Experimental study on the effect of fly ash with ammonium salt content on the properties of cemented paste backfill
文献类型：期刊论文
| 作者 | Tang, Renlong2,3; Zhao, Bingchao2,3; Li, Chao4; Xin, Jie1; Xu, Baowa2; Tian, Chuang2; Ning, Jianbo2; Li, Longqing2,3; Shao, Xiaoping2,3 |
| 刊名 | CONSTRUCTION AND BUILDING MATERIALS
 |
| 出版日期 | 2023-03-10 |
| 卷号 | 369期号:-页码:- |
| ISSN号 | 0950-0618 |
| 关键词 | Fly ash containing ammonium Cemented paste backfill Rheological properties Compressive strength Microstructure |
| 英文摘要 | The wide disposal of fly ash (FA) that contains ammonium is an essential method to realize green backfill mining and resource utilization of solid waste. In this paper, FA containing ammonium with different ammonia contents was simulated by adding NH4HSO4 to the FA. The law and mechanism of influence of ammonia content on the performance of FA-based cemented paste backfill (FA-based CPB) were explored using thorough experimenta-tion, and a maximum ammonia content of FA containing ammonium used in backfill mining was proposed. The results showed that the fresh FA-based CPB slurry could be described by the Herschel-Bulkley model (R2 >= 0.991). With the increase in the ammonia content of FA, the yield stress and viscosity of the FA-based CPB slurry increased and the slump value decreased, due to the formation of specific firm bubble bridges between the cement particles, FA, and tiny bubbles and due to the fact that tiny bubbles need more water due to their large specific surface area. In addition, the uniaxial compressive strength (UCS) and elastic modulus of FA-based CPB decreased and the peak strain increased as the ammonia content of FA increased. Specifically, the 28-d UCS of FA-based CPB with ammonia contents of 239, 639, 1139, and 2139 ppm decreased by 12.4 %, 39.5 %, 42.4 %, and 47.0 %, respectively, compared to that of FA-based CPB with ammonia content of 139 ppm. Finally, MIP, SEM, and XRD were utilized to investigate the microstructure of FA-based CPB. Overall, the ammonium-containing FA adversely affected both the flowability and mechanical properties of FA-based CPB. The results provide a reference for the green and efficient use of FA containing ammonium salts. |
| 学科主题 | Construction & Building Technology ; Engineering ; Materials Science |
| 语种 | 英语 |
| 出版者 | ELSEVIER SCI LTD |
| WOS记录号 | WOS:000931819000001 |
| 源URL | [http://119.78.100.198/handle/2S6PX9GI/35311]  |
| 专题 | 中科院武汉岩土力学所 |
| 作者单位 | 1.State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China 2.Energy School, Xi’an University of Science and Technology, Xi’an 710054, China 3.Key Laboratory of Western Mines and Hazards Prevention, Ministry of Education of China, Xi’an 710054, China 4.Shaanxi Coal Chemical Industry Technology Research Institute Co., Ltd, Xi’an 710100, China |
| 推荐引用方式 GB/T 7714 | Tang, Renlong,Zhao, Bingchao,Li, Chao,et al. Experimental study on the effect of fly ash with ammonium salt content on the properties of cemented paste backfill[J]. CONSTRUCTION AND BUILDING MATERIALS,2023,369(-):-. |
| APA | Tang, Renlong.,Zhao, Bingchao.,Li, Chao.,Xin, Jie.,Xu, Baowa.,...&Shao, Xiaoping.(2023).Experimental study on the effect of fly ash with ammonium salt content on the properties of cemented paste backfill.CONSTRUCTION AND BUILDING MATERIALS,369(-),-. |
| MLA | Tang, Renlong,et al."Experimental study on the effect of fly ash with ammonium salt content on the properties of cemented paste backfill".CONSTRUCTION AND BUILDING MATERIALS 369.-(2023):-. |
入库方式： OAI收割
来源：武汉岩土力学研究所
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