Safety, Standards, and Specifications
Core concepts
Know the safety hazards of concrete work: wet concrete is alkaline and can cause skin burns, so PPE (gloves, boots, eye protection) is essential; silica dust from cutting/sawing requires dust controls and respiratory protection; formwork and shoring failures, vibration exposure, and lifting hazards are common. Understand that specifications define acceptance criteria, tolerances, and responsibilities, and that standards (materials, testing, construction) provide the technical basis. Know the hierarchy: code/specification governs the project; referenced standards govern methods.
Traps
Questions test that wet concrete burns are a chemical (alkaline) hazard, not just abrasion, and that silica exposure comes from cutting/drilling, not from placing plastic concrete. A frequent trap is assuming a standard and a specification are interchangeable-specifications are project-specific and can be stricter. Watch for responsibility questions: the contractor typically controls means and methods, while the owner/engineer sets acceptance criteria. Also note that tolerances are not optional targets.
Worked example / rule of thumb
If a crew is saw-cutting hardened concrete, require wet cutting or dust collection plus respiratory protection-dry cutting without controls is a silica hazard. Rule of thumb: read the project specification first, then the referenced standards; when they conflict, the more stringent project requirement generally governs unless the spec states otherwise.