General Contractor License Site Work and Concrete 2

Question 1

What does the term 'slump' measure in fresh concrete?

Accepted Answer

Workability and consistency of the mix

Answer

Slump measures the workability and consistency of fresh concrete by how much a standard cone of concrete settles.

Question 2

Which type of retaining wall relies primarily on its own weight for stability?

Accepted Answer

Gravity wall

Answer

A gravity retaining wall resists lateral earth pressure through its own mass and weight without reinforcement.

Question 3

What is the minimum curing period for most structural concrete under normal temperature conditions?

Accepted Answer

7 days

Answer

A minimum of 7 days of continuous moist curing is required for most structural concrete to achieve adequate early strength.

Question 4

During grading operations, 'cut' refers to:

Accepted Answer

Excavating earth to lower an existing grade

Answer

Cut is the excavation of existing earth to reduce the elevation to a desired grade level.

Question 5

What additive is used in concrete to reduce the water-cement ratio while maintaining workability?

Accepted Answer

Water reducer (plasticizer)

Answer

Water reducers (plasticizers) allow a lower water-cement ratio while keeping the mix workable, improving strength and durability.

General Contractor License Practice Test