CCI Construction Materials & Methods 3

Question 1

A concrete mix design calls for a water-to-cement (w/c) ratio of 0.45. If 400 lbs of cement is used per cubic yard, how much water (in lbs) is required?

Accepted Answer

180 lbs

Answer

Water weight = w/c ratio × cement weight = 0.45 × 400 = 180 lbs of water per cubic yard.

Question 2

Which type of pile is most appropriate when driving through soft soils to reach a hard bearing stratum?

Accepted Answer

End-bearing pile

Answer

End-bearing piles transfer structural loads through weak soils to a firm layer such as rock or dense gravel at the pile tip.

Question 3

In roofing, what does 'R-value' measure?

Accepted Answer

Thermal resistance of insulation

Answer

R-value is a measure of thermal resistance — the higher the R-value, the greater the insulating effectiveness of the material.

Question 4

What is the function of 'admixture' Type C (accelerator) in concrete?

Accepted Answer

Speeds up hydration to allow earlier form removal

Answer

Accelerating admixtures speed up the hydration of cement, increasing early strength gain and allowing earlier form stripping, especially useful in cold weather.

Question 5

When inspecting structural lumber, the designation 'No. 2 & Btr' means the lumber is:

Accepted Answer

No. 2 grade or higher quality

Answer

'No. 2 & Better' (No. 2 & Btr) means the lumber meets at least No. 2 grade standards and may include No. 1 or Select Structural grade material.

(CCI) Certified Construction Inspector Practice Test

(CCI) Certified Construction Inspector Practice Test

CCI Construction Materials & Methods 3