Effects of pre-setting chemical exchanges on geopolymers cast in saline waters
文献类型：期刊论文
| 作者 | Ge, Xiaonan5,6; Guo, Brandon4; Guo, Dongdong2,3; Tao, Mingjiang1; Zhang, Guoping5 |
| 刊名 | CONSTRUCTION AND BUILDING MATERIALS
 |
| 出版日期 | 2021-11-15 |
| 卷号 | 308页码:16 |
| 关键词 | Fly ash Geopolymer Metakaolin Na/Al molar ratio Saline solution Strength |
| ISSN号 | 0950-0618 |
| DOI | 10.1016/j.conbuildmat.2021.125020 |
| 英文摘要 | This paper presents an experimental investigation of the effects of pre-setting chemical exchanges on the mechanical and chemical properties of geopolymers cast and cured in saline solutions of 0, 15, and 35 ppt in concentration to mimic saline underground and underwater environments, using a mixture of Class C fly ash and metakaolin at a mass ratio of 1:1 as the raw material. While the Si/Al molar ratio of the studied geopolymer was fixed at 2.00, the Na/Al ratio varied from 0.67, 0.80, 0.84, to 1.00. Upon completion of 28-day curing, the mechanical properties, mineralogy, microstructure, and chemical compositions of the geopolymers were characterized by unconfined compression, X-ray diffraction, electron microscopy, and X-ray fluorescence, respectively, while changes in the pH and salinity of the curing solutions were also measured. Results show that the effect of casting and curing in saline solutions on mechanical properties depends upon both the solution's salinity and geopolymer's Na/Al ratio: while the strength of geopolymers with a Na/Al ratio of 0.67 and 0.80 increases with the salinity, the counterparts with a Na/Al ratio of 0.84 and 1.00 exhibit the opposite. The underlying mechanisms are actually the pre-setting chemical exchanges between the under-curing geopolymer slurry and curing water, which are retarded and mitigated by the setting and hardening of the geopolymer slurry. The new results uncover that there exists a critical Na/Al ratio for the highest mechanical strength of geopolymers cast in saline waters, and excessive Na+ cations diffused into the geopolymer slurry may be detrimental to the strength development. |
| 资助项目 | US National Science Foundation (NSF)[CMMI-1405745/1301070] |
| WOS研究方向 | Construction & Building Technology ; Engineering ; Materials Science |
| 语种 | 英语 |
| WOS记录号 | WOS:000708145200003 |
| 出版者 | ELSEVIER SCI LTD |
| 源URL | [http://119.78.100.198/handle/2S6PX9GI/28512]  |
| 专题 | 中科院武汉岩土力学所 |
| 通讯作者 | Guo, Dongdong; Zhang, Guoping |
| 作者单位 | 1.Worcester Polytech Inst, Dept Civil & Environm Engn, Worcester, MA 01609 USA 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Peoples R China 4.Cinco Ranch High Sch, Katy, TX 77494 USA 5.Univ Massachusetts, Dept Civil & Environm Engn, Amherst, MA 01003 USA 6.Hunan Univ, Coll Civil Engn, Key Lab Green & Adv Civil Engn Mat & Applicat Tec, Changsha 410082, Peoples R China |
| 推荐引用方式 GB/T 7714 | Ge, Xiaonan,Guo, Brandon,Guo, Dongdong,et al. Effects of pre-setting chemical exchanges on geopolymers cast in saline waters[J]. CONSTRUCTION AND BUILDING MATERIALS,2021,308:16. |
| APA | Ge, Xiaonan,Guo, Brandon,Guo, Dongdong,Tao, Mingjiang,&Zhang, Guoping.(2021).Effects of pre-setting chemical exchanges on geopolymers cast in saline waters.CONSTRUCTION AND BUILDING MATERIALS,308,16. |
| MLA | Ge, Xiaonan,et al."Effects of pre-setting chemical exchanges on geopolymers cast in saline waters".CONSTRUCTION AND BUILDING MATERIALS 308(2021):16. |
入库方式： OAI收割
来源：武汉岩土力学研究所
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