ACI Tools, Equipment & Safety Procedures 2

Question 1

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

Accepted Answer

Bull float

Answer

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

Question 2

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

Accepted Answer

Respirator, eye protection, and hearing protection

Answer

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

Question 3

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

Accepted Answer

A burnished, hard surface finish

Answer

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

Question 4

What is the purpose of a concrete vibrator during placement?

Accepted Answer

To consolidate concrete and remove entrapped air

Answer

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

Question 5

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

Accepted Answer

29 CFR 1926.1153

Answer

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

(ACI) American Concrete Institute Concrete Finisher Practice Test