Asphalt and Aggregate Flashcards

Which ASTM standard governs the determination of flash and fire points of bituminous materials using the Cleveland Open Cup method?

Answer: ASTM D92

ASTM D92 covers the Cleveland Open Cup method for determining flash and fire points of petroleum products including bituminous materials.

In the Marshall mix design method, what term describes the load required to produce failure in a compacted asphalt specimen?

Answer: Stability

Marshall Stability is the maximum load a compacted asphalt specimen can resist before failing under the Marshall testing apparatus.

What does the term 'VMA' stand for in asphalt mix design terminology?

Answer: Voids in Mineral Aggregate

VMA (Voids in Mineral Aggregate) represents the total void space between aggregate particles in a compacted paving mixture, including air voids and asphalt binder.

Which test method is used to measure the elongation index of coarse aggregate according to Canadian standards?

Answer: CSA A23.2-13A

CSA A23.2-13A is the Canadian standard test method for determining the elongation index of coarse aggregate particles.

At what temperature range is polymer-modified asphalt (PMA) typically stored to prevent phase separation?

Answer: 140–160°C

Polymer-modified asphalt is typically stored at 140–160°C with agitation to prevent polymer settling and phase separation.

The Superpave gyratory compactor (SGC) applies what combination of angle and pressure during specimen compaction?

Answer: 1.25° internal angle and 600 kPa

The SGC operates at a 1.25° internal angle and 600 kPa vertical pressure to compact asphalt specimens that simulate field compaction.

Which property of aggregate is assessed by the micro-Deval test?

Answer: Abrasion and attrition resistance

The micro-Deval test (ASTM D6928 / CSA A23.2-29A) measures the resistance of coarse aggregate to abrasion and attrition using steel balls and water.