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Dynamic tests of cemented paste backfill: effects of strain rate, curing time, and cement content on compressive strength

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Abstract

This article investigates the compressive strength of cemented paste backfill (CPB) under dynamic loading. To accommodate the low impedance CPB, a modified split Hopkinson pressure bar (SHPB) system is adopted. In contrast to traditional solid steel transmitted bar, a hollow aluminum transmitted bar is introduced to reduce the impedance. With this system, the dynamic stress equilibrium is achieved, which guarantees the valid dynamic material testing condition. The dynamic tests are conducted for CPB with different cement contents and curing time. It is observed that: (1) for CPB with the same curing time and cement content, the dynamic strength increases with the strain rate, (2) for CPB with the same cement content, the dynamic strength increases with the curing time, and (3) for CPB with the same curing time and tested under similar strain rate, the dynamic strength increases with the percentage of cement. This observation can be understood by considering the hydration process of cements.

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Acknowledgements

This work is supported by NSERC/Discovery grant # 72031326 and NSERC/CRD grant # 364719 in association with Barrick Gold Corporation, Xstrata Copper Canada Ltd., and Inmet Mining Corporation. K.X. also acknowledges the financial support by the opening project (#Z110802) of State Key Laboratory of Science and Technology (Beijing Institute of Technology).

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Authors and Affiliations

  1. Department of Civil Engineering, University of Toronto, Toronto, ON, M5S 1A4, Canada

    Sheng Huang, Kaiwen Xia & Lan Qiao

  2. University of Science and Technology Beijing, Beijing, 100083, China

    Lan Qiao

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  1. Sheng Huang
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  2. Kaiwen Xia
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  3. Lan Qiao
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Correspondence to Kaiwen Xia.

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Huang, S., Xia, K. & Qiao, L. Dynamic tests of cemented paste backfill: effects of strain rate, curing time, and cement content on compressive strength. J Mater Sci 46, 5165–5170 (2011). https://doi.org/10.1007/s10853-011-5449-0

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  • DOI: https://doi.org/10.1007/s10853-011-5449-0

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