NETTCP Asphalt Technology 2

Question 1

What does the term 'viscosity' describe in relation to asphalt binders?

Accepted Answer

The resistance of asphalt to flow under applied stress

Answer

Viscosity measures an asphalt binder's resistance to flow, which directly affects mixing, compaction, and pavement performance.

Question 2

Which Superpave performance grade parameter addresses rutting resistance at high service temperatures?

Accepted Answer

G*/sinδ at high temperature

Answer

G*/sinδ (dynamic shear modulus divided by sine of phase angle) measured at high temperature indicates resistance to rutting.

Question 3

What is the primary purpose of a tack coat applied between pavement layers?

Accepted Answer

To promote bonding between existing and new asphalt layers

Answer

Tack coats create an adhesive bond between layers, preventing slippage and delamination under traffic loads.

Question 4

In a Superpave mix design, what does the term 'Ndesign' represent?

Accepted Answer

The number of gyrations used to compact the design specimen

Answer

Ndesign is the number of gyratory compactor revolutions used to compact specimens to simulate expected traffic-level densification.

Question 5

Which aggregate property most directly affects the rutting resistance of an asphalt mix?

Accepted Answer

Particle shape and angularity

Answer

Crushed, angular aggregates interlock more effectively than rounded particles, providing greater resistance to permanent deformation under load.

(NETTCP) New England Transportation Technician Certification Program Practice Test