CPII Materials & Testing 3

Question 1

Which test method is used to determine the air content of freshly mixed concrete by the pressure method?

Accepted Answer

ASTM C231

Answer

ASTM C231 covers the pressure meter method for measuring air content in freshly mixed concrete.

Question 2

A nuclear density gauge used for compaction testing must be operated under which federal agency's regulations?

Accepted Answer

NRC (Nuclear Regulatory Commission)

Answer

Nuclear gauges contain radioactive sources regulated by the NRC, requiring proper licensing and safety protocols.

Question 3

What does the term 'percent compaction' mean when field testing embankment materials?

Accepted Answer

The ratio of field dry density to maximum lab dry density times 100

Answer

Percent compaction is the field dry density divided by the maximum dry density from lab proctor testing, expressed as a percentage.

Question 4

Which reinforcing steel test verifies that the bar will bend without cracking?

Accepted Answer

Bend test

Answer

The bend test per ASTM A615 confirms reinforcing steel ductility by bending the bar around a pin without fracture.

Question 5

When performing a sieve analysis, what property of aggregate does the gradation curve represent?

Accepted Answer

Particle size distribution

Answer

A sieve analysis produces a gradation curve showing the distribution of aggregate particle sizes by percentage passing each sieve.

(CPII) Certified Public Infrastructure Inspector Practice Test