Building Construction Chapter 10

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What is concrete the hardened form of?

Only portland cement
Portland cement, coarse and fine aggregates, and water (correct)
Only fine aggregates
Only coarse aggregates

What do aggregates contribute to in concrete?

A large percentage of the total volume (correct)
The color of the concrete
The strength of the concrete
A small percentage of the total volume

What is the purpose of superplasticizers in concrete?

Reduce the strength of the concrete
Improve the color of the concrete
Increase the density of concrete
Produce a mixture that flows more freely (correct)

What is the ultimate compressive strength range of concrete?

2,500 to 6,000 psi (D) Signup and view all the answers

Which property makes concrete suitable for mild to moderate fire conditions?

Good insulating properties (B) Signup and view all the answers

Which type of stress is concrete strong in?

Compression (A) Signup and view all the answers

What is the purpose of stirrups in concrete beams?

To resist diagonal tension (C) Signup and view all the answers

How is prestressed concrete different from ordinary reinforced concrete?

It has stress introduced before the load is applied (B) Signup and view all the answers

What happens in pretensioned reinforcement?

Steel strands are stretched between anchors producing tensile force (A) Signup and view all the answers

What is the main difference between pretensioned and posttensioned reinforcement?

Pretensioned reinforcement applies force to the steel before the concrete hardens, while posttensioned reinforcement applies force after the concrete has hardened (A) Signup and view all the answers

What happens if posttensioned elements are released?

They may lead to failure of the concrete structural element resulting in partial or total collapse (A) Signup and view all the answers

What is the purpose of steel strands in pretensioned reinforcement?

To produce a tensile force in the steel before pouring concrete (C) Signup and view all the answers

What is the most important factor in determining the ultimate strength of concrete?

Water-to-cement ratio (C) Signup and view all the answers

At what temperature range must concrete in the process of curing be maintained?

Between 50°F and 70°F (D) Signup and view all the answers

How is precast concrete different from cast-in-place concrete?

Precast is cured at a plant and hauled to the job site, while cast-in-place is placed into forms at the job site. (D) Signup and view all the answers

What is the purpose of the slump test in concrete?

Checks moisture content of concrete (C) Signup and view all the answers

What is a factor affecting the fire resistance of concrete structural systems?

Supported load (A) Signup and view all the answers

What can compromise the fire resistance in concrete assemblies?

Non-resistive members supporting concrete floor slabs or wall panels (B) Signup and view all the answers

What is the primary cause of spalling in concrete?

Expansion of moisture within concrete (B) Signup and view all the answers

What is the main advantage of using precast concrete?

Higher degree of quality control (C) Signup and view all the answers

Which type of construction is best suited for buildings with light floor loads?

Slab and beam frame (A) Signup and view all the answers

What is the major disadvantage of using precast concrete?

Need to transport finished components to the jobsite (B) Signup and view all the answers

What type of precast slab is suitable for short spans up to approximately 30 feet?

Solid slab (B) Signup and view all the answers

In tilt-up construction, how are reinforced wall panels positioned into a vertical position?

A crane tilts the walls into a vertical position (B) Signup and view all the answers

What is concrete?

The hardened form of Portland cement, coarse and fine aggregates, and water.

What do aggregates contribute to in concrete?

They contribute a large percentage of the total volume in concrete.