Rheological properties, mechanical characteristics, and microstructures of gangue-cemented paste backfill: Linking to loess doses
文献类型：期刊论文
| 作者 | Zhao, Bingchao3,4; Zhai, Di4; Xin, Jie1,2; Guo, Yaxin4; Wang, Jingbin4; Wei, Qimeng4; Wang, Hailong4; Tang, Renlong3,4 |
| 刊名 | ARABIAN JOURNAL OF GEOSCIENCES
 |
| 出版日期 | 2022-02-01 |
| 卷号 | 15期号:3页码:12 |
| ISSN号 | 1866-7511 |
| 关键词 | Loess gauge-cemented paste backfill rheology properties microstructure |
| DOI | 10.1007/s12517-022-09472-x |
| 英文摘要 | Efficient and sustainable development is the core of green mining. In this paper, natural loess (LO), fly ash (FA), gangue (GA), ordinary Portland cement (OPC), and mixing water were used to prepare gangue-cemented paste backfill (GCPB) for underground filling mining. To investigate the effect of partial replacement of FA with natural LO on GCPB performance, GCPB specimens with varying LO doses were produced. Rheological tests, slump tests, compression tests, X-ray diffraction (XRD), and scanning electron microscopy (SEM) were used to examine the rheological properties, macroscopic strength, and microstructural evolution of GCPB. The results of the experiments reveal that 1) the GCPB slurries were in accordance with the H-B model at various LO doses. The yield stress increased with increasing LO dose because the content of small particles increased. Specifically, the LO doses were positively correlated with the content of fine particles and yield stress. The increase in the amount of small particles resulted in a significant increase in their ability to absorb free water, an increase in particle friction, and an increase in yield stress. Moreover, the slump (219-276 mm) of the GCPB slurry increased and subsequently decreased as the LO dose increased. 2) With increasing curing time and decreasing LO dose, the UCS improved. The UCS with a curing time of 3 d showed a trend of first increasing and then decreasing (due to the obvious influence of pore size) with increasing LO doses. In addition, the UCS decreased from 4.09 MPa (LF-1) to 2.15 MPa (LF-6) when the curing time was 28 d. The strength of the mine filling material was generally 1.5 MPa-2.0 MPa, and all the formulas can meet industrial requirements. 3) XRD and SEM had been used to examine the hydration products of GCPB samples. The hydration products of GCPB with LO doses were mostly composed of calcium silicate hydrate (C-S-H), calcium aluminate hydrate (C-A-H), calcium hydroxide (CH), ettringite (AFt), and gismondite (CaAl2 center dot Si2O8 center dot 4H(2)O). These hydration products with microporous low-density materials filled large pores and cemented them with GA particles, which improved the UCS of the GCPB specimens. Studying the rheological properties, mechanical properties, hydration products, and microstructure of GCPBs is an important prerequisite for green mining. |
| 资助项目 | National Natural Science Foundation of China[52074208] ; National Natural Science Foundation of China[51874230] ; Innovation Capability Support Program of Shaanxi Province-Science and Technology Innovation Team Project[2018TD-038] ; Natural Science Basic Research Program of Shaanxi Province (Shaanxi Coal Joint Fund)[2019JLM-41] |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| 出版者 | SPRINGER HEIDELBERG |
| WOS记录号 | WOS:000747046800005 |
| 源URL | [http://119.78.100.198/handle/2S6PX9GI/34403]  |
| 专题 | 中科院武汉岩土力学所 |
| 通讯作者 | Zhao, Bingchao; Xin, Jie |
| 作者单位 | 1.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 2.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Peoples R China 3.Minist Educ China, Key Lab Western Mines & Hazards Prevent, Xian 710054, Peoples R China 4.Xian Univ Sci & Technol, Energy Sch, Xian 710054, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhao, Bingchao,Zhai, Di,Xin, Jie,et al. Rheological properties, mechanical characteristics, and microstructures of gangue-cemented paste backfill: Linking to loess doses[J]. ARABIAN JOURNAL OF GEOSCIENCES,2022,15(3):12. |
| APA | Zhao, Bingchao.,Zhai, Di.,Xin, Jie.,Guo, Yaxin.,Wang, Jingbin.,...&Tang, Renlong.(2022).Rheological properties, mechanical characteristics, and microstructures of gangue-cemented paste backfill: Linking to loess doses.ARABIAN JOURNAL OF GEOSCIENCES,15(3),12. |
| MLA | Zhao, Bingchao,et al."Rheological properties, mechanical characteristics, and microstructures of gangue-cemented paste backfill: Linking to loess doses".ARABIAN JOURNAL OF GEOSCIENCES 15.3(2022):12. |
入库方式： OAI收割
来源：武汉岩土力学研究所
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