CPC CPC Construction Methods & Materials

Question 1

Which concrete curing method involves covering freshly placed concrete with wet burlap or curing blankets?

Accepted Answer

Wet curing

Answer

Wet curing keeps concrete moist by covering it with water-saturated materials like burlap, promoting proper hydration.

Question 2

What is the primary purpose of adding fly ash as a supplementary cementitious material in concrete?

Accepted Answer

Reduce water demand and improve long-term durability

Answer

Fly ash reduces water demand, improves workability, and enhances long-term durability and resistance to sulfate attack.

Question 3

In steel construction, what does the term 'camber' refer to?

Accepted Answer

Intentional upward curvature built into a beam

Answer

Camber is a deliberate upward curve built into a beam so that under load it deflects back to a level position.

Question 4

Which masonry unit is classified as a hollow unit under ASTM standards?

Accepted Answer

Concrete masonry unit with core area > 25% of gross area

Answer

ASTM C90 defines a hollow CMU as one whose net cross-sectional area in any plane is less than 75% of its gross cross-sectional area.

Question 5

What is the standard slump range for normal structural concrete used in columns and walls?

Accepted Answer

2–4 inches

Answer

Normal structural concrete for columns and walls typically requires a slump of 2–4 inches to balance workability with strength.

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