Noise exposure during hand-held concrete grinding - effects of dust control methods and grinder size.
Akbar-Khanzadeh-F; Milz-S; Wagner-C; Ames-A; Bisesi-M
American Industrial Hygiene Conference and Exposition, May 30 - June 4, 2009, Toronto, Canada. Fairfax, VA: American Industrial Hygiene Association, 2009 May; :33
Hand-held concrete grinding activities impose several distinct hazards on workers, including noise, silica dust, vibration, and ergonomics issues. Noise exposure assessment during these activities is challenging because of many confounders such as those related to tools/accessories, work surfaces and set up, and worker's position and work habits. This study used noise dosimeters (Spark 705+, Larsen Davis) to examine the extent of personal noise exposure while a concrete grinding worker used a variety of grinder sizes, types, and attachments, including available dust control methods. Noise monitoring was conducted in an indoor field laboratory located in a concrete cutting firm for nine days, covering 44 grinding sessions from 5 minutes to 60 minutes. The worker's minute-time-weighted average (dBA) exposure during grinding was 95.4 +/- 5.2 (mean +/- SD), ranging from 77.8 to 113.2. Background noise was 71.9 +/- 4.6, ranging from 58.5 to 82.7. The levels of noise exposure were different for three methods of dust control; traditional (no dust control) grinding created significantly higher noise levels (98.0 +/- 5.8) than those of wet grinding (96.7 +/- 5.1) or local exhaust grinding (93.5 +/- 4.4). The levels of noise exposure were also different for four sizes of grinding diamond cups (blade); 7-inch (17.8 cm) grinder cup generated significantly higher noise levels (97.9 +/- 4.7) than those of 5 inch (12.7 cm), with noise levels of 95.6 +/- 5.2, 4.5 inch (11.4 cm) with noise levels of 93.9 +/- 2.3, and 4 inch (10.2 cm) with noise levels of 91.8 +/- 5.2. There were no significant differences in the noise levels when grinding concrete in horizontal or inclined position or when the general ventilation in the shop was on or off. The results indicate that noise exposure levels during concrete grinding can exceed the recommended limits by ACGIH, and workers should be protected accordingly.
Exposure-assessment; Noise; Noise-exposure; Noise-measurement; Noise-sources; Dust-control; Dust-control-equipment
American Industrial Hygiene Conference and Exposition, May 30 - June 4, 2009, Toronto, Canada
University of Toledo