Task-specific noise exposure during manual concrete surface grinding in enclosed areas - influence of operation variables and dust control methods

Details

• Personal Author:
  Akbar-Khanzadeh F ; Akbar-Khanzadeh M ; Ames AL ; Milz SA
• Description:
  Noise exposure is a distinct hazard during hand-held concrete grinding activities, and its assessment is challenging because of the many variables involved. Noise dosimeters were used to examine the extent of personal noise exposure while concrete grinding was performed with a variety of grinder sizes, types, accessories, and available dust control methods. Noise monitoring was conducted in an enclosed area covering 52 task-specific grinding sessions lasting from 6 to 72 minutes. Noise levels, either in minute average noise level (Lavg, dBA) or in minute peak (dBC), during concrete grinding were significantly (P < 0.01) correlated with general ventilation (GV: on, off), dust control methods (uncontrolled, wet, Shop-Vac, HEPA, HEPA-Cyclone), grinding cup wheel (blade) sizes of 4-inch (100 mm), 5-inch (125 mm) and 6-inch (150 mm), and surface orientation (horizontal, inclined). Overall, minute Lavg during grinding was 97.0 +/- 3.3 (mean +/- SD), ranging from 87.9 to 113. The levels of minute Lavg during uncontrolled grinding (98.9 +/- 5.2) or wet-grinding (98.5 +/- 2.7) were significantly higher than those during local exhaust ventilation (LEV) grinding (96.2 +/- 2.8). A 6-inch grinding cup wheel generated significantly higher noise levels (98.7 +/- 2.8) than 5-inch (96.3 +/- 3.2) or 4-inch (95.3 +/- 3.5) cup wheels. The minute peak noise levels (dBC) during grinding was 113 +/- 5.2 ranging from 104 to 153. The minute peak noise levels during uncontrolled grinding (119 +/- 10.2) were significantly higher than those during wet-grinding (115 +/- 4.5) and LEVgrinding (112 +/- 3.4). A 6-inch grinding cup wheel generated significantly higher minute peak noise levels (115 +/- 5.3) than 5-inch (112+/-4.5) or 4-inch (111+/-5.4) cup wheels. Assuming an 8-hour work shift, the results indicated that noise exposure levels during concrete grinding in enclosed areas exceeded the recommended permissible exposure limits and workers should be protected by engineering control methods, safe work practices, and/or personal protective devices. [Description provided by NIOSH]
• Subjects:
  Construction Industry Dust Environmental Health Environmental Monitoring Noise Occupational Health Radiation Dosimeters Safety
• Keywords:
  Author Keywords: Concrete Grinding Concretes Construction Construction-equipment Construction-industry Construction-workers Dosimetry Dust-control-equipment Enclosed Areas Environmental-factors Exposure-assessment Exposure-limits Grinding-equipment Hand-held Grinder Noise-analysis Noise-exposure Noise-levels Noise-measurement Noise Exposure Permissible-concentration-limits Task-performance

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• ISSN:
  1545-9624
• Document Type:
  Text
• Funding:
  Grant
• Genre:
  Journal Article
• Place as Subject:
  Ohio ; OSHA Region 5
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  478-486
• Volume:
  10
• Issue:
  9
• NIOSHTIC Number:
  nn:20043139
• Citation:
  J Occup Environ Hyg 2013 Sep; 10(9):478-486
• Contact Point Address:
  Farhang Akbar-Khanzadeh, University of Toledo Health Science Campus, College of Medicine, MS 1027, Department of Public Health & Preventive Medicine, 3000 Arlington Ave., Toledo, OH 43614
• Email:
  farhang.akbar@utoledo.edu
• Federal Fiscal Year:
  2013
• Performing Organization:
  University of Toledo
• Peer Reviewed:
  True
• Start Date:
  20070901
• Source Full Name:
  Journal of Occupational and Environmental Hygiene
• End Date:
  20090831
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:ae9785d65770178b4e9c3091c311b547162d5e21e7873c71d837465e2bf2503dbca9d58b4ea5d5317193853ed7293daa0bbe29a80e051c5a9898ee7065fb88dd
• Download URL:
  https://stacks.cdc.gov/view/cdc/195142/cdc_195142_DS1.pdf
• File Type:
  [PDF - 406.21 KB ]