Mixed Deck — All PIC Topics Flashcards

The moisture susceptibility of an HMA mix is most commonly evaluated using which test?

Answer: Lottman Test (AASHTO T 283 — Tensile Strength Ratio)

AASHTO T 283 (commonly called the Lottman test) evaluates moisture susceptibility by comparing the tensile strength of conditioned versus unconditioned specimens as the Tensile Strength Ratio (TSR).

Why is consistent paver speed important?

Answer: To maintain consistent mat quality

Maintaining a consistent speed ensures uniform mat thickness and compaction, improving pavement quality.

What is the purpose of the screed in an asphalt paver?

Answer: To spread and compact the asphalt

The screed is responsible for spreading and initial compaction of the asphalt to the required thickness and width.

The term 'extracted gradation' during quality control refers to:

Answer: The gradation of the aggregate obtained from a recovered HMA plant sample after binder extraction

Extracted gradation is performed on the aggregate remaining after chemically removing the asphalt binder from a plant-produced HMA sample, verifying the blend matches the JMF.

How does increasing the number of passes on a nearly cooled mat (below 175°F) typically affect the compaction result?

Answer: Has little effect on density and may cause surface damage

Once HMA cools below approximately 175°F the binder is too stiff to be re-worked, so additional passes add minimal density while risking surface cracking or aggregate fracture.

An inspector observes that a longitudinal joint is consistently raised 0.5 inches above the adjacent lane after compaction. This condition is most likely caused by:

Answer: Too much HMA overlap maintained during paving across the cold joint

Excessive overlap of the new lane over the cold joint results in a high ridge after rolling because the surplus material has insufficient space to compact flush.

According to typical specifications, what is the maximum allowable lift thickness for granular subbase compaction?

Answer: 6 to 8 inches loose measurement

Most highway specifications limit granular subbase lifts to 6–8 inches loose (compacting to roughly 5–6 inches) to ensure uniform compaction through the full depth.

When a paving inspector reviews plant tickets, the binder content is reported as percent by:

Answer: Total weight of the mix (percent by total mass)

Asphalt binder content is reported as a percentage of the total weight of the mix (percent by total mass), not just the aggregate weight.

What is the purpose of keeping the front drum of a steel tandem roller wet during asphalt compaction?

Answer: To prevent hot asphalt from sticking to the drum

Water (often mixed with a small amount of release agent) is applied to the drum to prevent hot asphalt from adhering to it, which would cause mat tearing and surface defects.

Why is wearing PPE important on paving sites?

Answer: To protect workers from safety hazards

Personal protective equipment (PPE) minimizes exposure to hazards that can cause serious injuries or illnesses.

Rutting in an asphalt pavement is best described as:

Answer: Permanent surface deformation in the wheel paths

Rutting is permanent deformation appearing as longitudinal depressions in the wheel paths caused by consolidation or lateral movement under traffic loads.

What is the purpose of performing a sieve analysis?

Answer: To evaluate particle size distribution

The purpose of performing a sieve analysis is to evaluate the particle size distribution of aggregates used in asphalt mixtures. This test separates aggregates into different size fractions using a series of sieves. Understanding the gradation is essential for ensuring the aggregates meet specifications and contribute to a stable and durable asphalt mix.

When documenting activities related to roller pattern & compaction equipment, which practice is considered essential for PIC certification holders?

Answer: Maintaining comprehensive records that include procedures, observations, results, and any anomalies

Comprehensive documentation that includes procedures, observations, results, and any anomalies is essential in roller pattern & compaction equipment. This supports quality assurance, enables peer review, and satisfies regulatory and audit requirements.

When documenting activities related to lift thickness & surface tolerance, which practice is considered essential for PIC certification holders?

Answer: Maintaining comprehensive records that include procedures, observations, results, and any anomalies

Comprehensive documentation that includes procedures, observations, results, and any anomalies is essential in lift thickness & surface tolerance. This supports quality assurance, enables peer review, and satisfies regulatory and audit requirements.

Polished aggregate at a pavement surface is considered a distress because it:

Answer: Reduces skid resistance and increases the risk of vehicle crashes

Polished aggregate is worn smooth by traffic, reducing the texture needed for skid resistance and increasing the risk of skidding, especially on wet pavement.

Which property is assessed by the air voids test in asphalt mixtures?

Answer: Void content in the mix

The air voids test in asphalt mixtures assesses the void content, which refers to the small pockets of air trapped within the compacted asphalt. Proper air void content is critical for pavement performance; too few voids can lead to rutting, while too many can make the pavement permeable to water and susceptible to damage.

What minimum temperature (°F) is typically recommended for breakdown rolling of a PG 64-22 mix?

Answer: 275°F

Breakdown rolling for a PG 64-22 mix should begin while the mat is still above approximately 275°F to allow adequate workability and density achievement.

A PIC professional encounters an unfamiliar situation while performing epa stormwater & erosion control duties. What is the most appropriate first action?

Answer: Consult relevant standards, guidelines, or a qualified supervisor before proceeding

When facing unfamiliar situations in epa stormwater & erosion control, the most appropriate action is to consult relevant standards, guidelines, or a qualified supervisor. This ensures safety, accuracy, and compliance while building professional knowledge.

Bleeding (or flushing) on an asphalt surface is caused by:

Answer: Excess asphalt binder migrating to the surface

Bleeding occurs when excess asphalt binder migrates to the pavement surface, creating a shiny, sticky film that reduces skid resistance.

What is the benefit of site-specific safety plans?

Answer: They improve safety by targeting specific risks

They address the unique hazards of each site, improving safety outcomes and regulatory compliance.