DOI: 10.1016/j.atmosenv.2014.03.035
Scopus记录号: 2-s2.0-84897093777
论文题名: Recycling concrete: An undiscovered source of ultrafine particles
作者: Kumar P ; , Morawska L
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2014
卷: 90 起始页码: 51
结束页码: 58
语种: 英语
英文关键词: Concrete waste recycling
; Construction and demolition
; Particle exposure mask
; Particle number exposure
; Particle size distribution
; Ultrafine particles
Scopus关键词: Concretes
; Dust
; Particle size analysis
; Respirators
; Concrete recycling
; Concrete wastes
; Construction and demolition
; Initial concentration
; Particle numbers
; Particle transformation
; Size-resolved particles
; Ultrafine particle
; Recycling
; concrete
; atmospheric pollution
; concentration (composition)
; concrete
; dilution
; dust
; emission
; particle size
; pollutant source
; pollution exposure
; recycling
; size distribution
; transformation
; urban pollution
; article
; concentration (parameters)
; dilution
; dispersion
; dust
; particle size
; particulate matter
; priority journal
; recycling
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: While concrete recycling is practiced worldwide, there are many unanswered questions in relation to ultrafine particle (UFP; Dp<100nm) emissions and exposure around recycling sites. In particular: (i) Does recycling produce UFPs and in what quantities? (ii) How do they disperse around the source? (iii) What impact does recycling have on ambient particle number concentrations (PNCs) and exposure? (iv) How effective are commonly used dust respirators to limit exposure? We measured size-resolved particles in the 5-560nm range at five distances between 0.15 and 15.15m that were generated by an experimentally simulated concrete recycling source and found that: (i) the size distributions were multimodal, with up to ~93% of total PNC in the UFP size range; and (ii) dilution was a key particle transformation mechanism. UFPs showed a much slower decay rate, requiring ~62% more distance to reach 10% of their initial concentration compared with their larger counterparts in the 100-560nm size range. Compared with typical urban exposure during car journeys, exposure decay profiles showed up to ~5 times higher respiratory deposition within 10m of the source. Dust respirators were found to remove half of total PNC; however the removal factor for UFPs was only ~57% of that observed in the 100-560nm size range. These findings highlight a need for developing an understanding of the nature of the particles as well as for better control measures to limit UFP exposure. © 2014 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/81097
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Civil and Environmental Engineering, Faculty of Engineering and Physical Sciences (FEPS), University of Surrey, Guildford GU2 7XH, United Kingdom; Environmental Flow (EnFlo) Research Centre, FEPS, University of Surrey, Guildford GU2 7XH, United Kingdom; International Laboratory for Air Quality and Health, Queensland University of Technology, GPO Box 2434, Brisbane QLD, 4001, Australia
Recommended Citation:
Kumar P,, Morawska L. Recycling concrete: An undiscovered source of ultrafine particles[J]. Atmospheric Environment,2014-01-01,90