Deep insight into mechanical behavior and microstructure mechanism of quicklime-activated ground granulated blast-furnace slag pastes
文献类型：期刊论文
| 作者 | Cai, Guang-Hua1,2,3; Zhou, Yi-Fan2; Li, Jiang -Shan3; Han, Li-Jun3; Poon, Chi Sun2 |
| 刊名 | CEMENT & CONCRETE COMPOSITES
 |
| 出版日期 | 2022-11-01 |
| 卷号 | 134期号:-页码:- |
| ISSN号 | 0958-9465 |
| 关键词 | Ground granulated blast-furnace slag Slag activator Mix design Mechanical behavior Microstructure |
| 英文摘要 | Ground granulated blast-furnace slag (GGBS) could be used as a potential low-carbon binder when activated by a moderate activator. The use of seawater in producing construction materials has increasingly attracted attention in some coastal engineering with scarce freshwater. This study aims at studying the impact of quicklime pro-portions on the mechanical behavior and microstructure of the binder. The mechanical behaviors were inves-tigated through unconfined compression tests. The hydration kinetics and microstructure characteristics were examined using XRD, TGA, FTIR, and SEM-EDX. The results indicated that the hydration heat and exothermic peaks enhanced with the quicklime proportion. The exothermic peaks were observed in the first few minutes and 4-18 h. The quicklime-GGBS pastes generated the highest UCS (>18 MPa) occurred at a quicklime proportion of 0.15. The platy-like portlandite, fibrous calcium silicate hydrate (CSH), needle-like ettringite (AFt), and Friedel's salt (Fs) were detected in XRD and SEM. The Cl- in seawater promoted the formation of Fs. The XRD peaks of CSH and AFt/Fs raised and then descended with the quicklime proportion, and reached the maximum at the quicklime content of 0.15. The mass percentage of CSH and AFt/Fs from TGA first increased and then became stable when the quicklime content was 0.1-0.15. The number of amorphous GGBS particles and pores decreased under the quicklime proportion of 0.05-0.15, while the portlandite increased as the quicklime content changed from 0.15 to 0.3. Overall, the quicklime-GGBS binder could provide a potential sustainable construction material in waste recycling and freshwater saving. |
| 学科主题 | Construction & Building Technology ; Materials Science |
| 语种 | 英语 |
| 出版者 | ELSEVIER SCI LTD |
| WOS记录号 | WOS:000864863800004 |
| 源URL | [http://119.78.100.198/handle/2S6PX9GI/35082]  |
| 专题 | 中科院武汉岩土力学所 |
| 作者单位 | 1.College of Civil and Engineering, Nanjing Forestry University, Nanjing, 210037, China 2.Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong 3.State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, 430071, China |
| 推荐引用方式 GB/T 7714 | Cai, Guang-Hua,Zhou, Yi-Fan,Li, Jiang -Shan,et al. Deep insight into mechanical behavior and microstructure mechanism of quicklime-activated ground granulated blast-furnace slag pastes[J]. CEMENT & CONCRETE COMPOSITES,2022,134(-):-. |
| APA | Cai, Guang-Hua,Zhou, Yi-Fan,Li, Jiang -Shan,Han, Li-Jun,&Poon, Chi Sun.(2022).Deep insight into mechanical behavior and microstructure mechanism of quicklime-activated ground granulated blast-furnace slag pastes.CEMENT & CONCRETE COMPOSITES,134(-),-. |
| MLA | Cai, Guang-Hua,et al."Deep insight into mechanical behavior and microstructure mechanism of quicklime-activated ground granulated blast-furnace slag pastes".CEMENT & CONCRETE COMPOSITES 134.-(2022):-. |
入库方式： OAI收割
来源：武汉岩土力学研究所
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