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Effect of calcium to silica ratio on the synthesis of calcium silicate hydrate in high alkaline desilication solution
Qi, Fang1; Zhu, Ganyu2; Zhang, Yimin1; Hou, Xinjuan2,3; Li, Shaopeng2; Zhang, Jianbo2; Li, Huiquan2,3
2020-09-09
Source PublicationJOURNAL OF THE AMERICAN CERAMIC SOCIETY
ISSN0002-7820
Pages13
AbstractHigh alkaline desilication solution (DSS), a high volume byproduct from the pretreatment of high-alumina fly ash, was used as low-cost mother liquor for the synthesis of calcium silicate hydrate (C-S-H). Through the combined analysis of X-ray diffraction, thermogravimetric analysis, X-ray fluorescence,Si-29 MAS NMR, and Brunauer-Emmett-Teller, the relationship between chemical composition and structure of C-S-H synthesized under Ca/Si of 0.83:1 to 2.0:1 was investigated. Silicon conversion and yield of product have a positive correlation with Ca/Si. Sodium uptake in C-S-H is inhibited as Ca/Si increases. The formation of sodium in C-S-H transfers from "bound Na" to "mobile Na" and aluminum from tetrahedrally coordinated Al (IV) to octahedrally coordinated Al (VI). The increase of Ca/Si leads to shortening of silicate chain and formation of more dimers, which causes more water bound in C-S-H. The mechanism of calcium addition on silicate chain obtained from DFT calculation primarily results from more interlayer calcium occurrence to affect bridging tetrahedron and cationic bounding states reorganization. Reasonable control for Ca/Si momentously contributes to the adjustment for composition and structure of C-S-H synthesized in DSS.
Keywordcalcium silicate hydrate fly ash high-alkaline solution structure
DOI10.1111/jace.17440
Language英语
WOS KeywordC-S-H ; X-RAY ; ALUMINUM ; MECHANISM ; AL-27
Funding ProjectProjects of National Natural Science Foundation of China[51704272] ; Projects of National Natural Science Foundation of China[U1810205] ; Projects of National Natural Science Foundation of China[51804293] ; Youth Innovation Promotion Association CAS[2018066]
WOS Research AreaMaterials Science
WOS SubjectMaterials Science, Ceramics
Funding OrganizationProjects of National Natural Science Foundation of China ; Youth Innovation Promotion Association CAS
WOS IDWOS:000567633200001
PublisherWILEY
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/42054
Collection中国科学院过程工程研究所
Corresponding AuthorZhu, Ganyu; Zhang, Yimin; Li, Shaopeng
Affiliation1.Wuhan Univ Sci & Technol, Coll Resources & Environm Engn, State Environm Protect Key Lab Mineral Met Resour, Wuhan 430081, Hubei, Peoples R China
2.Chinese Acad Sci, Inst Proc Engn, Key Lab Green Proc & Engn, Natl Engn Lab Hydromet Cleaner Prod Technol, Beijing 100190, Peoples R China
3.Univ Chinese Acad Sci, Beijing, Peoples R China
Recommended Citation
GB/T 7714
Qi, Fang,Zhu, Ganyu,Zhang, Yimin,et al. Effect of calcium to silica ratio on the synthesis of calcium silicate hydrate in high alkaline desilication solution[J]. JOURNAL OF THE AMERICAN CERAMIC SOCIETY,2020:13.
APA Qi, Fang.,Zhu, Ganyu.,Zhang, Yimin.,Hou, Xinjuan.,Li, Shaopeng.,...&Li, Huiquan.(2020).Effect of calcium to silica ratio on the synthesis of calcium silicate hydrate in high alkaline desilication solution.JOURNAL OF THE AMERICAN CERAMIC SOCIETY,13.
MLA Qi, Fang,et al."Effect of calcium to silica ratio on the synthesis of calcium silicate hydrate in high alkaline desilication solution".JOURNAL OF THE AMERICAN CERAMIC SOCIETY (2020):13.
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