Effect of NaCl and MgCl2 on the hydration of lime-pozzolan blend by recycling sewage sludge ash

doi:10.1016/j.jclepro.2021.127759

	Effect of NaCl and MgCl2 on the hydration of lime-pozzolan blend by recycling sewage sludge ash
	Zhou, Yifan 1; Lu, Jianxin 1; Li, Jiangshan 2,3; Cheeseman, Chris 4; Poon, Chi Sun 1,3
刊名	JOURNAL OF CLEANER PRODUCTION
	2021-09-01
卷号	313 期号:-页码:11
关键词	Single salts Setting Hydration kinetics Strength Microstructure Acceleration
ISSN号	0959-6526
DOI	10.1016/j.jclepro.2021.127759
英文摘要	An extensive amount of work has focused on investigating the effects of seawater as mixing water on the mechanical properties and durability issues of cement pastes/mortars/concrete especially with steel rebars. However, limited information was available for the effects of seawater on the microstructural properties and compositions of blended cement systems. Sewage sludge ash has been widely studied as a supplementary cementitious material to manage wastes more sustainably and to relieve the environmental burden. Therefore, this paper investigated the mechanical properties as well as the microstructural findings of the lime-sewage sludge ash binder under the effects of the most dominant ion (i.e. Cl-) in seawater by mixing with NaCl and MgCl2 (major salts of seawater) solution respectively. The results reveal that as compared to the control, acceleration effects were remarkable in the NaCl mix and the total amount of heat evolved was increased by mixing with both single salts. The use of the concerned sea salts accelerated the setting and increased the compressive strength until curing for 28 days. But for the mix prepared with MgCl2, its strength was still significantly improved at 60 days. The formation of Friedel's salt in the mix prepared with NaCl was evidenced by X-ray diffraction and thermal gravimetry mainly due to the highest concentration of Cl- in NaCl. Also, the average pore diameter was decreased, and the finer fraction of pores was increased after the addition of NaCl and MgCl2, explaining their high strengths.
资助项目	Hong Kong PhD Fellowship Scheme (HKPFS) ; National Natural Science Foundation of China/Hong Kong Research Grants Council Joint Research Scheme[N_PolyU511/18]
WOS研究方向	Science & Technology - Other Topics ; Engineering ; Environmental Sciences & Ecology
语种	英语
出版者	ELSEVIER SCI LTD
WOS记录号	WOS:000681629800002
内容类型	期刊论文
源URL	[http://119.78.100.198/handle/2S6PX9GI/27636]
专题	中科院武汉岩土力学所
作者单位	1.Hong Kong Polytech Univ, Dept Civil & Environm Engn, Hung Hom, Kowloon, Hong Kong, Peoples R China 2.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Peoples R China 3.IRSM CAS HK PolyU Joint Lab Solid Waste Sci, Hung Hom, Kowloon, Hong Kong, Peoples R China 4.Imperial Coll London, Dept Civil & Environm Engn, London SW7 2BU, England
推荐引用方式 GB/T 7714	Zhou, Yifan,Lu, Jianxin,Li, Jiangshan,et al. Effect of NaCl and MgCl2 on the hydration of lime-pozzolan blend by recycling sewage sludge ash[J]. JOURNAL OF CLEANER PRODUCTION,2021,313(-):11.
APA	Zhou, Yifan,Lu, Jianxin,Li, Jiangshan,Cheeseman, Chris,&Poon, Chi Sun.(2021).Effect of NaCl and MgCl2 on the hydration of lime-pozzolan blend by recycling sewage sludge ash.JOURNAL OF CLEANER PRODUCTION,313(-),11.
MLA	Zhou, Yifan,et al."Effect of NaCl and MgCl2 on the hydration of lime-pozzolan blend by recycling sewage sludge ash".JOURNAL OF CLEANER PRODUCTION 313.-(2021):11.