Using MgO activated slag and calcium bentonite slurry to produce a novel vertical barrier material: Performances and mechanisms

doi:10.1016/j.conbuildmat.2021.123365

	Using MgO activated slag and calcium bentonite slurry to produce a novel vertical barrier material: Performances and mechanisms
	Huang, Xiao 1,2; Li, Jiang-shan 1,2; Guo, Ming-zhi 3; Xue, Qiang 1,2; Du, Yan-jun 4; Wan, Yong 1,2; Liu, Lei 1,2; Poon, Chi Sun 2,5
刊名	CONSTRUCTION AND BUILDING MATERIALS
	2021-07-12
卷号	291 期号:-页码:15
关键词	MgO Ground granulated blast furnace slag Cutoff wall Unconfined compressive strength Permeability
ISSN号	0950-0618
DOI	10.1016/j.conbuildmat.2021.123365
英文摘要	Slag-cement-bentonite (SCB) slurry has been widely used for the construction of vertical cutoff walls to restrain the movement of groundwater at contaminated sites. However, the conventional cement-based slurry needs a long time to evolve satisfactory performance along with a relatively high environmental load. This paper proposes an innovative material for the self-hardening slurry system, consisting of reactive MgO, slag, bentonite and lots of water. The properties of fresh slurry, unconfined compressive strength (UCS) and permeability of the MgO activated slag and bentonite (MASB) slurry are investigated in comparison with SCB slurry. The results indicate that compared with SCB slurry, MASB slurry with appropriate proportions has comparative fresh properties, but possesses higher UCS and much lower hydraulic conductivity (close to 1.0 x 10(-10) m/s) at a later age. A massive formation of expansive hydration products (hydrotalcite phases) could satisfactorily fill in the voids of matrix, leading to a dense microstructure which is responsible for the excellent mechanical and penetrative performance of MASB slurry. The overall findings from this study well demonstrate that the developed MASB slurry holds great potential as a novel, eco-friendly and cost-effective material in the construction of vertical cutoff walls. (C) 2021 Elsevier Ltd. All rights reserved.
资助项目	National Key Research and Development Program[2019YFC1804002] ; National Science Fund for Distinguished Young Scholars[51625903] ; National Natural Science Foundation of China[42007260] ; University Grants Committee Joint Research Scheme[51861165104] ; Special Fund for Basic Research on Science Instruments of the National Science Foundation of China[51827814] ; CAS Pioneer Hundred Talents Program in China ; Youth Innovation Promotion Association CAS[2017376] ; National Natural Science Foundation of China/Hong Kong Research Grants Council
WOS研究方向	Construction & Building Technology ; Engineering ; Materials Science
语种	英语
出版者	ELSEVIER SCI LTD
WOS记录号	WOS:000660289200002
内容类型	期刊论文
源URL	[http://119.78.100.198/handle/2S6PX9GI/27506]
专题	中科院武汉岩土力学所
作者单位	1.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Peoples R China 2.IRSM CAS HK PolyU Joint Lab Solid Waste Sci, Wuhan 430071, Peoples R China 3.Hohai Univ, Coll Mech & Mat, Nanjing 210024, Peoples R China 4.Southeast Univ, Inst Geotech Engn, Jiangsu Key Lab Urban Underground Engn & Environm, Nanjing 211189, Peoples R China 5.Hong Kong Polytech Univ, Dept Civil & Environm Engn, Kowloon, Hong Kong, Peoples R China
推荐引用方式 GB/T 7714	Huang, Xiao,Li, Jiang-shan,Guo, Ming-zhi,et al. Using MgO activated slag and calcium bentonite slurry to produce a novel vertical barrier material: Performances and mechanisms[J]. CONSTRUCTION AND BUILDING MATERIALS,2021,291(-):15.
APA	Huang, Xiao.,Li, Jiang-shan.,Guo, Ming-zhi.,Xue, Qiang.,Du, Yan-jun.,...&Poon, Chi Sun.(2021).Using MgO activated slag and calcium bentonite slurry to produce a novel vertical barrier material: Performances and mechanisms.CONSTRUCTION AND BUILDING MATERIALS,291(-),15.
MLA	Huang, Xiao,et al."Using MgO activated slag and calcium bentonite slurry to produce a novel vertical barrier material: Performances and mechanisms".CONSTRUCTION AND BUILDING MATERIALS 291.-(2021):15.