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

A standard modular brick measures 3-5/8 inches wide × 2-1/4 inches tall × 7-5/8 inches long, which equals 4" × 2-2/3" × 8" with mortar joints.

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

Control joints create weakened planes in concrete slabs that guide shrinkage cracking to occur at planned locations rather than randomly across the slab.

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

ACI 318 requires a minimum of 1-1/2 inches of concrete cover over reinforcing steel in slabs exposed to weather to protect against corrosion.

Question 4

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

Accepted Answer

Type M or S

Answer

ASTM C270 specifies Type M or Type S mortar for load-bearing and below-grade masonry due to their higher compressive strengths.

Question 5

What is 'admixture' in concrete mix design?

Accepted Answer

A material added to concrete to modify its properties

Answer

Admixtures are materials added to concrete in small quantities to modify properties like workability, setting time, air content, or durability.

Construction Practice Test

Construction Practice Test

Construction Concrete and Masonry 2