CCIL Asphalt and Aggregate 3

Question 1

What is the significance of the 'recovered asphalt' concept in pavement recycling?

Accepted Answer

Asphalt binder extracted from RAP for testing and characterization

Answer

Recovered asphalt refers to the binder extracted from reclaimed asphalt pavement (RAP) through solvent extraction or ignition, allowing its properties to be characterized and factored into mix design.

Question 2

Which ASTM test method determines the resilient modulus of asphalt concrete?

Accepted Answer

ASTM D4123

Answer

ASTM D4123 covers indirect tension testing of cylindrical bituminous specimens to determine resilient modulus.

Question 3

In aggregate quality testing, what does the term 'flat and elongated' particle refer to according to ASTM D4791?

Accepted Answer

Particles with a ratio of longest to shortest dimension exceeding 3:1 or 5:1

Answer

ASTM D4791 defines flat and elongated particles as those where the ratio of maximum to minimum dimension exceeds a specified threshold, typically 3:1 or 5:1.

Question 4

What is the primary purpose of the Bending Beam Rheometer (BBR) test in asphalt characterization?

Accepted Answer

Determine low-temperature stiffness and relaxation properties of asphalt binder

Answer

The BBR (AASHTO T313) measures the creep stiffness and m-value of asphalt binder at low temperatures to predict thermal cracking performance.

Question 5

Which specification parameter controls rutting resistance in Superpave Performance Grade (PG) binder testing?

Accepted Answer

DSR G*/sinδ ≥ 1.0 kPa for original binder

Answer

In Superpave PG grading, the DSR G*/sinδ ≥ 1.0 kPa for original binder (and ≥ 2.2 kPa after RTFO aging) ensures adequate rutting resistance at high pavement temperatures.

CCIL - Canadian Council of Independent Laboratories Practice Test

CCIL - Canadian Council of Independent Laboratories Practice Test

CCIL Asphalt and Aggregate 3