Early-age hydration characteristics of modified coal gasification slag-cement-aeolian sand paste backfill
文献类型：期刊论文
| 作者 | Xin, Jie3,5; Liu, Lang1,2,4; Jiang, Quan5; Yang, Pan2,4; Qu, Huisheng2,4; Xie, Geng2,4 |
| 刊名 | CONSTRUCTION AND BUILDING MATERIALS
 |
| 出版日期 | 2022-03-07 |
| 卷号 | 322页码:12 |
| 关键词 | MGCAPB Hydration kinetic Krstulovic-Dabic model Strength properties Microscopic characteristics |
| ISSN号 | 0950-0618 |
| DOI | 10.1016/j.conbuildmat.2021.125936 |
| 英文摘要 | A clear understanding of the hydration characteristics of cemented paste backfill (CPB) is helpful to analyze the reasons for the defects of low strength, large deformation and high cost in the early curing period of CPB. This is conducive to realizing the sustainable utilization of solid waste. In this paper, the hydration exothermic characteristics of MGCAPB slurry was tested. Moreover, uniaxial compressive strength(UCS) tests were carried out on the MGCAPB with curing times of 3 and 28 d. In addition, microstructure tests such as TG-DTG and SEM were performed on the MGCAPB with curing time of 3d. The hydration exothermic characteristics of MGCAPB were emphatically studied, the hydration kinetic parameters of MGCAPB were analyzed exclusively by using Krstulovic-Dabic model. In addition, the mechanical properties and microscopic characteristics of MGCAPB were studied. The results shows that the hydration kinetic process of MGCAPB slurry can be described by nucleation and crystal growth (NG), phase boundary reaction (I) and diffusion (D). All the formulations of MGCAPB went through the NG-I-D stage. The process of hydration reaction was controlled by NG at the initial hydration stage, and gradually changed to process I and process D with the increase of hydration degree. Compared to the Control group, The alpha 1 of the MGCAPB activated by the activator was high, indicating that the NG process changed to the I process only when the hydration degree was high, which was related to the effective water-cement ratio of the slurry and nucleation effect. In addition, according to the requirement(3d >= 0.5 MPa and 28d >= 1.0 MPa) that CPB can provide good roof support in a typical underground mine. In this experiment, the mechanical propertiesof all formulations met the requirements, except for the 3d UCS of the Control group(0.37 MPa) and the C-C1 (0.46 MPa). Finally, TG-DTG and SEM were used to analyze the microstructures of MGCAPB with activator type and dosage. The research results can provide a new approach for intensive and comprehensive utilization of solid waste resources. |
| 资助项目 | National Natural Science Foundation of China[51674188] ; National Natural Science Foundation of China[51874229] ; National Natural Science Foundation of China[51504182] ; Shaanxi Innovative Talents Cultivate Program-New-star Plan of Science and Technology[2018KJXX-083] ; Natural Science Basic Research Plan of Shaanxi Province of China[2015JQ5187] ; Natural Science Basic Research Plan of Shaanxi Province of China[2019JM-074] ; Outstanding Youth Science Fund of Xi'an University of Science and Technology[2018YQ2-01] |
| WOS研究方向 | Construction & Building Technology ; Engineering ; Materials Science |
| 语种 | 英语 |
| WOS记录号 | WOS:000750961900001 |
| 出版者 | ELSEVIER SCI LTD |
| 源URL | [http://119.78.100.198/handle/2S6PX9GI/34428]  |
| 专题 | 中科院武汉岩土力学所 |
| 通讯作者 | Liu, Lang; Jiang, Quan |
| 作者单位 | 1.Minist Educ China, Key Lab Western Mines & Hazards Prevent, Xian 710054, Peoples R China 2.Res Ctr Funct Backfill Technol Mine, Xian 710054, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 4.Xian Univ Sci & Technol, Energy Sch, Xian 710054, Peoples R China 5.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Peoples R China |
| 推荐引用方式 GB/T 7714 | Xin, Jie,Liu, Lang,Jiang, Quan,et al. Early-age hydration characteristics of modified coal gasification slag-cement-aeolian sand paste backfill[J]. CONSTRUCTION AND BUILDING MATERIALS,2022,322:12. |
| APA | Xin, Jie,Liu, Lang,Jiang, Quan,Yang, Pan,Qu, Huisheng,&Xie, Geng.(2022).Early-age hydration characteristics of modified coal gasification slag-cement-aeolian sand paste backfill.CONSTRUCTION AND BUILDING MATERIALS,322,12. |
| MLA | Xin, Jie,et al."Early-age hydration characteristics of modified coal gasification slag-cement-aeolian sand paste backfill".CONSTRUCTION AND BUILDING MATERIALS 322(2022):12. |
入库方式： OAI收割
来源：武汉岩土力学研究所
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