CCIL Asphalt and Aggregate 4

Question 1

What does the abbreviation 'RAP' stand for in pavement engineering?

Accepted Answer

Reclaimed Asphalt Pavement

Answer

RAP (Reclaimed Asphalt Pavement) refers to removed and reprocessed pavement materials containing asphalt binder and aggregate, commonly used in recycled mix designs.

Question 2

Which AASHTO test method is used to determine the dynamic shear rheology of asphalt binder?

Accepted Answer

AASHTO T315

Answer

AASHTO T315 uses the Dynamic Shear Rheometer (DSR) to measure the complex shear modulus (G*) and phase angle (δ) of asphalt binder specimens.

Question 3

What is the maximum allowable percent wear by mass loss in the Los Angeles abrasion test for aggregate used in surface course pavement?

Accepted Answer

25%

Answer

Most specifications limit Los Angeles abrasion loss to 25% or less for aggregate used in wearing course applications to ensure adequate durability.

Question 4

Which test measures the ductility of asphalt binder by pulling a briquette sample apart at a standard rate?

Accepted Answer

Ductility test (ASTM D113)

Answer

ASTM D113 measures ductility by elongating a briquette of asphalt binder at 25°C and 5 cm/min until it breaks, recording the distance in centimeters.

Question 5

In Superpave mix design, what is the design number of gyrations (Ndesign) used to simulate?

Accepted Answer

Traffic compaction over the pavement's design life

Answer

Ndesign represents the expected traffic compaction over the pavement's design life and is selected based on design ESALs to achieve target air void content.

CCIL - Canadian Council of Independent Laboratories Practice Test

CCIL - Canadian Council of Independent Laboratories Practice Test

CCIL Asphalt and Aggregate 4