期刊
CONSTRUCTION AND BUILDING MATERIALS
卷 225, 期 -, 页码 283-291出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2019.07.140
关键词
Fly ash; Reactive content; Si/Al ratio; Geopolymer; Dissolution; Chemical extraction
资金
- Land and Livability National Innovation Challenge, Ministry of National Development, Singapore [L2NICCFP1-2013-4]
This study investigated potential reactivity of fly ash for geopolymerization. A combined dissolution of fly ash in NaOH in conjunction with HCl extraction of fly ash-NaOH residue is proposed in this study to more accurately estimate the total reactive content and reactive Si/Al ratio of fly ash: Results show that the total reactive content of fly ash used in the current study is about 68.80%, similar to the amorphous content (66.28%) obtained using quantitative XRD and XRF. The values of reactive Si/Al ratios are between 2.65 and 2.98 depending on the duration of dissolution. The reactive Si/Al values differ significantly from the total Si/Al ratio (1.63) calculated using XRF results and also differ from the vitreous Si/Al ratio (3.75) calculated using combined XRF and XRD results. The results suggest that total or vitreous Si/Al ratio should not be used for mix proportioning of fly ash geopolymers as is generally used for metakaolin-based geopolymers. Instead, the reactive Si/Al ratio determined based on the current study should be used for fly ash geopolymer mix design. (C) 2019 Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据