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Title:

ALTERNATIVE METHOD OF DETERMINING RESILIENT MODULUS OF COMPACTED SUBGRADE SOILS USING FREE-FREE RESONANT COLUMN TEST

Accession Number:

00741963

Record Type:

Component

Availability:

Find a library where document is available


Order URL: http://worldcat.org/isbn/0309061598

Abstract:

An alternative procedure of determining the resilient modulus (M sub R) of compacted subgrade soils using a free-free resonant column (FF-RC) test is proposed. The FF-RC test was used to determine a small-strain Young's modulus (E sub max) and Poisson's ratio on the basis of the elastic wave propagation theory. Resonant column (RC) and torsional shear (TS) tests were performed to investigate the effects of loading frequency and strain amplitude on the resilient modulus of subgrade soils. By performing FF-RC, RC/TS, and M sub R tests on the synthetic specimens of known stiffnesses, the feasibility of using the FF-RC test to measure the M sub R was evaluated and the M sub R testing equipment was calibrated. Moduli of subgrade soils determined by FF-RC tests match well with values obtained from RC and TS tests at small strains, indicating that the FF-RC test can provide a reliable estimation of E sub max, if the effects of loading frequency are considered. In the proposed method, E sub max obtained from the FF-RC test can be combined with the effect of loading frequency and the modulus reduction curve determined by the data base of the RC and TS tests for the compacted subgrade soils of various plasticity indexes. Moduli obtained from the proposed method overlapped nicely with M sub R values determined by standard M sub R testing, showing the capability of the proposed method being used in determining M sub R values, provided that the effects of loading frequency and modulus reduction curve are considered.

Supplemental Notes:

This paper appears in Transportation Research Record No. 1577, Pavement Base and Foundation Materials, Deformation Characteristics of Subgrade, and Properties of Unconventional Aggregates.

Language:

English

Corporate Authors:

Transportation Research Board

500 Fifth Street, NW
Washington, DC 20001 United States

Authors:

KIM, D-S
Kweon, G-C
Lee, K-H

Pagination:

p. 62-69

Publication Date:

1997

Serial:

Transportation Research Record

Issue Number: 1577
Publisher: Transportation Research Board
ISSN: 0361-1981

ISBN:

0309061598

Features:

Figures (10) ; References (9) ; Tables (3)

Uncontrolled Terms:

Loading frequency

Old TRIS Terms:

Subject Areas:

Geotechnology; Highways; I42: Soil Mechanics

Files:

TRIS, TRB, ATRI

Created Date:

Oct 20 1997 12:00AM

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