Sewage sludge ash: A comparative evaluation with fly ash for potential use as lime-pozzolan binders

doi:10.1016/j.conbuildmat.2020.118160

	Sewage sludge ash: A comparative evaluation with fly ash for potential use as lime-pozzolan binders
	Zhou, Yi-fan 2; Li, Jiang-shan 2,3; Lu, Jian-xin 2; Cheeseman, Chris 1; Poon, Chi Sun 2
刊名	CONSTRUCTION AND BUILDING MATERIALS
	2020-05-10
卷号	242 页码:10
关键词	Finely-ground sewage sludge ash (FSSA) Fly ash (FA) Lime-pozzolan Hydration Construction material Waste management
ISSN号	0950-0618
DOI	10.1016/j.conbuildmat.2020.118160
英文摘要	The disposal of sewage sludge ash (SSA) has become an environmental issue due to the limited available landfill space. This study aims at applying the finely-ground sewage sludge ash (FSSA) with quicklime and hydrated lime to develop a new type of lime-pozzolan system and study the effects of different types of lime on the mechanical properties of the systems. A traditional pozzolanic material (i.e. coal fly ash (FA)) was also used to compare with the FSSA. Multiple techniques including X-ray diffraction (XRD), scanning electron microscopy (SEM) and thermogravimetric analysis (TGA) were used to assess the hydration kinetics and microscopic characteristics of the lime-pozzolan systems. The results showed that the quicklime system exhibited lower strength than the hydrated lime system, which was due to its lower reaction degree with the FSSA and the higher porosity caused by the expansion during the vigorous hydration reaction of quicklime. Compared to FA, the FSSA attained higher strength for the whole curing period (up to 90 d) in the lime system due to the highly porous nature of FSSA leading to a lower effective water to binder ratio. However, in the hydrated lime system, due to the higher overall pozzolanic activity of FA, its long-term strength values gradually improved. Besides, calcium phosphate hydrate crystals were detected by XRD in the FSSA; while some clinotobermorite was found in the FA both from XRD and SEM, which might govern the strength gain in the lime-FA system. Overall, the application of FSSA as a pozzolan in the lime-pozzolan system could be a promising option to both relieve the waste disposal pressure and provide a potential sustainable construction material. (C) 2020 Elsevier Ltd. All rights reserved.
资助项目	Hong Kong Government 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:000527388800069
内容类型	期刊论文
源URL	[http://119.78.100.198/handle/2S6PX9GI/24193]
专题	中科院武汉岩土力学所
通讯作者	Poon, Chi Sun
作者单位	1.Imperial Coll London, Dept Civil & Environm Engn, London SW7 2AZ, England 2.Hong Kong Polytech Univ, Dept Civil & Environm Engn, Hung Hom, Kowloon, Hong Kong, Peoples R China 3.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, Yi-fan,Li, Jiang-shan,Lu, Jian-xin,et al. Sewage sludge ash: A comparative evaluation with fly ash for potential use as lime-pozzolan binders[J]. CONSTRUCTION AND BUILDING MATERIALS,2020,242:10.
APA	Zhou, Yi-fan,Li, Jiang-shan,Lu, Jian-xin,Cheeseman, Chris,&Poon, Chi Sun.(2020).Sewage sludge ash: A comparative evaluation with fly ash for potential use as lime-pozzolan binders.CONSTRUCTION AND BUILDING MATERIALS,242,10.
MLA	Zhou, Yi-fan,et al."Sewage sludge ash: A comparative evaluation with fly ash for potential use as lime-pozzolan binders".CONSTRUCTION AND BUILDING MATERIALS 242(2020):10.