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Title: ACCURACY IMPROVEMENT OF EXTERNAL RESILIENT MODULUS MEASUREMENTS USING SPECIMEN GROUTING TO END PLATENS
Accession Number: 00677580
Record Type: Component
Availability: Find a library where document is available Abstract: To eliminate the source of errors in deformational measurements at small to intermediate strains (0.01% to 1.0%), a local strain measurement system inside the triaxial cell has been adopted in the resilient modulus (M sub R) test. However, because of complexities inherent in the local measurement, there are difficulties in using this technique in routine tests. As an alternative solution, external M sub R measurement with the specimen grouted to the end platens with hydrostone paste was used. The effects of specimen grouting and the stiffness range on reliable external M sub R measurements were investigated using six synthetic specimens of known stiffnesses ranging from that approximating a soft subgrade to that approximating stiff base material [from 20.7 MPa (3 ksi) to 552 MPa (80 ksi)]. For stiffness below about 345 MPa (50,000 psi), M sub R values determined by external measurements with grouted specimens are identical to the known values from torsional testing. However, for the stiffer specimens, M sub R values of the grouted specimens are less than those from torsional testing, and the deviation increases with the increasing stiffness of the specimen. The secant static moduli determined by both loading and unloading curves closely matched the cyclic M sub R at the same strain rate (or loading frequency), proving the feasibility of using the static testing scheme instead of the more expensive cyclic test. Finally, the effects of specimen grouting were investigated using compacted subgrade soils.
Supplemental Notes: This paper appears in Transportation Research Record No. 1462, Compaction of Difficult Soils and Resilient Modulus Testing. 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: Monograph Accession #: 01495760
Language: English
Authors: Kim, Dong-SooDrabkin, SergeyPagination: p. 65-71
Publication Date: 1994
Serial: ISBN: 0309060680
Features: Figures
(9)
; References
(12)
; Tables
(3)
TRT Terms: Old TRIS Terms: Subject Areas: Geotechnology; Highways; I42: Soil Mechanics
Files: TRIS, TRB
Created Date: May 3 1995 12:00AM
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