CCIL - Canadian Council of Independent Laboratories Pavement Construction and Inspection Questions and Answers Flashcards

What test method is used to determine the in-place density of compacted hot mix asphalt using a nuclear gauge on a pavement project?

Answer: ASTM D2950 / AASHTO T 355

ASTM D2950 (AASHTO T 355) covers the use of nuclear methods to measure the density of in-place bituminous paving mixtures without coring.

What is the minimum air void content typically specified for compacted hot mix asphalt pavement lifts to ensure adequate durability?

Answer: 3%

A minimum of 3% air voids in the compacted mat is specified to prevent flushing and rutting while maintaining adequate aggregate interlock.

During asphalt paving operations, what is the maximum allowable pavement temperature for breakdown rolling to begin on most projects?

Answer: Above 120°C (250°F)

Breakdown rolling must begin when the mat temperature is still above 120°C to achieve proper compaction before the asphalt stiffens and resists densification.

What CCIL certification type is required for technicians conducting asphalt pavement field inspection and density testing on highway projects?

Answer: CCIL Type II (Asphalt)

CCIL Type II certification covers hot mix asphalt field testing and inspection, including density, temperature, and sampling from the paving train.

What is the purpose of a longitudinal joint in asphalt pavement construction?

Answer: To connect adjacent lanes paved in separate passes while maintaining density at the seam

Longitudinal joints form where two adjacent lanes meet and must be properly lapped and compacted to avoid a weak plane that accelerates cracking.

Which pavement distress type is characterized by interconnected cracks forming a pattern resembling alligator skin, typically caused by fatigue failure?

Answer: Alligator (fatigue) cracking

Alligator cracking results from repeated traffic loading causing tensile fatigue at the bottom of the asphalt layer, with cracks propagating upward to the surface.