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Experimental evaluation of weathering of mine shaft lining materials

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Document pages: 12 pages

Abstract: Many shaft collapses are related to the deterioration and damage of masonry shaft wall materials. In modern mines, concrete is widely used to provide support. In order to analyze the stability of shaft, the characteristics of lining need to be clearly determined. Long term exposure to harsh mine water will have a great impact on the performance of masonry and concrete. This paper mainly studies the weathering effect of mine water on lining materials (brick, mortar and concrete). In order to reproduce the weathering process, the samples were put into drinking water, artificial mine water and more corrosive mine water solution for less than one year. Four stages of laboratory tests were conducted throughout the time period to evaluate the degradation of mechanical propertiesties 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.

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