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In-Depth Survey Report: Control of Silica Exposure in Construction Scabbling Concrete at Frank Messer and Sons Construction Company, Hebron, Kentucky
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2002/04/01
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[PDF-270.98 KB]
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Description:Scabbling concrete involves dressing the surface of the concrete to remove surface imperfections or surface coatings. Analysis of a novel control designed and constructed by the site superintendent for use with a small, gasoline-powered, walk-behind scabbler showed that it was effective at reducing employee exposure to respirable dust and, should also be effective in reducing exposure to crystalline silica. The control consisted of a 15-inch spray bar made from 3/4-inch schedule 40 polyvinyl chloride pipe with 15 slots cut in it spaced 3/4 to I-inch apart. The spray bar was attached to a lifting handle on the front of the scabbler with hose clamps, and oriented with the slots facing downward, toward the work surface. An elbow connected the spray bar to a length of flexible hose mounted on the upright of the handle of the scabbler, with a valve mounted about midway down the handle. The hose mounted on the scabbler was fitted with a standard garden hose fitting to allow it to be connected to a water supply hose. An 80% reduction in mean exposure levels of respirable dust was found with the use of the water control, from 3.88 mg/m3 to 0.64 mg/m3. This difference was statistically significant at the p=0.05 level. The difference was detected with 50% power in the 10 pairs of samples using a standard two-group t-test for equality of means.
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DOI:10.26616/NIOSHEPHB24715d
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Pages in Document:1-10
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NIOSHTIC Number:20022239
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NTIS Accession Number:PB2003-102265
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Citation:Cincinnati, OH: U.S. Department of Health and Human Services, Public Health Service, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, EPHB 247-15d, 2002 Apr; :1-10
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Federal Fiscal Year:2002
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Peer Reviewed:False
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Resource Number:EPHB-247-15d
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