's freezethaw durability can take up to 70 days to perform
and results from these tests don't always correlate well with field performance. A rapid test for freezethaw
durability that would accurately predict field service would be a valuable tool for providing durable concrete.
Cycling aggregate 10 times between liquid nitrogen and hot water proved useful as a tool to rule out frost-
susceptible aggregate. Pore size distribution measurements reveal pore sizes that are critical to freezethaw
durability. Aggregates with more than 75% of their measurable pore volume between pore diameters of 0.01
and 5 m or with more than 95% of their measurable pore volume smaller than 5 m were susceptible to frost
damage. Thus a new freezethaw test for aggregates might employ the cryogenic test to screen out all frost-
susceptible aggregate and pore size measurement classify the rest. This new test procedure offers results much
sooner than current standard test procedures. Further study is needed to refine this method for general use.
14. SUBJECT TERMS
15. NUMBER OF PAGES
18
Cold weather construction Cryogenic tests Freezethaw
16. PRICE CODE
Concrete
Durability
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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