Effects of pretreated recycled fine aggregates on the mechanical properties and microstructure of alkali-activated mortar
文献类型：期刊论文
| 作者 | Xie, Jianhe1,2; Li, Jianglin1; Zhang, Baifa1; Chen, Wei1; Zhong, Huaicheng1; Yang, Jian3; Yu, Ting4; Feng, Yuan1 |
| 刊名 | CASE STUDIES IN CONSTRUCTION MATERIALS
 |
| 出版日期 | 2024-07-01 |
| 卷号 | 20页码:15 |
| 关键词 | Recycled fine aggregate (RFA) Calcination Carbonation Recycled alkali-activated mortar (RAAM) Microstructure |
| ISSN号 | 2214-5095 |
| DOI | 10.1016/j.cscm.2023.e02819 |
| 英文摘要 | Compared with traditional cement-based binders, alkali-activated binders can be improved upon combination with recycled aggregates to produce a promising and new green construction material. However, during this process, a pretreatment method is needed to alleviate the negative impact of recycled aggregates on the properties of alkali-activated materials. In this study, fly ash (FA), ground granulated blast furnace slag (GGBFS) and recycled powder (RP) were used as precursors, and recycled fine aggregates (RFAs) were used to replace natural fine aggregates (NFAs) to prepare recycled alkali-activated mortar (RAAM). Various RFA replacement ratios (0, 25%, 50% and 100%), pretreatment methods (calcination temperature and carbonation time) and alkaline moduli (0.8, 0.95, 1.1 and 1.25) were investigated. The effects of these parameters on the fresh and hardened properties, chemical composition and microstructure of RAAM were investigated. The results showed that the mechanical properties of RAAM gradually decreased with an increasing RFA replacement ratio due to the poor physical properties of RFA and its poor matris binding. Two pretreatment methods (optimal calcination at 400 degrees C and carbonation at 6 h) were effective in improving the properties of RFA and thus the mechanical properties of RAAM. Calcination removed the adhered mortar from RFA and thus improved the mechanical properties of RAAM. Carbonation of RFA enhanced the quality of the attached mortar, which strengthened the RFA and provided better mechanical properties. In addition, microstructural analyses showed that RAAM prepared from pretreated RFA had a dense microstructure and a low critical pore size. |
| WOS研究方向 | Construction & Building Technology ; Engineering ; Materials Science |
| 语种 | 英语 |
| WOS记录号 | WOS:001149232800001 |
| 源URL | [http://ir.gig.ac.cn/handle/344008/76140]  |
| 专题 | 中国科学院矿物学与成矿学重点实验室 |
| 通讯作者 | Feng, Yuan |
| 作者单位 | 1.Guangdong Univ Technol, Sch Civil & Transportat Engn, Guangzhou 510006, Guangdong, Peoples R China 2.Guangdong AIB Polytech, Guangzhou 510507, Guangdong, Peoples R China 3.Univ Birmingham, Sch Civil Engn, Birmingham B152TT, England 4.Chinese Acad Sci, CAS Key Lab Mineral & Metallogeny, Guangdong Prov Key Lab Mineral Phys & Mat, Guangzhou Inst Geochem,Inst Earth Sci, Guangzhou 510640, Peoples R China |
| 推荐引用方式 GB/T 7714 | Xie, Jianhe,Li, Jianglin,Zhang, Baifa,et al. Effects of pretreated recycled fine aggregates on the mechanical properties and microstructure of alkali-activated mortar[J]. CASE STUDIES IN CONSTRUCTION MATERIALS,2024,20:15. |
| APA | Xie, Jianhe.,Li, Jianglin.,Zhang, Baifa.,Chen, Wei.,Zhong, Huaicheng.,...&Feng, Yuan.(2024).Effects of pretreated recycled fine aggregates on the mechanical properties and microstructure of alkali-activated mortar.CASE STUDIES IN CONSTRUCTION MATERIALS,20,15. |
| MLA | Xie, Jianhe,et al."Effects of pretreated recycled fine aggregates on the mechanical properties and microstructure of alkali-activated mortar".CASE STUDIES IN CONSTRUCTION MATERIALS 20(2024):15. |
入库方式： OAI收割
来源：广州地球化学研究所
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