Safety, Environmental, and Regulatory Requirements
Dry-mix shotcrete involves hazards that demand active controls. Silica dust from dry materials and rebound is a major respiratory hazard; use engineering controls such as wetting, ventilation, and dust collection, and wear appropriate respiratory protection. Cement is alkaline and can cause skin burns and eye injury; wear gloves, eye protection, and protective clothing, and wash exposed skin promptly. High-pressure air and water lines can whip or inject material; secure couplings, inspect hoses, and never point the nozzle at people. Rebound and airborne particles require face and body protection.
Noise, confined spaces, and working at height add risk. Follow confined-space entry procedures, use fall protection, and control access to the spray area. Environmental and regulatory considerations include managing rebound and waste, controlling runoff and dust emissions, and complying with local rules for silica exposure, disposal, and equipment. Understand that regulations vary by jurisdiction; the exam expects awareness of the hazard categories and the principle of controlling exposure at the source.
Traps: treating dust as a nuisance rather than a regulated hazard; neglecting skin protection; assuming high-pressure lines are safe if they look intact; ignoring confined-space or fall hazards.
Worked example / rule of thumb: control dust at the source first (wetting, ventilation, collection), then add PPE such as respiratory protection. Secure all pressurized connections and inspect hoses before pressurizing.