A CRS oedometer cell for unsaturated and non-isothermal tests

Meghdad Bagheri, Mohaddeseh Mousavi Nezhad, Mohammad Rezania

Research output: Contribution to journalArticle

Abstract

Research into the thermo-hydro-mechanical (THM) behavior of unsaturated soils and the effect of strain rate on their mechanical responses requires employment of advanced laboratory testing systems and procedures as well as protocols of correcting the measured data in order to account for errors associated with complex test conditions and apparatus calibrations. This paper presents design and calibration of an innovative constant-rate-of-strain (CRS) oedometer cell for characterization of the THM behavior of soils under combined non-isothermal and unsaturated conditions. The advanced oedometer cell enables for simultaneous control of temperature, suction, and stress state within the soil specimens. Temperatures of 20 to 200° C is applied through a tubular heating element placed at the base of the soil specimen. Suction is controlled using axis-translation technique, and measured using both axis-translation and two high-capacity tensiometers (HCTs) accommodated on the periphery of the specimen. The performance of the new cell is assessed based on a set of tests performed on clay specimens and its merits and advantages are discussed in detail.
Original languageEnglish
Article numberGTJ20180204
Number of pages18
JournalGeotechnical Testing Journal
Volume43
Issue number1
Early online date21 Feb 2019
DOIs
Publication statusPublished - 2019

Fingerprint

Soils
suction
soil
Calibration
calibration
Electric heating elements
tensiometer
strain rate
Strain rate
Clay
temperature
heating
clay
Temperature
rate
test
Testing
protocol
laboratory
effect

Bibliographical note

Copyright © and Moral Rights are retained by the author(s) and/ or other copyright owners. A copy can be downloaded for personal non-commercial research or study, without prior permission or charge. This item cannot be reproduced or quoted extensively from without first obtaining permission in writing from the copyright holder(s). The content must not be changed in any way or sold commercially in any format or medium without the formal permission of the copyright holders.

Keywords

  • oedometer
  • strain rate
  • temperature
  • suction
  • tensiometer
  • water retention
  • Calibration

Cite this

A CRS oedometer cell for unsaturated and non-isothermal tests. / Bagheri, Meghdad; Mousavi Nezhad, Mohaddeseh; Rezania, Mohammad.

In: Geotechnical Testing Journal, Vol. 43, No. 1, GTJ20180204, 2019.

Research output: Contribution to journalArticle

Bagheri, Meghdad ; Mousavi Nezhad, Mohaddeseh ; Rezania, Mohammad. / A CRS oedometer cell for unsaturated and non-isothermal tests. In: Geotechnical Testing Journal. 2019 ; Vol. 43, No. 1.
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