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Effect of high temperatures on sandstone: a computed tomography scan study

Lintao, Yang; Marshall, Alec M.; Wanatowski, Dariusz; Stace, Rod; Ekneligoda, Thushan

Authors

Yang Lintao

Dariusz Wanatowski

Rod Stace

Thushan Ekneligoda



Abstract

The impact of high temperatures on rocks is a topic of growing importance in geotechnical engineering due to its relevance to applications such as underground nuclear fuel storage, geothermal energy resource exploration and underground coal gasification. This paper presents results from tests performed on samples of sandstone treated to a range of temperatures between 20 and 1000°C. Sandstone samples obtained from underground coal gasification trial sites in Poland were selected for the tests. Multistage triaxial tests were used to determine the mechanical properties of the samples. X-ray diffraction and thermal analyses were performed to investigate the changes in physical and chemical properties of the samples under increasing temperature. Micro-computed tomography analyses were carried out on selected samples in order to show the microstructural changes that take place as a result of the heating process. Three-dimensional characterisation of sample porosity and pore-size distribution was performed to obtain a quantitative comparison between samples subjected to different temperature treatments. The relationship between microstructure and macro-mechanical characteristics of sandstone at high temperatures is discussed. The results illustrate that the mechanical properties of sandstone are closely related to alterations of microstructure that result from increased temperatures.

Journal Article Type Article
Publication Date 2017-06
Journal International Journal of Physical Modelling in Geotechnics
Print ISSN 1346-213X
Electronic ISSN 2042-6550
Publisher Thomas Telford
Peer Reviewed Peer Reviewed
Volume 17
Issue 2
Pages 75-90
APA6 Citation Lintao, Y., Marshall, A. M., Wanatowski, D., Stace, R., & Ekneligoda, T. (2017). Effect of high temperatures on sandstone: a computed tomography scan study. International Journal of Physical Modelling in Geotechnics, 17(2), 75-90. https://doi.org/10.1680/jphmg.15.00031
DOI https://doi.org/10.1680/jphmg.15.00031
Keywords Rocks, Rock mechanics, Thermal effects
Publisher URL http://www.icevirtuallibrary.com/doi/10.1680/jphmg.15.00031
Copyright Statement Copyright information regarding this work can be found at the following address: http://eprints.nottingh.../end_user_agreement.pdf

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://eprints.nottingham.ac.uk/end_user_agreement.pdf



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