Pavement Joints & Longitudinal Seam Construction Flashcards
7 cards from real PIC practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Pavement Joints & Longitudinal Seam Construction flashcards as text
A notched wedge joint is designed primarily to:
Answer: Provide a tapered, stepped edge profile that improves compaction and density at the joint
The notched wedge creates a gradually tapered wedge with a small vertical notch that allows better roller access and improved density along the joint edge compared to a straight vertical face.
The wedge taper of a notched wedge joint is typically constructed with a horizontal-to-vertical slope of approximately:
Answer: 12:1 (horizontal to vertical)
The 12:1 horizontal-to-vertical slope creates a gradual enough taper for the roller to achieve better edge compaction than is possible with a vertical butt joint face.
The vertical 'notch' at the bottom of a notched wedge joint is typically cut to a depth of approximately:
Answer: One-third to one-half of the compacted lift thickness
The vertical notch at one-third to one-half lift depth provides a surface area for tack coat and creates a mechanical key that helps lock the adjacent lane in place at the most critical zone.
During notched wedge joint construction, the notch-cutting attachment is typically operated:
Answer: Simultaneously with paving by the paver operator or paving crew as part of the paver setup
The notch-cutting attachment is mounted on the paver screed and is operated simultaneously with paving, so the inspector must verify it is correctly set before paving begins.
After the adjacent lane is placed against a notched wedge joint, where should the inspector focus density testing efforts?
Answer: At the joint area and free edge, which are most vulnerable to under-compaction
The joint area and free pavement edge are the hardest locations to compact, so density testing must be concentrated there to confirm that specification minimums are achieved.
What structural advantage does a notched wedge joint have over a standard cold vertical butt joint?
Answer: It provides greater bonded contact surface area and distributes traffic stress over a larger interface
The tapered interface distributes traffic loads and thermal stresses over a larger bonded area compared to a simple vertical face, reducing stress concentrations that initiate cracking.
When inspecting a completed longitudinal joint, which characteristic is the most critical indicator of long-term joint quality?
Answer: Density and smoothness achieved at the joint relative to specification requirements
Joint density and surface smoothness directly determine long-term performance — low density allows water infiltration and accelerates cracking, while surface irregularities cause ride quality failures and stress concentrations.