Tools, Equipment & Safety Procedures Flashcards

Which type of float is used to bring moisture and fine particles to the surface during the first finishing pass?

Answer: Bull float

A bull float is used immediately after screeding to embed aggregate and bring a thin layer of cement paste to the surface.

What personal protective equipment is required when cutting concrete with a dry-cut saw?

Answer: Respirator, eye protection, and hearing protection

Dry-cut concrete sawing generates silica dust and extreme noise, requiring respiratory, eye, and hearing protection.

A power trowel blade set at a high positive pitch angle will produce what effect?

Answer: A burnished, hard surface finish

Increasing the blade pitch angle on a power trowel creates more friction and pressure, resulting in a denser, burnished surface.

What is the purpose of a concrete vibrator during placement?

Answer: To consolidate concrete and remove entrapped air

Internal vibrators consolidate fresh concrete by eliminating air voids, improving strength and bond with reinforcement.

Which OSHA standard specifically governs silica dust exposure limits for construction workers?

Answer: 29 CFR 1926.1153

OSHA 29 CFR 1926.1153 sets the permissible exposure limit (PEL) for respirable crystalline silica in construction.

When using a laser screed, what does the rotating laser do?

Answer: Establishes a reference elevation plane for automatic grade control

The rotating laser transmits a level reference plane that the screed's receiver uses to automatically control grade.

Before operating a ride-on power trowel, a finisher should inspect all of the following EXCEPT:

Answer: Slab mix design water-cement ratio

Water-cement ratio is a batch plant concern; pre-operation equipment inspection covers oil, blades, and safety guards.