Tools, Equipment & Safety Procedures Flashcards

Which condition indicates that a concrete surface is ready for final steel troweling?

Answer: The concrete leaves no mark when a finisher kneels on it

Final steel troweling begins when the concrete is firm enough to support a worker's weight without leaving more than a shallow footprint.

What is the purpose of knee boards used by concrete finishers?

Answer: Distribute body weight to work on soft concrete without sinking

Knee boards spread the finisher's weight over a larger area, allowing work on partially set concrete without leaving impressions.

When should a concrete finisher NOT begin hand-floating operations?

Answer: While bleed water is still present on the surface

Working bleed water into the surface weakens the concrete layer and causes dusting, scaling, or delamination.

A Fresno trowel differs from a standard hand trowel because it:

Answer: Is mounted on a long handle for use without bending

A Fresno trowel is a large steel trowel attached to a bull float handle, allowing finishers to trowel large slabs from a standing position.

What safety precaution is critical when refueling a gasoline-powered concrete saw?

Answer: Allow the engine to cool before refueling

Refueling a hot engine can ignite gasoline vapors; the engine must be shut off and cooled before adding fuel.

Which finishing tool leaves a coarser, slip-resistant texture suitable for exterior slabs?

Answer: Broom

A broom is dragged across the surface after floating to create a textured profile that improves traction on driveways, sidewalks, and patios.

Which PPE item is mandatory when operating a handheld concrete grinder?

Answer: Face shield, hearing protection, and dust respirator

Grinding generates flying debris, silica dust, and noise levels above 85 dB, requiring face, respiratory, and hearing protection.