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Advances in Materials Science and Engineering
Volume 2017, Article ID 4219025, 12 pages
https://doi.org/10.1155/2017/4219025
Research Article

An Experimental Evaluation of the Weathering Effects on Mine Shaft Lining Materials

1Key Laboratory of Transportation Tunnel Engineering, Ministry of Education, First North Section 111, Erhuan Road, Chengdu 610031, China
2University of Nottingham, University Park, Nottingham NG7 2RD, UK
3Southwest Jiaotong University-Leeds Joint School, Xipu Campus, Chengdu 611756, China

Correspondence should be addressed to W. Yang; moc.liamtoh@9711obnewgnay

Received 10 August 2016; Accepted 1 December 2016; Published 3 January 2017

Academic Editor: Luigi Nicolais

Copyright © 2017 W. Yang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Many shaft collapses are related to the deterioration and failure of the masonry shaft lining materials. In modern mine shaft, concrete is widely used to provide support. To analyse shafts stability, the properties of the lining need to be well defined. The behaviour of masonry and concrete can be considerably affected by long-term exposure to harsh mine water. This paper presents a study which focuses on the weathering effects of mine water on lining materials (brick, mortar, and concrete). To reproduce the weathering process, samples were placed into solutions of potable water, artificial mine water, and a more aggressive mine-water solution for just less than one year. Four phases of laboratory tests were conducted throughout the time period to assess the degradation of mechanical properties of the lining materials. Particular attention is given to the degradation of material strength and stiffness. Results indicate that the harsh acidic mine water has pronounced detrimental effects on the strength and stiffness of mortar. The weathering process is shown to have the most significant effect on the stiffness of concrete and mortar. It is also shown that the use of mass loss as an index for evaluation of mechanical properties may not be appropriate.