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The effect of instrumentation on the determination of the resilient modulus of unbound granular materials using advanced repeated load triaxial testing

journal contribution
posted on 2023-05-19, 22:51 authored by Zhalehjoo, N, Ali TolooiyanAli Tolooiyan, Mackay, R, Bodin, D
Unbound Granular Materials (UGMs) are used in the base/subbase layers of flexible pavement structures for the vast majority of the main roads around the world. The resilient modulus of UGMs is a key input parameter for the design and analysis of flexible pavement structures. In the present study, four road base UGMs with a range of moisture contents are used to evaluate each material’s resilient deformation behaviour using laboratory repeated load triaxial tests. The triaxial system for the tests is instrumented with four axial deformation gauges: an on-specimen axial Hall-Effect transducer, an internal Linear Variable Differential Transformer (LVDT), an external LVDT, and the actuator LVDT. The application of a Hall-Effect transducer directly mounted on the specimen and the three LVDTs permits the comparative study of alternative deformation measurements for the determination of an accurate and reliable resilient modulus value. By comparing tests results obtained with each transducer, the relative capability of each measurement is determined and a reference transducer for deformation measurement is identified. A constitutive model is then used to carry out a regression analysis and to predict the resilient modulus of the four tested materials.

History

Publication title

Transportation Geotechnics

Volume

14

Pagination

190-201

ISSN

2214-3912

Department/School

School of Engineering

Publisher

Elsevier Science Bv

Place of publication

Netherlands

Rights statement

Copyright 2018 Elsevier Ltd.

Repository Status

  • Restricted

Socio-economic Objectives

Soils; Expanding knowledge in engineering

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