PIC Roller Pattern & Compaction Equipment 5

Question 1

What is the maximum allowable distance (feet) behind the paver screed at which breakdown rolling should typically begin?

Accepted Answer

50–75 ft

Answer

Breakdown rolling should begin as close to the paver as possible, typically within 50–75 feet, while the mat temperature remains in the optimal compaction window.

Question 2

A steel drum roller operating in vibratory mode crosses a bridge deck expansion joint. What should the operator do?

Accepted Answer

Turn off vibration before reaching the joint to avoid damaging the bridge

Answer

Vibration must be turned off before the roller reaches a bridge expansion joint or any rigid structure to prevent transmitting damaging shock loads.

Question 3

What is the purpose of keeping the front drum of a steel tandem roller wet during asphalt compaction?

Accepted Answer

To prevent hot asphalt from sticking to the drum

Answer

Water (often mixed with a small amount of release agent) is applied to the drum to prevent hot asphalt from adhering to it, which would cause mat tearing and surface defects.

Question 4

During compaction of a longitudinal joint between a new lane and an existing lane, which rolling direction provides the BEST result?

Accepted Answer

Roll the joint from the existing (cold) pavement side toward the new (hot) lane

Answer

Rolling from the cold side toward the hot lane uses the stiffer existing mat as a backing, pushing material into the joint rather than displacing the new mix outward.

Question 5

What is the MAIN disadvantage of using a very heavy roller (e.g., 14-ton static steel) on a thin HMA overlay (1 inch)?

Accepted Answer

The roller may shove, crack, or damage the underlying pavement structure

Answer

A very heavy roller on a thin overlay can transmit excessive force through the thin layer into the base, causing cracking or shoving because the lift provides insufficient cushion.

(PIC) Paving Inspector Certification Practice Test

(PIC) Paving Inspector Certification Practice Test

PIC Roller Pattern & Compaction Equipment 5