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Industrial Hygiene Survey of Respirable Crystalline Silica Dust Exposure in the Ready-Mixed Concrete Industry

机译:预拌混凝土行业可吸入结晶二氧化硅粉尘暴露的工业卫生学调查

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As part of the U.S. Department of Health and Human Services initiative, 'Health People 2000,' the National Institute for Occupational Safety and Health (NIOSH) is investigating respirable crystalline silica exposure in industries where silica is a constituent material. Ready-mix concrete was identified as an industry to investigate because of the potential for respirable crystalline silica exposure from the silica sand which comprises 10%-20% of concrete. The Occupational Safety and Health Administration's Integrated Management Information System (OSHA's IMIS) listed 64 instances of personal and/or area sampling for respirable silica dust at ready-mixed concrete plants (SIC' 3273) between September 1980 and December 1993. Fourteen (22%) were listed as measuring above the OSHA Permissible Exposure Limit (PEL) for respirable crystalline silica. The exposures measured ranged up to 7 times the PEL.

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