Form Approved
REPORT DOCUMENTATION PAGE
OMB No. 0704-0188
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data needed, and completing and reviewing this collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing
this burden to Department of Defense, Washington Headquarters Services, Directorate for Information Operations and Reports (0704-0188), 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302.
Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to any penalty for failing to comply with a collection of information if it does not display a currently valid
OMB control number. PLEASE DO NOT RETURN YOUR FORM TO THE ABOVE ADDRESS.
1. REPORT DATE (DD-MM-YY)
2. REPORT TYPE
3. DATES COVERED (From - To)
September 2001
Technical Report
4. TITLE AND SUBTITLE
5a. CONTRACT NUMBER
5b. GRANT NUMBER
The Effect of Aggregate Angularity on Base Course Performance
5c. PROGRAM ELEMENT NUMBER
6. AUTHOR(S)
5d. PROJECT NUMBER
5e. TASK NUMBER
Vincent C. Janoo and John J. Bayer II
5f. WORK UNIT NUMBER
7. PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES)
8. PERFORMING ORGANIZATION REPORT
NUMBER
U.S. Army Engineer Research and Development Center
Cold Regions Research and Engineering Laboratory
72 Lyme Road
ERDC/CRREL TR-01-14
Hanover, New Hampshire 03755-1290
9. SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES)
10. SPONSOR / MONITOR'S ACRONYM(S)
Vermont Agency of Transportation
11. SPONSOR / MONITOR'S REPORT
National Life Building, Drawer 33
NUMBER(S)
Montpelier, VT 05633-5001
12. DISTRIBUTION / AVAILABILITY STATEMENT
Approved for public release; distribution is unlimited.
Available from NTIS, Springfield, Virginia 22161.
13. SUPPLEMENTARY NOTES
14. ABSTRACT
The Vermont Agency of Transportation (VAOT) conducted a two-phase study to quantify the resilient modulus and strength character-
istics of its subbase material. In Phase 1, a literature review was done to determine the various methods available for indexing the
shape, texture, and angularity of coarse aggregates. In the second phase, described in this report, a study was conducted to relate
particle index to the mechanical resilient and shear properties of base course materials. The particle index as modified by the Michigan
Department of Transportation used the complete gradation and was a good indicator of the crushed (angular) content of a given base
course gradation. The particle index test also may be used to indicate resilient and shear properties of base course aggregate gradation.
15. SUBJECT TERMS
Shear properties
Aggregates
Base
Particle index
Angularity
Large-scale samples Resilient modulus
Subbase
16. SECURITY CLASSIFICATION OF:
17. LIMITATION OF
18. NUMBER
19a. NAME OF RESPONSIBLE PERSON
OF ABSTRACT
OF PAGES
a. REPORT
b. ABSTRACT
c. THIS PAGE
19b. TELEPHONE NUMBER (include area code)
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35
Standard Form 298 (Rev. 8-98)
Prescribed by ANSI Std. 239.18
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