Asphalt Technology Flashcards

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

Answer: 270–310°F (132–154°C)

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

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

Answer: Excess asphalt binder migrating to the surface

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

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

Answer: Ignition oven extraction test

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

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

Answer: Resistance to degradation under impact and abrasion

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

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

Answer: Reducing fuel consumption and worker fume exposure

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

What is the standard method for determining the theoretical maximum specific gravity (Gmm) of an asphalt mix?

Answer: AASHTO T 209 (Rice test)

AASHTO T 209 (the Rice test) measures Gmm by determining the density of a loose asphalt mix with all air voids removed under vacuum.

Which pavement layer is directly beneath the surface course and provides structural support and load distribution?

Answer: Binder (intermediate) course

The binder course sits between the surface wearing course and the base, distributing traffic loads and providing structural capacity.