PIC Roller Pattern & Compaction Equipment 3

Question 1

What is the term used to describe the overlap of successive roller passes to ensure full coverage of the mat width?

Accepted Answer

Pass increment

Answer

A pass increment (or lane offset) defines how far the roller moves laterally between passes to ensure the entire mat width receives consistent compactive effort.

Question 2

When compacting a superpaved mix with a nominal maximum aggregate size of 19 mm, what is the recommended maximum loose lift thickness?

Accepted Answer

3 times NMAS (≈ 2.25 in)

Answer

A general rule of thumb is that loose lift thickness should not exceed 3 times the NMAS to ensure aggregate interlock and adequate compaction throughout the lift.

Question 3

A pneumatic tire roller is MOST effective for which compaction task?

Accepted Answer

Kneading and sealing the surface after intermediate rolling

Answer

Pneumatic tire rollers are best at intermediate and finish rolling where their kneading action seals the surface and fills voids without displacing the partially cooled mix.

Question 4

What minimum temperature (°F) is typically recommended for breakdown rolling of a PG 64-22 mix?

Accepted Answer

275°F

Answer

Breakdown rolling for a PG 64-22 mix should begin while the mat is still above approximately 275°F to allow adequate workability and density achievement.

Question 5

Which of the following BEST describes the 'echelon paving' technique and its effect on compaction?

Accepted Answer

Multiple pavers paving adjacent lanes simultaneously to keep the joint hot

Answer

Echelon paving uses multiple pavers operating side by side so the longitudinal joint between lanes is compacted while both sides are still hot, yielding higher joint density.

(PIC) Paving Inspector Certification Practice Test

(PIC) Paving Inspector Certification Practice Test

PIC Roller Pattern & Compaction Equipment 3