PIC Materials Testing & Asphalt Composition 2

Question 1

What does the term 'air voids' refer to in a compacted asphalt mix?

Accepted Answer

The percentage of empty space not filled by asphalt binder or aggregate

Answer

Air voids are the percentage of total mix volume that consists of small air spaces not filled by asphalt or aggregate.

Question 2

A Marshall stability test measures which property of an asphalt mix?

Accepted Answer

Resistance of the compacted specimen to deformation under load

Answer

The Marshall stability test measures the maximum load a compacted asphalt specimen can resist before deforming under a specified loading rate.

Question 3

Which sieve size is used as the maximum aggregate size designation for a 19 mm Superpave mix?

Accepted Answer

19.0 mm

Answer

The nominal maximum aggregate size for a 19 mm Superpave mix is 19.0 mm, meaning 100% of aggregate passes the next larger sieve.

Question 4

The dust-to-binder ratio in a Superpave mix is calculated by dividing the percent passing the No. 200 sieve by:

Accepted Answer

The effective binder content by total mix weight

Answer

The dust-to-binder ratio divides the percent of material passing the No. 200 sieve by the effective asphalt binder content expressed as a percentage of total mix mass.

Question 5

During field extraction testing of an asphalt core, what is the primary purpose of centrifuge extraction?

Accepted Answer

To separate the asphalt binder from the aggregate for content measurement

Answer

Centrifuge extraction uses a solvent to separate and recover the asphalt binder from aggregate, allowing determination of binder content.

(PIC) Paving Inspector Certification Practice Test

(PIC) Paving Inspector Certification Practice Test

PIC Materials Testing & Asphalt Composition 2