干旱区生态环境知识资源中心(Arid): Use of Saline Water in Cemented Fine Tailings Backfill with One-Part Alkali-Activated Slag

Arid

DOI	10.1061/(ASCE)MT.1943-5533.0004612
	Use of Saline Water in Cemented Fine Tailings Backfill with One-Part Alkali-Activated Slag
	Zhu, Gengjie; Zhu, Wancheng; Hou, Chen; Jiang, Haiqiang
通讯作者	Zhu, WC
来源期刊	JOURNAL OF MATERIALS IN CIVIL ENGINEERING
ISSN	0899-1561
EISSN	1943-5533
出版年	2023
卷号	35 期号:3
英文摘要	To evaluate the feasibility of mixing saline underground water (SUW) in the preparation of cemented fine tailings backfill (CFTB), the compressive strength, pore fluid pH, slag hydration degree, hydration phase composition/structure, and pore morphology of CFTB have been tested. The binder used was a one-part alkali-activated slag composed of ground-granulated blast furnace slag (67.8% by weight) as precursor and desulfurized gypsum (25.9% by weight) and hydrated lime (6.3% by weight) as composite activator. The results showed that using SUW instead of deionized water as mixing medium had both negative and positive effects on the strength development of CFTB, depending on the curing time. At the very early ages (1-3 days), mixing SUW resulted in a decrease of the pore solution pH, which is due to the reaction of positive ions in SUW with OH- ions and the decrease of slag hydration rate, leading to a lower strength of CFTB. The positive effects were observed at the later ages (7-28 days). The higher later-age strength of SUW-mixed CFTB is attributed to two factors: (1) a smaller amount of ettringite (AFt) was generated at the very early ages, which reduced the encapsulation-hindering effect on the slag decomposition; and (2) SUW increased the slag hydration rate, promoting the condensation of calcium silicate hydrates, which results in increased formation of a calcium silicate aluminate hydrate [C-(A)-S-H] phase with rigid three-dimensional structure. These findings can provide important information for the use of SUW in CFTB in coastal and arid regions.
英文关键词	Cemented fine tailings backfill Saline underground water One-part alkali-activated slag Strength performance Microstructure
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000914207800022
WOS关键词	C-S-H ; BLAST-FURNACE SLAG ; HYDRATED PORTLAND CEMENTS ; TRICALCIUM SILICATE ; CALCIUM ; STRENGTH ; ALUMINUM ; SEAWATER ; MICROSTRUCTURE ; CONCRETE
WOS类目	Construction & Building Technology ; Engineering, Civil ; Materials Science, Multidisciplinary
WOS研究方向	Construction & Building Technology ; Engineering ; Materials Science
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/397477
推荐引用方式 GB/T 7714	Zhu, Gengjie,Zhu, Wancheng,Hou, Chen,et al. Use of Saline Water in Cemented Fine Tailings Backfill with One-Part Alkali-Activated Slag[J],2023,35(3).
APA	Zhu, Gengjie,Zhu, Wancheng,Hou, Chen,&Jiang, Haiqiang.(2023).Use of Saline Water in Cemented Fine Tailings Backfill with One-Part Alkali-Activated Slag.JOURNAL OF MATERIALS IN CIVIL ENGINEERING,35(3).
MLA	Zhu, Gengjie,et al."Use of Saline Water in Cemented Fine Tailings Backfill with One-Part Alkali-Activated Slag".JOURNAL OF MATERIALS IN CIVIL ENGINEERING 35.3(2023).