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
January 1998
4. TITLE AND SUBTITLE
5. FUNDING NUMBERS
Quantification of Shape, Angularity, and Surface Texture
of Base Course Materials
6. AUTHORS
Vincent Janoo
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 98-1
Hanover, New Hampshire 03755-1290
9. SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES)
10. SPONSORING/MONITORING
AGENCY REPORT NUMBER
State of Vermont Agency of Transportation
133 State Street
Montpelier, Vermont 05602
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)
A state-of-the-art review was conducted to determine existing test methods for characterizing the shape, angular-
ity, and surface texture of coarse aggregates. The review found direct methods used by geologists to determine
these characteristics. These methods involve physical measurements of individual aggregates and are very labori-
ous and time consuming. Engineers have developed index tests (indirect methods) to quantify the combined
effect of the shape, angularity, and surface texture of coarse aggregates in terms of changes in the voids in the
aggregate bulk. A description of both the direct and indirect methods is provided in the report. Also, the effect of
shape, angularity, and surface texture of coarse aggregates on the base course performance was reviewed. It was
found that there is some contradiction in the published data on resilient modulus. Shape, angularity, and surface
texture of coarse aggregates clearly influence the angle of internal friction.
14. SUBJECT TERMS
15. NUMBER OF PAGES
28
Angularity
Roughness
Coarse aggregates
Shape
16. PRICE CODE
Resilient modulus
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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