Journal
THERMOCHIMICA ACTA
Volume 623, Issue -, Pages 86-94Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.tca.2015.11.007
Keywords
Cemented gangue backfill; Binder hydration; Heat transfer; Temperature development; Modeling
Funding
- National Natural Science Foundation of China [51404271]
- Beijing Municipal Natural Science Foundation [8154053]
- State Key Laboratory for Coal Resources and Safe Mining, China University of Mining Technology [SKLCRSM13KFB05]
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Cemented gangue backfill (CGB), which is a composite material mixed by coal gangue, binder and water, is used for coal mine backfill to control strata movement and thus, reduce ground surface subsidence. Whether a CGB structure can successfully play the role of supporting the overlying roof or not is dependent on its mechanical strength, which is significantly affected by the temperature development in it. The temperature of CGB is influenced by the heat generated by binder hydration and the heat transfer between the CGB and its surroundings. In this paper, a numerical model is proposed to predict the temperature development and distribution within the hydrating CGB structure. Results from an experimental study are employed to validate the developed model. This validation outcome indicates that the model simulation is in a good agreement with the experiment investigation. The validated model is then used to analyze the effects of various factors on the temperature development within the CGB structure versus curing time. (C) 2015 Elsevier B.V. All rights reserved.
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