Journal
MEASUREMENT
Volume 154, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.measurement.2020.107483
Keywords
Cemented gangue-fly ash backfill material; Static segregation; Electrical resistivity method; Bleeding; Image analysis
Funding
- Joint Funds of the National Natural Science Foundation of China, China [U1710258, U1810120]
- National Natural Science Foundation of China, China [51574172, 51804208]
- Key Technologies Research and Development Coal-Based Program of Shanxi Province, China [MQ2014-12]
- Key Research and Development Program (social development) of Shanxi Province, China [201803D31044]
- Program for Innovative Talents of Science and Technology in Shanxi Province, China [201605D211003]
- Research Fund of The State Key Laboratory of Coal Resources and Safe Mining, CUMT, China [SKLCRSM18KF016]
- China Postdoctoral Science Foundation, China [2018M632423]
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Static segregation of a cemented gangue-fly ash backfill material (CGFBM) presents a harmful impact on its mechanical and pipeline transportation performances. To evaluate the static segregation of a CGFBM in real time, electrical resistivity (ER) method is proposed by monitoring the ER change at different depths. The static stabilities of various mixtures with different mass concentrations of 74%, 76%, 78%, 80%, and 82% are evaluated in terms of the ER characteristics and derived segregation index (SI). Results showed that: for mixtures with relatively low mass concentrations (74% and 76%), the SI gradually decreases with increasing elapsed time after casting. 0.85 is the critical value. The CGFBM with a SI smaller and larger than 0.85 can be considered to have a low and high stability, respectively. The feasibility of the ER method is verified by bleeding test and image analysis method. (C) 2020 Elsevier Ltd. All rights reserved.
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