CCIL Asphalt Mix Compliance Testing 4

Question 1

Which test is used to measure the fracture energy of asphalt mixtures at intermediate temperatures to characterize fatigue cracking resistance?

Accepted Answer

Semi-Circular Bend (SCB) Test

Answer

The Semi-Circular Bend (SCB) test measures fracture energy and is used to characterize intermediate-temperature cracking resistance per AASHTO T 393.

Question 2

In volumetric mix design, Voids Filled with Asphalt (VFA) is calculated using which two parameters?

Accepted Answer

VMA and Va

Answer

VFA is calculated as ((VMA - Va) / VMA) × 100, using voids in mineral aggregate and air void content.

Question 3

Under CCIL's accreditation scope, labs performing AASHTO T 324 (Hamburg Wheel-Track) must demonstrate proficiency with a maximum rut depth limit at 20,000 passes for most mixes of:

Accepted Answer

12 mm

Answer

AASHTO T 324 typically specifies a maximum rut depth of 12.5 mm at 20,000 passes as the failure criterion for most traffic levels.

Question 4

What is the significance of the 'inflection point' observed in a Hamburg Wheel-Track rut depth versus load cycles plot?

Accepted Answer

It indicates the transition from consolidation to stripping failure

Answer

The inflection point in Hamburg test data marks the transition from rutting due to consolidation to accelerated rutting caused by moisture-induced stripping.

Question 5

Which aggregate property test measures the resistance of coarse aggregate to degradation by abrasion and impact using the Los Angeles machine?

Accepted Answer

AASHTO T 96

Answer

AASHTO T 96 (ASTM C131/C535) governs the Los Angeles abrasion test for resistance of aggregate to degradation.

CCIL - Canadian Council of Independent Laboratories Practice Test

CCIL - Canadian Council of Independent Laboratories Practice Test

CCIL Asphalt Mix Compliance Testing 4