In-depth survey report: control of respirable dust and crystalline silica from breaking concrete with a jackhammer at Bishop Sanzari Companies, North Bergen, New Jersey, report no. CT-282-11a.
Echt-A; Sieber-K; Jones-E; Schill-DP; Lefkowitz-D; Sugar-J; Hoffner-K
NIOSH 2003 Feb; :1-17
Three different dust controls for use with jackhammers were evaluated. The objective of this study was to quantify the exposure reduction that could be achieved through the use of a water spray attachment and two different tool-mounted local exhaust ventilation shrouds during concrete pavement breaking with jackhammers. The effectiveness of the dust controls examined in this study was evaluated by measuring the reduction in the respirable dust exposure in the breathing zone of the construction worker when a dust control device was used compared to the exposure when no dust control device was used. Respirable dust exposure was measured in real time using a portable laser photometer. In addition, personal breathing zone samples were collected and analyzed using established NIOSH methods. Mean respirable dust concentrations when using water as a control were consistently statistically lower at the p<0.05 level from the means of all other types of controls, for both the personal breathing zone samples collected on filters and the real-time results. Use of water, applied using a solid cone nozzle at a flow rate of 350 mL of water per minute, also resulted in the greatest reduction in respirable dust concentration when compared with no control (72% for filter samples and 90% for real-time samples). Both local exhaust ventilation controls showed reductions in the 50 to 60% range. However, reductions using exhaust ventilation controls were not statistically significantly different from each other or from no control at the p<0.05 level due to the variability of the measurements made when exhaust ventilation controls were used.
Construction; Construction-equipment; Construction-materials; Construction-workers; Dust-control; Dusts; Control-technology; Exhaust-ventilation; Exposure-levels; Respirable-dust; Measurement-equipment; Region-2; Breathing-zone; Pneumatic-tools; Silica-dusts
Field Studies; Control Technology
NTIS Accession No.
Research Tools and Approaches: Control Technology and Personal Protective Equipment
National Institute for Occupational Safety and Health