Construction Concrete and Masonry 2

Question 1

What is the standard size of a modular brick in the United States?

Accepted Answer

3-5/8" × 2-1/4" × 7-5/8"

Answer

3" × 2" × 8"

Answer

4" × 2-2/3" × 8"

Answer

3-1/2" × 2-1/2" × 7-1/2"

Question 2

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

Accepted Answer

To provide locations where cracking can occur in a controlled manner

Answer

To allow expansion due to heat

Answer

To accommodate pipe penetrations

Answer

To increase the slab's load capacity

Question 3

What is the minimum concrete cover required for rebar in a slab exposed to weather in the US?

Accepted Answer

1-1/2 inches

Answer

3/4 inch

Answer

2 inches

Answer

3 inches

Question 4

What is the correct mortar type for load-bearing masonry walls?

Accepted Answer

Type M or S

Answer

Type N

Answer

Type O

Answer

Type K

Question 5

What is 'admixture' in concrete mix design?

Accepted Answer

A material added to concrete to modify its properties

Answer

The aggregate portion of the mix

Answer

The type of cement used

Answer

Water added at the job site

Question 6

What is the purpose of air entrainment in concrete mixes used in freeze-thaw climates?

Accepted Answer

To create microscopic air bubbles that relieve freeze-thaw pressure

Answer

To increase compressive strength

Answer

To reduce the weight of concrete

Answer

To speed up curing time