CCIL Asphalt Mix Compliance Testing 3

Question 1

Which distress mechanism does the Indirect Tensile Strength (IDT) test primarily evaluate in asphalt mixtures?

Accepted Answer

Thermal cracking at low temperatures

Answer

Rutting at high temperatures

Answer

Moisture-induced stripping

Answer

Fatigue cracking at intermediate temperatures

Question 2

In aggregate consensus property testing, what is the maximum allowable uncompacted void content for fine aggregate angularity (FAA) for a 10-million+ ESALs traffic level?

Accepted Answer

45% minimum

Answer

40% minimum

Answer

43% minimum

Answer

47% minimum

Question 3

What is the role of a correction factor when using the ignition oven test for asphalt binder content determination?

Accepted Answer

Compensates for aggregate mass loss during ignition

Answer

Adjusts for moisture in aggregates

Answer

Corrects for oven temperature variation

Answer

Accounts for binder volatilization

Question 4

Which ASTM or AASHTO standard covers the determination of bulk specific gravity (Gmb) of compacted asphalt specimens?

Accepted Answer

AASHTO T 166

Answer

AASHTO T 209

Answer

ASTM D7227

Answer

AASHTO T 335

Question 5

When evaluating moisture susceptibility, the Tensile Strength Ratio (TSR) must typically meet a minimum value of:

Accepted Answer

0.80

Answer

0.60

Answer

0.70

Answer

0.90

Question 6

In Superpave mix design, which sieve size is used to distinguish between surface and base course nominal maximum aggregate size (NMAS) classifications?

Accepted Answer

12.5 mm

Answer

9.5 mm

Answer

19.0 mm

Answer

25.0 mm

Question 7

Which property of the asphalt binder is most directly related to rutting resistance at high pavement temperatures?

Accepted Answer

G*/sin δ (dynamic shear modulus/phase angle)

Answer

Penetration grade at 25°C

Answer

Bending Beam Rheometer (BBR) stiffness

Answer

Force Ductility at 25°C