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

Lintao, Yang and Marshall, Alec M. and Wanatowski, Dariusz and Stace, Rod and Ekneligoda, Thushan (2017) Effect of high temperatures on sandstone: a computed tomography scan study. International Journal of Physical Modelling in Geotechnics, 17 (2). pp. 75-90. ISSN 2042-6550

[img]
Preview
PDF - Requires a PDF viewer such as GSview, Xpdf or Adobe Acrobat Reader
Download (2MB) | Preview

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.

Item Type: Article
Keywords: Rocks, Rock mechanics, Thermal effects
Schools/Departments: University of Nottingham, UK > Faculty of Engineering > Department of Civil Engineering
Identification Number: 10.1680/jphmg.15.00031
Depositing User: Eprints, Support
Date Deposited: 25 Jan 2017 13:09
Last Modified: 14 Oct 2017 09:21
URI: http://eprints.nottingham.ac.uk/id/eprint/40072

Actions (Archive Staff Only)

Edit View Edit View