Abstract
The use of cemented paste backfills (CPB, a mine composite tailings material) in underground mining is currently increasing in importance globally. However, despite the tremendous progress made in understanding the factors affecting the performance of CPB, little attention has been devoted to the impact of high temperatures on its mechanical properties. This article presents the results of experimental investigations into the mechanical responses of CPB when subjected to high thermal loads. Samples made with silicate and pure cement or a mix of 50/50 cement and slag or fly ash were heated at 100, 200, 400 and 600°C, and the unconfined compressive strength, tensile strength, modulus of elasticity, stress–strain behaviour and microstructure evaluated by laboratory tests. The results show that high temperatures have a significant influence on the mechanical properties of CPB, which should be taken into account when determining an appropriate mix for the binder.
Résumé
L’utilisation de remblais en pâte cimenté dans l’exploitation minière prend aujourd’hui beaucoup d’importance dans le monde et particulièrement au Canada. Cependant, malgré d’énormes progrès établis dans la compréhension des facteurs pouvant affecter les propriétés mécaniques ou la performance de ces remblais, peu d’études ont été consacrées à l’évaluation de l’impact des hautes températures sur les propriétés mécaniques des remblais. Pour cette raison, cet article présente les résultats d’études expérimentales sur la réponse mécanique des remblais en pâte cimenté soumis à des chargements thermiques. Plusieurs types de remblais en pâte cimentés ont été d’abord chauffés à différentes températures (100°C, 200°C, 400°C and 600°C). La résistance à la compression uniaxiale, la résistance à la traction indirecte, le module d’élasticité, le comportement contrainte-déformation et la microstructure des remblais chauffés ont été déterminés en conduisant des essais de laboratoire. Les résultats montrent que les hautes températures ont une influence significative sur les propriétés mécaniques des remblais en pâte cimentés.
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Orejarena, L., Fall, M. Mechanical response of a mine composite material to extreme heat. Bull Eng Geol Environ 67, 387–396 (2008). https://doi.org/10.1007/s10064-008-0148-z
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DOI: https://doi.org/10.1007/s10064-008-0148-z