Silica Exposure
Construction workers are potentially exposed to hazardous dust containing respirable crystalline silica (RCS) when using jackhammers to break concrete pavement.
Two methods for controlling respirable crystalline silica dust when using jackhammers or powered chipping tools: vacuum dust collection systems and wet methods.
- Vacuum Dust Collection System (VDCS): Employers may use commercially available VDCSs for jackhammers and handheld powered chipping tools to reduce silica exposure.
Worker using jack hammer with a Vacuum Dust Collection System (VDCS) to protect against silica exposure.
- Wet methods: When jackhammering, wetting must occur with a continuous stream or spray of water at the point where the jackhammer’s tip strikes the surface material. Employers may use manual spraying or water- spray systems. Under either approach, water must be applied at a flow rate sufficient to minimize the release of visible dust.
NIOSH found such exposures could be reduced by using a water-spray attachment. This low-flow, water-spray control suppressed and reduced dust exposures by 70%-90%. (Source: NIOSH)
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5-10. What can reduce respirable crystalline silica (RCS)?
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