CCI Construction Materials & Methods 2

Question 1

What is the primary purpose of using a vapor barrier in a concrete slab-on-grade?

Accepted Answer

To prevent moisture migration from the subgrade into the slab

Answer

To increase compressive strength

Answer

To reduce curing time

Answer

To improve surface finish

Question 2

Which masonry unit classification indicates the highest structural quality per ASTM C90?

Accepted Answer

Grade N

Answer

Type S

Answer

Grade MW

Answer

Type N

Question 3

In structural steel fabrication, what does the term 'mill scale' refer to?

Accepted Answer

Iron oxide layer formed on hot-rolled steel during manufacturing

Answer

A quality rating assigned at the rolling mill

Answer

The dimensional tolerance marking on structural members

Answer

A surface coating applied for corrosion protection

Question 4

What concrete admixture type is used to reduce the water content required to achieve a given slump?

Accepted Answer

Water reducer (plasticizer)

Answer

Accelerator

Answer

Air-entraining agent

Answer

Retarder

Question 5

When inspecting reinforcing steel, 'No. 5 bar' refers to a rebar with a nominal diameter of:

Accepted Answer

5/8 inch

Answer

3/8 inch

Answer

1/2 inch

Answer

3/4 inch

Question 6

Which type of Portland cement is specifically designed for use in environments with high sulfate exposure?

Accepted Answer

Type V

Answer

Type I

Answer

Type II

Answer

Type III

Question 7

What is the standard curing period recommended for normal-strength Portland cement concrete to achieve adequate strength?

Accepted Answer

28 days

Answer

3 days

Answer

7 days

Answer

14 days