DOI: 10.1016/j.atmosenv.2018.01.033
Scopus记录号: 2-s2.0-85041479017
论文题名: Mercury release from fly ashes and hydrated fly ash cement pastes
作者: Du W ; , Zhang C ; -Y ; , Kong X ; -M ; , Zhuo Y ; -Q ; , Zhu Z ; -W
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2018
卷: 178 起始页码: 11
结束页码: 18
语种: 英语
英文关键词: Cement
; Concrete
; Fly ash
; Mercury
; Release
Scopus关键词: Cements
; Coal
; Concretes
; Fly ash
; Fossil fuel power plants
; Hydration
; Mercury (metal)
; Portland cement
; Secondary emission
; Cement and concretes
; Coal-fired power plant
; Fly ash cement paste
; Hydrated cement pastes
; Immobilization effects
; Increasing temperatures
; Ordinary Portland cement
; Release
; Coal ash
; cement
; mercury
; Article
; crystal
; environmental temperature
; evaporation
; fly ash
; hydration
; immobilization
; moisture
; nonhuman
; particle size
; paste
; priority journal
; room temperature
; scanning electron microscopy
; surface area
; surface property
; temperature sensitivity
; X ray diffraction
Scopus学科分类: Environmental Science: Water Science and Technology
; Earth and Planetary Sciences: Earth-Surface Processes
; Environmental Science: Environmental Chemistry
英文摘要: The large-scale usage of fly ash in cement and concrete introduces mercury (Hg) into concrete structures and a risk of secondary emission of Hg from the structures during long-term service was evaluated. Three fly ashes were collected from coal-fired power plants and three blend cements were prepared by mixing Ordinary Portland cement (OPC) with the same amount of fly ash. The releasing behaviors of Hg0 from the fly ash and the powdered hydrated cement pastes (HCP) were measured by a self-developed Hg measurement system, where an air-blowing part and Hg collection part were involved. The Hg release of fly ashes at room temperature varied from 25.84 to 39.69 ng/g fly ash during 90-days period of air-blowing experiment. In contrast, the Hg release of the HCPs were in a range of 8.51–18.48 ng/g HCP. It is found that the Hg release ratios of HCPs were almost the same as those of the pure fly ashes, suggesting that the hydration products of the HCP have little immobilization effect on Hg0. Increasing temperature and moisture content markedly promote the Hg release. © 2018
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/82948
Appears in Collections: 气候变化事实与影响
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作者单位: Key Laboratory of Safety and Durability of China Education Ministry, Department of Civil Engineering, Tsinghua University, Beijing, China; Key Laboratory of Thermal Science and Power Engineering of China Education Ministry, Department of Energy and Power Engineering, Tsinghua University, Beijing, China
Recommended Citation:
Du W,, Zhang C,-Y,et al. Mercury release from fly ashes and hydrated fly ash cement pastes[J]. Atmospheric Environment,2018-01-01,178