Effect of composite ratio of composite crystal modifiers on the properties of calcined gypsum

doi:10.1016/j.conbuildmat.2024.138609

IMR OpenIR

	Effect of composite ratio of composite crystal modifiers on the properties of calcined gypsum
	Wang, Shengchang 1; Hao, Jianying 1; Zhu, Zhenguo 2; Chen, Jianing 1; Tian, Bo 1
通讯作者	Hao, Jianying(jyty2280@163.com) ; Zhu, Zhenguo(zgzhu@imr.ac.cn)
	2024-11-08
发表期刊	CONSTRUCTION AND BUILDING MATERIALS
ISSN	0950-0618
卷号	450 页码:8
摘要	Flue-gas desulfurization gypsum (FGD gypsum), as a type of solid waste, can be recycled to prepare calcined gypsum by low temperature heat-treatment. The properties of calcined gypsum reached the best as calcining FGD gypsum at 170 degrees C for 2 h. Potassium sodium tartrate and aluminum sulfate were employed as composite crystal modifiers to improve the property of calcined gypsum, and calcium oxide was used to adjust pH value of the system to 12. The effects of the different ratios and dosages of composite crystal modifiers on the properties of the calcined gypsum were investigated, and the modified mechanism was revealed. The results show that the lattice integrity and symmetry of calcined gypsum undergo noticeable alterations upon adding the composite crystal modifiers. As the composite ratio of potassium sodium tartrate to aluminum sulfate increases, more lattice defects appear in the calcined gypsum. Moreover, the higher proportion of aluminum sulfate promotes the elongation of fibrous dihydrate gypsum (DH), while the increased proportion of potassium sodium tartrate gradually makes DH crystals transform from fibrous into flaky. When the composite ratio is 1:10 with the dosage of 0.33 % by mass of FGD gypsum, the hydration product (DH) of the prepared calcined gypsum displays dense structure with the interlaced columnar or fibrous crystals. The 2 h flexural and compressive strength reach 3.6 and 10.3 MPa, and the dried flexural and compressive strength increase to 7.2 and 21 MPa, respectively, meeting the standard requirement of grade 3.0 calcined gypsum.
关键词	FGD gypsum Composite crystal modifiers Calcined gypsum Aluminum sulfate Potassium sodium tartrate
资助者	Basic Research Project of Shanxi Province
DOI	10.1016/j.conbuildmat.2024.138609
收录类别	SCI
语种	英语
资助项目	Basic Research Project of Shanxi Province[202203021211186]
WOS研究方向	Construction & Building Technology ; Engineering ; Materials Science
WOS类目	Construction & Building Technology ; Engineering, Civil ; Materials Science, Multidisciplinary
WOS记录号	WOS:001333775100001
出版者	ELSEVIER SCI LTD
引用统计
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/190599
专题	中国科学院金属研究所
通讯作者	Hao, Jianying; Zhu, Zhenguo
作者单位	1.Taiyuan Univ Sci & Technol, Sch Mat Sci & Engn, Taiyuan 030024, Peoples R China 2.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Wang, Shengchang,Hao, Jianying,Zhu, Zhenguo,et al. Effect of composite ratio of composite crystal modifiers on the properties of calcined gypsum[J]. CONSTRUCTION AND BUILDING MATERIALS,2024,450:8.
APA	Wang, Shengchang,Hao, Jianying,Zhu, Zhenguo,Chen, Jianing,&Tian, Bo.(2024).Effect of composite ratio of composite crystal modifiers on the properties of calcined gypsum.CONSTRUCTION AND BUILDING MATERIALS,450,8.
MLA	Wang, Shengchang,et al."Effect of composite ratio of composite crystal modifiers on the properties of calcined gypsum".CONSTRUCTION AND BUILDING MATERIALS 450(2024):8.