PIC Inspection Standards & Quality Control 2 — Questions and Answers
Question 1: When performing a mat density test using a nuclear gauge, the inspector must ensure the gauge is placed at least how far from any vertical obstruction?
- 6 inches
- 12 inches (Correct answer)
- 18 inches
- 24 inches
Correct answer: 12 inches
Nuclear density gauges must be placed at least 12 inches from any vertical obstruction to avoid backscatter interference that skews readings.
Question 2: Which AASHTO standard governs the method for determining the bulk specific gravity of compacted asphalt mixtures?
- AASHTO T 166 (Correct answer)
- AASHTO T 209
- AASHTO T 245
- AASHTO T 283
Correct answer: AASHTO T 166
AASHTO T 166 is the standard method for determining the bulk specific gravity of compacted bituminous mixtures using saturated surface-dry specimens.
Question 3: A paving inspector notices segregation in the mat behind the paver. Which action should be taken FIRST?
- Notify the contractor and document the location (Correct answer)
- Immediately halt paving operations
- Call the project engineer for approval to continue
- Apply additional tack coat to the segregated area
Correct answer: Notify the contractor and document the location
The first step is to notify the contractor and document the location so corrective action can be tracked and applied before more area is affected.
Question 4: What is the primary purpose of performing a ride quality (smoothness) measurement on a newly paved surface?
- To verify pavement color uniformity
- To assess structural load capacity
- To evaluate surface texture for friction
- To ensure long-term pavement performance and user comfort (Correct answer)
Correct answer: To ensure long-term pavement performance and user comfort
Ride quality measurements verify that the finished pavement surface meets smoothness specifications, which directly impacts long-term performance and driver comfort.
Question 5: During a tack coat inspection, the emulsion appears to have broken and dried to a brown color before the HMA overlay arrives. What is the correct action?
- Proceed with paving since cured tack coat still bonds
- Apply a second tack coat layer on top of the cured one
- Notify the engineer and determine if reapplication is required (Correct answer)
- Increase the HMA laydown temperature to improve bonding
Correct answer: Notify the engineer and determine if reapplication is required
A tack coat that has dried completely may lose tackiness; the inspector must notify the engineer who will determine whether reapplication is necessary before paving.
Question 6: Which document serves as the primary source for mix design targets and acceptable tolerance ranges during HMA production inspection?
- The plant calibration log
- The job mix formula (JMF) (Correct answer)
- The certified materials list
- The contractor's paving plan
Correct answer: The job mix formula (JMF)
The job mix formula (JMF) establishes the target gradation, binder content, and volumetric properties that the inspector uses to evaluate plant production and verify compliance.
Question 7: An inspector measures a completed lift thickness and finds it is 0.3 inches thinner than specified. What is the most appropriate response?
- Accept the lift and note it in the daily report
- Require immediate removal and replacement of the deficient area
- Document the deficiency and consult the project engineer for disposition (Correct answer)
- Apply an additional thin lift to compensate for the deficiency
Correct answer: Document the deficiency and consult the project engineer for disposition
Deficiencies outside tolerance must be documented and referred to the project engineer, who will determine acceptance, price adjustment, or removal based on contract specifications.
PIC Inspection Standards & Quality Control 2
When performing a mat density test using a nuclear gauge, the inspector must ensure the gauge is placed at least how far from any vertical obstruction?