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Title:

SIMPLIFICATION OF SUBGRADE RESILIENT MODULUS TESTING

Accession Number:

00489531

Record Type:

Component

Availability:

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Order URL: http://worldcat.org/isbn/0309047706

Abstract:

The standard test method (AASHTO T274) for the resilient modulus of cohesive soils can be simplified without affecting the reliability of flexible pavement design by the AASHTO Guide. The traffic life prediction accuracy (standard deviation) of the AASHTO design equation is equivalent to a resilient modulus testing accuracy of about 30 percent. The overall prediction accuracy is not affected substantially as long as the testing error (standard deviation) is 15 percent or less. Three cohesive soils were tested to examine the effects of confining pressure, deviator stress, number of stress cycles, and compaction method. For routine design the standard method of test can be simplified by (1) reducing the number of confining pressures from three to one (3 psi is suggested); (2) reducing the number of deviator stress levels from five to one (8 psi is suggested); and (3) reducing the number of stress cycles from 200 to 50. With these test simplification measures, the time required for testing (excluding sample preparation and test setup) is reduced from 100 minutes per specimen to less than 2 minutes.

Supplemental Notes:

This paper appears in Transportation Research Record No. 1192, Soil Engineering. 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 Title:

Soil engineering

Monograph Accession #:

01413981

Authors:

Elliott, Robert P
Thornton, Sam I

Pagination:

p. 1-7

Publication Date:

1988

Serial:

Transportation Research Record

Issue Number: 1192
Publisher: Transportation Research Board
ISSN: 0361-1981

ISBN:

0309047706

Features:

Figures (10) ; References (6) ; Tables (2)

Old TRIS Terms:

Subject Areas:

Geotechnology; Highways; I42: Soil Mechanics

Files:

TRIS, TRB, ATRI

Created Date:

Nov 30 1989 12:00AM

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