CPII Material Testing 5

Question 1

Which ASTM standard covers the Standard Specification for Concrete Aggregates?

Accepted Answer

ASTM C 33

Answer

ASTM C 33 specifies requirements for fine and coarse aggregates for use in portland cement concrete.

Question 2

A compaction test result shows 94% relative compaction. The project specification requires 95%. What should the inspector do?

Accepted Answer

Require the contractor to recompact and retest the failing area

Answer

When a compaction test fails specification requirements, the contractor must recompact the failing area and pass a retest before work can proceed.

Question 3

What characteristic does the California Bearing Ratio (CBR) test measure?

Accepted Answer

The load-bearing strength of subgrade relative to a standard crushed rock

Answer

CBR measures the load-bearing capacity of a subgrade soil by comparing the force required to penetrate it with the force required to penetrate standard crushed California limestone.

Question 4

Viscosity grading of asphalt binders was largely replaced by which modern grading system?

Accepted Answer

Superpave Performance Grading (PG) system

Answer

The Superpave Performance Grading system replaced AC and AR viscosity grades, specifying asphalt binder performance over the actual temperature range at the project location.

Question 5

What does a 'plastic limit' value represent in soil classification?

Accepted Answer

The moisture content below which soil crumbles when rolled into 1/8-inch threads

Answer

The plastic limit is the moisture content below which a soil behaves as a semi-solid and crumbles when attempting to roll it into 1/8-inch diameter threads.

(CPII) Certified Public Infrastructure Inspector Practice Test

(CPII) Certified Public Infrastructure Inspector Practice Test

CPII Material Testing 5