Recycling thermal modified phosphogypsum in calcium sulfoaluminate cement: Evolution of engineering properties and micro-mechanism
文献类型：期刊论文
| 作者 | Dong, Meng; Li, Jiang -Shan; Lang, Lei; Chen, Xin; Jin, Jiaxu; Ma, Wei |
| 刊名 | CONSTRUCTION AND BUILDING MATERIALS
 |
| 出版日期 | 2023-04-10 |
| 卷号 | 373 |
| ISSN号 | 0950-0618 |
| 关键词 | Calcium sulphoaluminate cement Phosphogypsum Thermal modification Hydration process |
| 英文摘要 | The phosphogypsum (PG) can be used as a substitute for calcium sulphoaluminate cement (CSC) due to its high content of calcium sulfate dehydrate. In this study, the engineering properties including setting time, compressive strength and fluidity index of CSC with addition of thermal modified phosphogysum (MPG) were experimentally investigated. Furthermore, the micro-mechanisms including crystalline phase and microstructure evolutions of CSC incorporating MPG under different thermal treatment temperatures were analyzed via con-ducting X-ray diffraction (XRD), heat of hydration, thermogravimetry (TG) and scanning electron microscopy (SEM) tests. The results show that the optimum PG content and thermal modification temperature were respectively 10% and 300 degrees C, which achieved the maximum compressive strength of 41.59 MPa. The hydration heat release peak of CSC with 300 degrees C MPG was advanced, contributing to shorter setting time and poor fluidity of CSC. Whereas after incorporating untreated and 100 degrees C MPG, the hydration exothermic peak of CSC lagged behind, causing higher retarding effect and better fluidity. The main hydration products of ettringite (AFt) and alumina gel (AH3) in CSC-MPG mixture were respectively produced in the early and later stages, which were similar to that in pure CSC. The amount of AFt was the most under the optimum incorporation of 10% MPG at 300 degrees C, which was mainly responsible for the highest structure density. The key findings in this study can achieve the double benefits of utilizing waste PG and improving the engineering properties of CSC. |
| 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:000992113400001 |
| 源URL | [http://119.78.100.198/handle/2S6PX9GI/34981]  |
| 专题 | 中科院武汉岩土力学所 |
| 作者单位 | 1.Liaoning Technical University; 2.Chinese Academy of Sciences; Wuhan Institute of Rock & Soil Mechanics, CAS |
| 推荐引用方式 GB/T 7714 | Dong, Meng,Li, Jiang -Shan,Lang, Lei,et al. Recycling thermal modified phosphogypsum in calcium sulfoaluminate cement: Evolution of engineering properties and micro-mechanism[J]. CONSTRUCTION AND BUILDING MATERIALS,2023,373. |
| APA | Dong, Meng,Li, Jiang -Shan,Lang, Lei,Chen, Xin,Jin, Jiaxu,&Ma, Wei.(2023).Recycling thermal modified phosphogypsum in calcium sulfoaluminate cement: Evolution of engineering properties and micro-mechanism.CONSTRUCTION AND BUILDING MATERIALS,373. |
| MLA | Dong, Meng,et al."Recycling thermal modified phosphogypsum in calcium sulfoaluminate cement: Evolution of engineering properties and micro-mechanism".CONSTRUCTION AND BUILDING MATERIALS 373(2023). |
入库方式： OAI收割
来源：武汉岩土力学研究所
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