NASCLA Accredited Commercial General ContractorMasonryMedium
A masonry worker is cutting concrete blocks using a power saw. To minimize the risk of silicosis, a severe and irreversible lung disease, which of the following is the most effective safety measure to implement?
- AWorking in an enclosed area to contain dust particles.
- BUtilizing a wet cutting method with adequate ventilation.
- CWearing standard work gloves to protect hands from dust.
- DRelying solely on a dust mask for respiratory protection.
Show answer & explanationAnswer & explanation
Correct answer: B. Utilizing a wet cutting method with adequate ventilation.
Silica dust is generated when cutting concrete blocks. A wet cutting method suppresses dust at the source, preventing it from becoming airborne, and combined with adequate ventilation, it is the most effective way to protect workers from inhaling respirable crystalline silica.
Why the other options are wrong
- A. Working in an enclosed area without proper ventilation will concentrate dust, significantly increasing exposure risk.
- C. Standard work gloves protect hands but offer no protection against airborne silica dust inhalation.
- D. A standard dust mask (N95 or similar) provides some protection but is less effective than source control methods like wet cutting and should be used in conjunction with, not as a sole replacement for, engineering controls.
Silica Dust Control
Silica dust is fine crystalline silica particles generated during activities like cutting, grinding, or drilling concrete, brick, or stone, which can cause silicosis when inhaled.
- Wet cutting is a primary engineering control to suppress dust.
- Ventilation is crucial for removing airborne particles.
- Respirators are a secondary personal protective equipment (PPE) control.
Memory trick: Wet Works Wonders, Ventilate Vigorously, Wear When Necessary.