Strength evolution and microstructure of alkali-activated ultra-fine slag in low-temperature environments
文献类型：期刊论文
| 作者 | Yang, Hong1,2; Wang, Hailong1,6; Li, Jiangshan2,3,4; Zhang, Zhaorong2,3,5; Huang, Xiao2,3,4; Xue, Qiang2,3,4
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| 刊名 | CONSTRUCTION AND BUILDING MATERIALS
 |
| 出版日期 | 2024-07-12 |
| 卷号 | 435页码:14 |
| 关键词 | Low-temperature curing Sodium silicate Ultra-fine slag Compressive strength Hydration mechanism |
| ISSN号 | 0950-0618 |
| DOI | 10.1016/j.conbuildmat.2024.136852 |
| 英文摘要 | At low temperatures, the hydration rate of Portland cement significantly slows down, resulting in a decrease in its strength. Additionally, the pore solution freezes easily. As a kind of low-carbon cementitious material, alkaliactivated slag (AAS) material has a short setting time at room temperature and a high early strength, meanwhile the alkali solution does not freeze at low temperatures. This study investigates the evolution mechanism of the strength and microstructure of AAS pastes cured at 0 degree celsius. Slag with different fineness was activated by a sodium silicate solution with different moduli, whose strength was compared with that of an AAS paste cured at 20 degrees C. The setting time, compressive strength, hydration process, pore structure, freezing point, and microstructure of the AAS paste were studied, whose results showed that the setting time of the AAS paste was obviously prolonged, and the compressive strength decreased under low-temperature curing. After the activation of slag ground, the early compressive strength of the AAS paste was significantly improved, whose reason was that the hydration degree of the paste was improved after slag ground, and that a dense pore structure was formed. The freezing point of the AAS paste was approximately -26 degrees C, which, remarkably, even at -40 degrees C, was still capable of undergoing a weak chemical reaction, producing an exothermic enthalpy. This characteristic makes alkaliactivated ultrafine slag a highiy-promising cementitious material for curing at low temperatures. |
| 资助项目 | Space Station Application and Devel- opment Program Space Science and Application Projects[SCP03-04-02] |
| WOS研究方向 | Construction & Building Technology ; Engineering ; Materials Science |
| 语种 | 英语 |
| WOS记录号 | WOS:001248731600002 |
| 出版者 | ELSEVIER SCI LTD |
| 源URL | [http://119.78.100.198/handle/2S6PX9GI/42307]  |
| 专题 | 中科院武汉岩土力学所 |
| 通讯作者 | Li, Jiangshan |
| 作者单位 | 1.Inner Mongolia Agr Univ, Coll Water Conservancy & Civil Engn, Hohhot 10018, Peoples R China 2.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Peoples R China 3.IRSM CAS HK PolyU Joint Lab Solid Waste Sci, Wuhan 430071, Peoples R China 4.Hubei Prov Key Lab Contaminated Sludge & Soil Sci, Wuhan 430071, Peoples R China 5.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 6.Autonomous Reg Collaborat Innovat Ctr Integrated W, Hohhot 010018, Peoples R China |
| 推荐引用方式 GB/T 7714 | Yang, Hong,Wang, Hailong,Li, Jiangshan,et al. Strength evolution and microstructure of alkali-activated ultra-fine slag in low-temperature environments[J]. CONSTRUCTION AND BUILDING MATERIALS,2024,435:14. |
| APA | Yang, Hong,Wang, Hailong,Li, Jiangshan,Zhang, Zhaorong,Huang, Xiao,&Xue, Qiang.(2024).Strength evolution and microstructure of alkali-activated ultra-fine slag in low-temperature environments.CONSTRUCTION AND BUILDING MATERIALS,435,14. |
| MLA | Yang, Hong,et al."Strength evolution and microstructure of alkali-activated ultra-fine slag in low-temperature environments".CONSTRUCTION AND BUILDING MATERIALS 435(2024):14. |
入库方式： OAI收割
来源：武汉岩土力学研究所
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