Influence of seawater on the mechanical and microstructural properties of lime-incineration sewage sludge ash pastes

doi:10.1016/j.conbuildmat.2021.122364

	Influence of seawater on the mechanical and microstructural properties of lime-incineration sewage sludge ash pastes
	Zhou, Yifan 1; Lu, Jianxin 1; Li, Jiangshan 3,4; Cheeseman, Chris 2; Poon, Chi Sun 1,3
刊名	CONSTRUCTION AND BUILDING MATERIALS
	2021-04-05
卷号	278 页码:9
关键词	Seawater Hydrated lime Sewage sludge ash Pore size distribution Microstructure Compressive strength
ISSN号	0950-0618
DOI	10.1016/j.conbuildmat.2021.122364
英文摘要	Traditional disposal methods of dredged marine sediment are expensive and environmentally harmful. Reusing marine sediment as construction materials by stabilisation/solidification (S/S) has been an appealing option. This paper reports on a study on evaluating the potential of using incineration sewage sludge ash (SSA) as the principal binder together with anhydrous lime and hydrated lime for S/S in a seawater environment. This study evaluated the effects of seawater on the mechanical performance and microstructural properties of the binder as compared to the use of freshwater. Generally, seawater accelerated and promoted the strength development of the lime-SSA binder. Friedel's salts (3CaO center dot Al2O3 center dot CaCl2 center dot 10H(2)O) were detected in the seawater pastes by X-ray diffraction (XRD) and thermogravimetric (TG) analysis. It was found that the role of Friedel's salt contributed differently to the strength development of hydrated lime (CH)-SSA and anhydrous lime (lime)-SSA pastes mixed with seawater particularly at the later curing age. The 28-day strength of the lime-SSA paste mixed with seawater wasmore than double that of mixed with freshwater, whereas the CH-SSA paste mixed with seawater only showed a comparable 28-day strength with the freshwater mix. This was primarily due to the initial porous structure of the fresh lime-SSA paste allowing the growth of the Friedel's salts. Therefore, the use of anhydrous lime may mitigate the strength reduction caused by Friedel's salts at the later ages. (C) 2021 Elsevier Ltd. All rights reserved.
资助项目	Research Grants Council's Hong Kong PhD Fellowship Scheme ; National Natural Science Foundation of China/Hong Kong Research Grants Council Joint Research Scheme[N_PolyU511/18]
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:000634540000030
内容类型	期刊论文
源URL	[http://119.78.100.198/handle/2S6PX9GI/26002]
专题	中科院武汉岩土力学所
通讯作者	Poon, Chi Sun
作者单位	1.Hong Kong Polytech Univ, Dept Civil & Environm Engn, Hung Hom, Kowloon, Hong Kong, Peoples R China 2.Imperial Coll London, Dept Civil & Environm Engn, London SW7 2AZ, England 3.IRSM CAS HK PolyU Joint Lab Solid Waste Sci, Hung Hom, Kowloon, Hong Kong, Peoples R China 4.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Peoples R China
推荐引用方式 GB/T 7714	Zhou, Yifan,Lu, Jianxin,Li, Jiangshan,et al. Influence of seawater on the mechanical and microstructural properties of lime-incineration sewage sludge ash pastes[J]. CONSTRUCTION AND BUILDING MATERIALS,2021,278:9.
APA	Zhou, Yifan,Lu, Jianxin,Li, Jiangshan,Cheeseman, Chris,&Poon, Chi Sun.(2021).Influence of seawater on the mechanical and microstructural properties of lime-incineration sewage sludge ash pastes.CONSTRUCTION AND BUILDING MATERIALS,278,9.
MLA	Zhou, Yifan,et al."Influence of seawater on the mechanical and microstructural properties of lime-incineration sewage sludge ash pastes".CONSTRUCTION AND BUILDING MATERIALS 278(2021):9.