Common pavement issues

• Note barriers or issues common to all pavement types:
  • Clearance issues under structures – vertical.
  • Lane delineation – horizontal clearance.
  • Need to construct structures first!

Composite pavement

• Utilize a concrete base with two- to three-inch asphalt top.
• The asphalt creates a wearing course.

• Higher initial cost; many inexperienced contractors (new to area).
• Eliminates concrete final texture.

JPCP

• Conventional method; contractor familiarity.

CRC

• Long process; labor intensive for reinforcement installation.
• Higher cost; lack of experience by owner and contractors.
• Phasing of work is an issue.

Asphalt concrete pavement

• Utilize asphalt over a granular or CRABS base.

• Increases maintenance over the long-term; rutting may be an issue.
• Has shorter construction time under traffic.
• Familiar construction technique; provides larger contractor pool.

Crack and seat

• Break up into three- to four-foot sections and overlay.
• For existing concrete pavement only.

• Faces vibration concerns for adjacent landowners during construction; is a public relations concern.
• Performance risk due to reflective cracking.
• May not be a long-term solution.

Rubblization of existing pavement

• Break up existing concrete to three-inch minus and overlay with asphalt.
• For existing concrete pavement only.

• Can't run traffic during construction.
• More expensive than crack and seat option due to increased effort to break up concrete in place.
• A thicker overlay is required.

Rigid pavement over CRABS

• Develop process for recycling existing asphalt pavement (west of Meridian).

• Produces excess material – use for third lane.
• Is a proven process in Idaho.

Fast track concrete

• Use high-early-strength concrete for early opening of the roadway to traffic.

• Look at special situations (critical path).
• Is more expensive.
• There are durability concerns (shrinkage, cracking).
• Testing is intensive.

Base material: permeable versus dense-graded

• Compare asphalt-treated base (ATB), cement-treated base (CTB) and aggregate base (AB).

• ATB performs well under concrete.
• CTB hasn't performed well.
• AB is a conventional material.
• If ITD uses a permeable material, it will require a drainage system.

Sub-base material

• Consider a granular sub-base and rock cap.

• Granular sub-base is readily available; rock cap is questionable.
• Contractor is familiar with placement.

Edge drains

• Install positive pavement drainage.

• Limit to low spots on this project.
• Maintenance is required for long-term performance.
• Requires discharge point.

Material sources

• Have sources be State- or contractor-owned.
• Look at quality and quantity of available materials.

• Determine availability of acceptable material within a reasonable haul distance.
• May face competition with local and private projects.

Soil nail wall (Meridian structure)

• Accommodate loop ramp.
• Underpin existing abutment.

• Determine if loop is required.
• Consider a left-turn signal for eastbound traffic to I-84.
• Would be a short-term solution until the Meridian structure is replaced.
• Determine if this is cost effective.
• Explore alternative structure solutions.

Larger projects put out to bid

• Draw in contractors with greater capacity to speed up construction – they have more equipment and personnel.

• There are a limited number of contractors for large projects.
• Need to evaluate Associated General Contractors of America (AGC)/political considerations.

Retaining wall alternatives

• Consider utilizing precast wall system to accelerate construction.

• Requires ITD approval if not included on standard list.
• Ease of construction is a plus. Is readily available.