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Title:

EFFECT OF CHANGES IN GRADATION ON STRENGTH AND UNIT WEIGHT OF CRUSHED STONE BASE

Accession Number:

00230164

Record Type:

Component

Abstract:

THE TEST PERFORMED INCLUDED COMPACTED UNIT WEIGHT, CBR, AND TRIAXIAL SHEAR TESTS. THE RESULTS OF THE TESTS INDICATE THAT CRUSHED GRANITE WITH A GRADATION INSIDE THE ASTM SPECIFICATION BAND INCLUDED IN THE NEW ASTM SPECIFICATION D 2940 71T, GRADED AGGREGATE MATERIAL FOR BASES OR SUBBASES FOR HIGHWAY OR AIRPORTS, PRODUCES SATISFACTORY SHEAR STRENGTHS. THE SHEAR STRENGTH VARIATION FOR GRADATIONS WITHIN THE SPECIFICATION BAND WAS SMALL. THE HIGHEST SHEAR STRENGTH WAS OBTAINED ON SPECIMENS CONFORMING TO AN ASTM DOWN-THE-MIDDLE GRADATION. THE RESULTS TENDED TO SHOW THAT INCREASING THE PERCENTAGE OF MATERIAL PASSING THE NO. 200 SIEVE CAUSES A DECREASE IN SHEAR STRENGTH. THE DATA APPEAR TO CONFIRM THE NEED TO LIMIT THE PERCENTAGE PASSING THE NO. 200 SIEVE TO LESS THAN 10 PERCENT AND THE PERCENTAGE PASSING THE NO. 4 SIEVE TO LESS THAN APPROXIMATELY 50 PERCENT FOR A 2-IN. TOPSIZED AGGREGATE. TEST RESULTS SHOWED THAT THE SHEAR STRENGTH, AS DETERMINED BY THE CALIFORNIA BEARING RATIO TEST, WAS INCREASED BY A FACTOR OF SLIGHTLY LESS THAN 2 WHEN THE COMPACTIVE EFFORT WAS INCREASED FROM AASHO T 99 TO AASHO T 180. /AUTHOR/

Supplemental Notes:

Sponsored by Committee on Strength and Deformation Characteristics of Pavement Sections. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved

Monograph Accession #:

00044066

Corporate Authors:

Highway Research Board

2101 Constitution Avenue, NW
Washington, DC 20418

Authors:

Jones Jr, Truman R
Otten, Edwin L
Machemehl Jr, Charles A
Carlton, T A

Pagination:

pp 19-23

Publication Date:

1972

Serial:

Highway Research Record

Issue Number: 405
Publisher: Highway Research Board

Conference:

41st Annual Meeting of the Highway Research Board

Location: Washington DC, United States
Date: 1962-1-8 to 1962-1-12
Sponsors: National Research Council

Media Type:

Print

Features:

Figures (4) ; References (6) ; Tables (1)

Uncontrolled Terms:

Particle size distribution

Old TRIS Terms:

Subject Areas:

Geotechnology; Highways; Materials

Files:

TRIS, TRB

Created Date:

Apr 17 1973 12:00AM

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