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Title: METHODOLOGY FOR RESILIENT MODULUS TESTING OF COHESIONLESS SUBGRADES
Accession Number: 00641443
Record Type: Component
Availability: Find a library where document is available Abstract: Because more emphasis is being placed on incorporating resilient modulus testing in mechanistic pavement design, a reliable method for conducting the tests should be developed. The strengths and limitations of the resilient modulus testing procedure as applied to cohesionless subgrade soils are detailed in this paper. The overall objectives of this paper are to evaluate the accuracy of the resilient modulus test procedures, to modify the existing resilient modulus testing procedures as applied to granular materials, and to develop a more rigorous constitutive model for describing the results from resilient modulus tests. With a careful literature search in the areas of dynamic testing of soils as applied to transportation engineering, geotechnical engineering, and earthquake engineering, one can obtain a list of parameters that influence the results of cyclic tests (such as the resilient modulus tests). The compliance of the testing device, specimen preparation, level of deviatoric stress, and the sequence and number of loading schemes are the major parameters. Through extensive testing of synthetic specimens using state-of-the-art equipment, the accuracy, precision, and limitations of the procedure have been established. It was found that (a) a rigid system was required to minimize the compliance effects; (b) below a deviatoric stress of 2 psi, the results were questionable, and (c) the sequence of loading proposed by the AASHTO T-274 should be extensively modified. It was also found that the Strategic Highway Research Program protocol suggested for granular materials may result in excessive specimen disturbance. A newly developed procedure has been recommended herein. Given the level of emphasis in improving the resilient modulus testing procedure, it is reasonable to expect more advanced constitutive models representing the collected data. A new constitutive model was evaluated. The proposed model appears to be theoretically more accurate and describes the data more clearly.
Supplemental Notes: This paper appears in Transportation Research Record No. 1406, Construction Robotics and Automation, and Foundations 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: Construction robotics and automation, and foundations engineering Monograph Accession #: 01403255
Language: English
Authors: Nazarian, SoheilFeliberti, ManuelPagination: p. 108-115
Publication Date: 1993
Serial: ISBN: 0309055539
Features: Figures
(7)
; References
(8)
; Tables
(4)
TRT Terms: Uncontrolled Terms: Subject Areas: Design; Geotechnology; Highways; Pavements; I22: Design of Pavements, Railways and Guideways; I42: Soil Mechanics
Files: TRIS, TRB, ATRI
Created Date: Jan 25 1994 12:00AM
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