CPC CPC Construction Methods & Materials 2

Question 1

What does the water-cement (w/c) ratio primarily control in a concrete mix design?

Accepted Answer

Strength and durability

Answer

The w/c ratio is the single most important factor controlling concrete compressive strength and durability; lower ratios produce stronger, more durable concrete.

Question 2

In post-tensioned concrete construction, when are the tendons typically stressed?

Accepted Answer

After concrete has reached sufficient strength

Answer

Post-tensioning tendons are stressed after the concrete has cured and reached the required strength, typically around 75% of design strength.

Question 3

Which type of formwork system uses large prefabricated panels that can be reused many times on repetitive floor plates?

Accepted Answer

Flying form (table form) system

Answer

Flying forms (table forms) are large prefabricated assemblies that are flown by crane from floor to floor, reducing labor and increasing reuse cycles.

Question 4

What is the primary function of a vapor retarder placed under a concrete slab-on-grade?

Accepted Answer

Prevent moisture migration from soil into the slab

Answer

A vapor retarder placed beneath slabs-on-grade prevents ground moisture from migrating upward through the concrete, protecting floor coverings and equipment.

Question 5

In structural steel erection, what is the purpose of a 'safety cable' installed between columns?

Accepted Answer

Provide fall protection for ironworkers walking on beams

Answer

Safety cables (perimeter cables) are installed between columns to provide fall protection for ironworkers, as required by OSHA 1926 Subpart R.

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(CPC) Certified Professional Constructor Practice Test

CPC CPC Construction Methods & Materials 2