Journal
CONSTRUCTION AND BUILDING MATERIALS
Volume 237, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2019.117738
Keywords
Cemented tailings backfill; Temperature; Strength; Microstructure; Ultrasonic; Mine
Categories
Funding
- National Key Technologies Research & Development Program [2018YFC0808403]
- government of China [SQ2018YFE011020]
- government Mongolia [SQ2018YFE011020]
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With the increase of mining depth in mines, the underground high-temperature becomes more and more serious. The main objective of this study is to investigate the coupled effect of curing temperature and age on compressive behavior, microstructural and ultrasonic properties of cemented tailings backfill (CTB). Unconfined compressive strength (UCS) testing was performed on the CTB specimens cured at 20, 35 and 50 degrees C for 3, 7 and 28 days, respectively. The X-ray diffraction (XRD), thermal analysis (TG/DTG), scanning electron microscope (SEM) and mercury intrusion porosimetry (MIP) were used to determine the microstructure and mineralogy of hardened CTB specimens. Furthermore, ultrasonic pulse velocity (UPV) testing was resorted to assess the relationship between UCS and UPV of CTB specimens. The results show that the compressive strength and microstructural properties of CTB are strongly affected by curing temperature and age. Higher curing temperature and longer curing time show significant enhancement effect on the compressive strength and refinement of pore structure of CTB specimens. The change in curing temperature leads to change in the mode of failure. The failure patterns of CTB specimens are mainly characterized by tensile, shear failure and hybrid failure. Furthermore, the relationship between UCS and UPV of CTB specimens was discussed and evaluated based on regression analysis. A linear relationship between UCS and UPV is obtained to assess the strength development of CTB as a nondestructive way. (C) 2019 Elsevier Ltd. All rights reserved.
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