Effect of calcium to silica ratio on the synthesis of calcium silicate hydrate in high alkaline desilication solution

doi:10.1111/jace.17440

	Effect of calcium to silica ratio on the synthesis of calcium silicate hydrate in high alkaline desilication solution
	Qi, Fang 1; Zhu, Ganyu 3; Zhang, Yimin 1; Hou, Xinjuan 2,3; Li, Shaopeng 3; Zhang, Jianbo 3; Li, Huiquan 2,3
刊名	JOURNAL OF THE AMERICAN CERAMIC SOCIETY
	2020-09-09
页码	13
关键词	calcium silicate hydrate fly ash high-alkaline solution structure
ISSN号	0002-7820
DOI	10.1111/jace.17440
英文摘要	High 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.
资助项目	Projects 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关键词	C-S-H ; X-RAY ; ALUMINUM ; MECHANISM ; AL-27
WOS研究方向	Materials Science
语种	英语
出版者	WILEY
WOS记录号	WOS:000567633200001
资助机构	Projects of National Natural Science Foundation of China ; Youth Innovation Promotion Association CAS
内容类型	期刊论文
源URL	[http://ir.ipe.ac.cn/handle/122111/42053]
专题	中国科学院过程工程研究所
通讯作者	Zhu, Ganyu; Zhang, Yimin; Li, Shaopeng
作者单位	1.Wuhan Univ Sci & Technol, Coll Resources & Environm Engn, State Environm Protect Key Lab Mineral Met Resour, Wuhan 430081, Hubei, Peoples R China 2.Univ Chinese Acad Sci, Beijing, Peoples R China 3.Chinese Acad Sci, Inst Proc Engn, Key Lab Green Proc & Engn, Natl Engn Lab Hydromet Cleaner Prod Technol, Beijing 100190, Peoples R China
推荐引用方式 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.