NETTCP Asphalt Technology 3

Question 1

What is the typical compaction temperature range for a conventional HMA mix using PG 64-22 binder?

Accepted Answer

270–310°F (132–154°C)

Answer

HMA compaction typically occurs between 270–310°F to achieve proper density before the mix cools and stiffens.

Question 2

What does 'bleeding' (flushing) indicate about an asphalt pavement surface?

Accepted Answer

Excess asphalt binder migrating to the surface

Answer

Bleeding occurs when excess binder fills air voids and rises to the pavement surface, creating a shiny, slick film.

Question 3

Which quality control test is performed in the field to estimate the asphalt content of a mix during paving?

Accepted Answer

Ignition oven extraction test

Answer

The ignition oven burns off the binder from a mix sample, allowing technicians to calculate asphalt content by weight difference.

Question 4

What aggregate characteristic is measured by the Los Angeles abrasion test?

Accepted Answer

Resistance to degradation under impact and abrasion

Answer

The LA abrasion test measures aggregate toughness by tumbling samples with steel charges and measuring the percentage of material worn away.

Question 5

In warm-mix asphalt (WMA) technology, what is the primary benefit of reducing production temperatures?

Accepted Answer

Reducing fuel consumption and worker fume exposure

Answer

WMA produced at 30–100°F lower temperatures cuts fuel use, reduces emissions, and lowers worker exposure to asphalt fumes.

(NETTCP) New England Transportation Technician Certification Program Practice Test