BC Chapter 10

Question 1

Admixtures such as ____________ produce a concrete mixture that flows more freely.

p. 258

Answer 1

Superplasticizers

Question 2

The primary advantages of concrete include:

(4)

p. 258

Answer 2

• Low cost and locally available
• Noncombustible
• Performs well under fire conditions
• Good insulating properties

Question 3

The compressive stength of concrete can range from ________ psi to ________pst.

p. 259

Answer 3

2,500psi to 6,000

Question 4

Vertical reinforcing bars in concrete are called:

p. 260

Answer 4

Stirrups

Question 5

Prestressing is a more efficient use of concrete compared to reinforced concrete.

Two common methods of prestressing are:

p. 261

Answer 5

Pretensioning

Posttensioning

Question 6

During the hardening of concrete, heat is given off by a chemical reaction. This is called:

p.264

Answer 6

Heat of Hydration

Question 7

Concrete construction framework that uses reinforcing steel placed on the bottom of the framework that provides reinforcment in two directions.

Two names:

p. 268

Answer 7

Two-way Slab Construction

and

Waffle construction

Question 8

Four different precast concrete slab shapes:

p. 270

Answer 8

• Solid slab
• Hollow core slab
• Single Tee Slab
• Double Tee Slab

Question 9

Solid precast slabs are used for short spans up to _____ feet.

While Double Tee slabs can span up to _____ feet.

p. 270

Answer 9

30 feet

120 feet