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1	Control of silica exposure from hand tools in construction: grinding concrete
Authors	Echt-A; Sieber-WK
Source	Appl Occup Environ Hyg 2002 Jul; 17(7):457-461
Link	http://www.informaworld.com/smpp/content~content=a713832693
NIOSHTIC No.	20022288
Abstract	When construction workers use handheld grinders to smooth poured concrete surfaces after forms are stripped, they risk overexposure to respirable dust and crystalline silica. This article examines the performance of a local exhaust ventiliation system for handheld grinders. The system consisted of the grinder (equipped with a ventilated shroud), a length of flexible corrugated hose, and a portable electric vacuum cleaner that acted as the fan and dust collector for the ventilation system (see Figures 1 and 2). Personal breathing zone air samples for respirable dust and crystalline silica were collected during five days of grinding.
Keywords	Construction-workers; Workplace-studies; Concretes; Exposure-levels; Respirable-dust; Silica-dusts; Air-samples

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