General Contractor License Site Work and Concrete 3

Question 1

What is the purpose of control joints in a concrete slab?

Accepted Answer

To create planes of weakness that control cracking location

Answer

Control joints are tooled or sawn grooves that create intentional weak planes so that shrinkage cracks occur at planned locations.

Question 2

Soil classified as Type C under OSHA excavation standards is:

Accepted Answer

Granular or fissured soil with the highest risk of collapse

Answer

Type C is the least stable soil category under OSHA, including granular, fissured, or previously disturbed soils with the greatest collapse risk.

Question 3

The 'angle of repose' for soil refers to:

Accepted Answer

The maximum slope at which soil will remain stable without support

Answer

The angle of repose is the steepest slope at which a particular soil type will naturally stand without sliding or collapsing.

Question 4

Fly ash is commonly used as a partial replacement for Portland cement because it:

Accepted Answer

Improves workability and long-term strength while reducing cost

Answer

Fly ash is a pozzolan that improves workability, reduces heat of hydration, enhances long-term strength, and lowers material costs.

Question 5

What does 'dewatering' mean in the context of excavation work?

Accepted Answer

Removing groundwater from an excavation to keep it dry for construction

Answer

Dewatering is the process of pumping or draining groundwater from an excavation to create safe, workable dry conditions.

General Contractor License Practice Test