Effect of direct carbonation routes of basic oxygen furnace slag (BOFS) on strength and hydration of blended cement paste

doi:10.1016/j.conbuildmat.2021.124628

	Effect of direct carbonation routes of basic oxygen furnace slag (BOFS) on strength and hydration of blended cement paste
	Ma, Mengting 1; Mehdizadeh, Hamideh 1; Guo, Ming-Zhi 2,3; Ling, Tung-Chai 1
刊名	CONSTRUCTION AND BUILDING MATERIALS
	2021-10-18
卷号	304 页码:10
关键词	Aqueous carbonation CO2 sequestration Basic oxygen furnace slag (BOFS) Calcium carbonate Blended cement paste
ISSN号	0950-0618
DOI	10.1016/j.conbuildmat.2021.124628
英文摘要	Mineral carbonation of alkali solid wastes is envisaged to be an effective method to sequester CO2 and turn the wastes into more valuable end products. Steel slag generated from the steel-making industry contains a high content of calcium oxide, which is a potential medium to sequestrate CO2 via the carbonation process. In this paper, the influence of reaction parameters including solid to liquid ratio, CO2 flow rate, temperature, volume of water and carbonation time on aqueous carbonation of basic oxygen furnace slag (BOFS) in maximizing CO2 sequestration was determined. The structural and mineralogical changes of carbonated BOFS were also analyzed using thermogravimetric analysis, X-ray diffraction, and scanning electron microscopy. Using an optimized aqueous carbonation condition, about 16.35% of CO2 can be sequestered, which was obviously higher compared with dry carbonation (about 4.91%) at ambient conditions. Subsequently, the effect of replacing cement with carbonated BOFS (either by aqueous or dry route) on the micro-mechanical properties and hydration characteristics of blended cement paste was studied. The results demonstrated that as a small ratio of aqueous carbonated BOFS (10%-20%) blended in the cement paste they can accelerate the rate of early heat evolution during the first 24 h. On the contrary, as the carbonated BOFS ratio increased, the overall heat of hydration and mechanical strength were decreased. In comparison, BOFS carbonated by aqueous method is found to perform better in blended cement paste than its counterpart carbonated by dry method at the same replacement ratio due to the presence of a greater calcite content (acting as nucleation sites) in the aqueous carbonated BOFS.
资助项目	National Natural Science Foundation of China (NSFC)[51950410584] ; National Natural Science Foundation of China (NSFC)[52078202] ; Opening Project of State Key Laboratory of Geomechanics and Geotechnical Engineering[Z020012] ; China Postdoctoral Science Foundation[2018M632219] ; Institute of Rock and Soil Mechanics, Chinese Academy of Sciences
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:000697478200004
内容类型	期刊论文
源URL	[http://119.78.100.198/handle/2S6PX9GI/27929]
专题	中科院武汉岩土力学所
通讯作者	Ling, Tung-Chai
作者单位	1.Hunan Univ, Coll Civil Engn, Changsha 410082, Hunan, Peoples R China 2.Hohai Univ, Coll Mech & Mat, Nanjing 210098, Jiangsu, 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	Ma, Mengting,Mehdizadeh, Hamideh,Guo, Ming-Zhi,et al. Effect of direct carbonation routes of basic oxygen furnace slag (BOFS) on strength and hydration of blended cement paste[J]. CONSTRUCTION AND BUILDING MATERIALS,2021,304:10.
APA	Ma, Mengting,Mehdizadeh, Hamideh,Guo, Ming-Zhi,&Ling, Tung-Chai.(2021).Effect of direct carbonation routes of basic oxygen furnace slag (BOFS) on strength and hydration of blended cement paste.CONSTRUCTION AND BUILDING MATERIALS,304,10.
MLA	Ma, Mengting,et al."Effect of direct carbonation routes of basic oxygen furnace slag (BOFS) on strength and hydration of blended cement paste".CONSTRUCTION AND BUILDING MATERIALS 304(2021):10.