Tools, Equipment & Safety Procedures Flashcards

What is the primary function of a concrete edger tool?

Answer: Create a rounded, finished edge along forms

An edger is run along form edges to create a smooth, rounded profile that resists chipping when forms are stripped.

Lockout/tagout (LOTO) procedures must be followed when:

Answer: Servicing or cleaning equipment with potential stored energy

LOTO is required before any servicing or maintenance to prevent unexpected energization of equipment.

Which screed type uses mechanical vibration to consolidate concrete while striking it off to grade?

Answer: Vibratory screed

A vibratory screed combines a strike-off action with vibration to consolidate concrete and produce a uniform surface.

What hazard is associated with operating power finishing equipment near electrical conduit embedded in a slab?

Answer: Electrocution if conduit is nicked and energized

Cutting into energized embedded conduit with metal trowel blades creates a serious electrocution hazard.

A groover (jointing tool) is used to:

Answer: Create a weakened plane that controls crack location

A groover cuts a groove into fresh concrete to create a weakened plane where shrinkage cracks will occur in a controlled location.

When must a concrete finisher wear chemical-resistant gloves and boots?

Answer: Whenever in prolonged contact with fresh concrete

Fresh concrete is highly alkaline and prolonged skin contact causes chemical burns; protective gloves and boots are required.

What is the recommended insertion spacing for an internal vibrator to ensure full consolidation?

Answer: 1.5 times the vibrator's radius of action

ACI 309R recommends spacing vibrator insertions at 1.5 times the radius of action to ensure overlapping consolidation coverage.