Improvement of calcium sulfoaluminate cement with carbide slag-modified phosphogypsum: Performance and micromechanisms
文献类型：期刊论文
| 作者 | Dong, Meng2,3; Jin, Jiaxu1; Li, Jiang-Shan2,4; Wang, Kaikai2; Qiu, Shuo2,5 |
| 刊名 | CASE STUDIES IN CONSTRUCTION MATERIALS
 |
| 出版日期 | 2024-12-01 |
| 卷号 | 21页码:17 |
| 关键词 | Phosphogypsum Carbide slag Calcium sulfoaluminate cement Hydration characteristics Microstructure evoution |
| ISSN号 | 2214-5095 |
| DOI | 10.1016/j.cscm.2024.e03931 |
| 英文摘要 | Phosphogypsum (PG) is an industrial by-product that is difficult to manage and poses serious environmental threats. Long-term accumulation of PG can potentially pollute land and water due to its acidity and harmful impurities. In this study, the raw PG and carbide slag (CS)-modified PG were used to replace anhydrite in calcium sulfoaluminate (CSA) cement, and the performance and micromechanisms of PG-CSA and CS-PG-CSA were investigated. The engineering performances including setting time, fluidity, compressive strength, and hydration characteristics of PG-CSA and CS-PG-CSA were investigated. Furthermore, the crystalline phases and microstructure evolutions of hydration products were confirmed by hydration heat, X-ray diffraction (XRD), thermogravimetry-differential thermal analysis (TG-DTA) and scanning electron microscopyenergy dispersive spectrometer (SEM-EDS) tests. The results showed that CS could effectively remove the acidity and impurities of PG by converting PO4 3- and F- into Ca3(PO4)2 and CaF2. When 20 % raw PG was mixed with CSA clinker, the strength of PG-CSA reached a maximum of 65.83 MPa, which is 41.81 % higher than that of commercial CSA cement. Compared to commercial CSA cement, PG-CSA exhibits a delayed hydration heat release peak, resulting in a longer setting time and greater fluidity. However, CS effectively increases the strength of PG-CSA, but it shortens the setting time and reduces the fluidity. The early and late hydration products of PGCSA and CS-PG-CSA are mainly ettringite (AFt) and aluminum hydroxide (AH3), respectively. The results of the environmental assessment unequivocally demonstrate that the developed product surpasses traditional cement in all evaluated metrics, achieving a remarkable reduction in CO2 emissions of nearly 50 %. The key findings indicate that the use of CS-modified PG in CSA cement can not only improve engineering performance but also promote sustainability and economic efficiency, demonstrating significant potential for widespread application. |
| 资助项目 | International Partnership Program of Chinese Academy of Sciences[115242KYSB20200002] ; Major science and technology program of Inner Mongolia[2021ZD0007] ; Inner Mongolia Autonomous Region science and technology program[2022YFHH0075] ; China Postdoctoral Science Foundation[2022M723347] |
| WOS研究方向 | Construction & Building Technology ; Engineering ; Materials Science |
| 语种 | 英语 |
| WOS记录号 | WOS:001349887400001 |
| 出版者 | ELSEVIER |
| 源URL | [http://119.78.100.198/handle/2S6PX9GI/43098]  |
| 专题 | 中科院武汉岩土力学所 |
| 通讯作者 | Li, Jiang-Shan |
| 作者单位 | 1.Liaoning Tech Univ, Sch Civil Engn, Fuxin 123000, Liaoning, Peoples R China 2.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Peoples R China 3.Ningbo Univ Technol, Sch Civil & Transportat Engn, Ningbo 315211, Peoples R China 4.HK PolyU Joint Lab Solid Waste Sci, IRSM CAS, Hung Hom, Kowloon, Hong Kong, Peoples R China 5.Chongqing Univ, Sch Civil Engn, Chongqing 400044, Peoples R China |
| 推荐引用方式 GB/T 7714 | Dong, Meng,Jin, Jiaxu,Li, Jiang-Shan,et al. Improvement of calcium sulfoaluminate cement with carbide slag-modified phosphogypsum: Performance and micromechanisms[J]. CASE STUDIES IN CONSTRUCTION MATERIALS,2024,21:17. |
| APA | Dong, Meng,Jin, Jiaxu,Li, Jiang-Shan,Wang, Kaikai,&Qiu, Shuo.(2024).Improvement of calcium sulfoaluminate cement with carbide slag-modified phosphogypsum: Performance and micromechanisms.CASE STUDIES IN CONSTRUCTION MATERIALS,21,17. |
| MLA | Dong, Meng,et al."Improvement of calcium sulfoaluminate cement with carbide slag-modified phosphogypsum: Performance and micromechanisms".CASE STUDIES IN CONSTRUCTION MATERIALS 21(2024):17. |
入库方式： OAI收割
来源：武汉岩土力学研究所
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