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Idaho Roads Scholar Program. PAVEMENT MAINTENANCE 1. Part 3: Potholes and Cracks. Objectives. Explore alternatives for repairing potholes, Review options for extensive patching, Investigate methods and materials for treating pavement cracking. . HOW A POTHOLE DEVELOPS.

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pavement maintenance 1
Idaho

Roads Scholar

Program

PAVEMENT MAINTENANCE 1

Part 3: Potholes and Cracks

objectives
Objectives
  • Explore alternatives for repairing potholes,
  • Review options for extensive patching,
  • Investigate methods and materials for treating pavement cracking.
elements of successful pothole patching
Elements of Successful Pothole Patching
  • Use high-quality patching materials, which are cost-effective compared to less expensive products.
  • Place--do not throw--material in the patch area.
  • Compact every patch.
high quality cold mixes include
High Quality Cold Mixes Include:
  • Carefully selected aggregate types and gradations
    • Very clean, durable aggregates
    • Very little sand-mixtures are porous
  • Polymer modified binder
  • Additives that promote adhesion in wet conditions
asphalt cold patch materials
Asphalt Cold Patch Materials
  • Standard Spec 00745.00 Asphalt Cold Patch-High Performance
  • Qualified Products List available describing suitable materials
dig out and repair
Dig Out and Repair
  • Identify area affected
  • Remove to sound material
  • Clean, tack edges
  • Place patching mixture
  • Compact
  • Check level
mark area to be patched
Mark Area to be Patched

Mark patch area, extending at least 1 foot outside of distressed area.

blown in filler
Blown-In Filler

The hole is cleaned with a high volume blower.

A tack coat of asphalt is applied to the area.

A mixture of aggregate and hot asphalt fills the hole.

A finish coat of aggregate, and traffic flows.

SPRAY INJECTION

patching rules of thumb
Patching Rules of Thumb
  • Dig out 1 foot beyond the visible cracking
  • Don’t rock the jackhammer
  • Dig out at least 1 1/2 times the thickness of the failed AC
  • Compaction, compaction, compaction.
questions
Questions?

Potholes and Cracks

crack treatments purpose
Crack TreatmentsPurpose
  • Used to prevent water and debris from entering individual cracks in the asphalt pavement surface
  • Crack treatments are both a corrective and preventative maintenance treatment.
crack sealing
Crack Sealing

Feasibility

Extent of Problem

Distress Type

Major

Minor

Fatigue Cracking

Linear & Block Cracking

“Stable” Rutting

Raveling

Flushing/Bleeding

Roughness

Friction Loss

Moisture Damage

Shoving

Feasible

Not Appropriate

crack sealing1
Effectiveness

Effective

Marginal

No Impact

Crack Sealing

Extent of Problem

Distress Type

Major

Minor

Fatigue Cracking

Linear & Block Crack “Stable” Rutting

Raveling

Flushing/Bleeding

Roughness

Friction Loss

Moisture Damage

Shoving

crack repair guidelines
Crack Width

Treatment Options

< 1/8 inch (3 mm), non-working

  • Do nothing
  • Fog seal
  • Surface treatment (chip seal, slurry, etc.)

1/8 – 3/4 inch

(3 – 19 mm)

  • Crack Fill (short life, prep for resurfacing)
  • Crack Seal (> 5 yr life)

> 3 /4 inch (19 mm)

  • Filling (sand or sand-emulsion slurry)
  • Patching (cut and replace material)
Crack Repair Guidelines
for effective crack sealing
For Effective Crack Sealing:
  • Perform sealing during late fall/early spring when cracks are open.
  • Sealing does not proceed if rain is imminent.
  • Ambient or surface temperature should meet manufacturer’s requirements—usually 40F and rising for routing and sealing.
  • Use appropriate materials.
preparation is key
Preparation is Key!
  • Spray the weeds in advance
  • Clean the pavement surface.
  • Provide for traffic control.
  • Clean the crack, removing any moss or grass out of crack.
  • Dry the crack if necessary. (Hot air lance)
  • Fill it with crack seal material.
  • Apply something to surface of seal to minimize the tackiness.
pavement preparation
Pavement Preparation
  • Cleaning and Drying
    • Broom
    • Compressed Air
    • Sandblasting
    • Hot Air Blasting (Heat Lance)
slide33
Cracks Must Be Clean & Dry

Use Compressed Air

Note: Be Sure Compressor Is Equipped With A Moisture Trap

or clean with a hot air lance
Up to 3000°F

> 2000 ft/sec blast velocity

Propane burner-no flame

Conducted immediately ahead of sealant installation (5 mins or 50 yards max)

Comments:

For wet conditions, lance can improve performance

Otherwise, compressed air may be more effective (Québec study)

...Or Clean with a Hot Air Lance
rout and seal
Rout and Seal
  • Cut the pavement to a prescribed width and depth
  • Improves sealant performance
    • Better adhesion
    • Reduced tensile stress on material

Crafco, Inc

crack sealing2
Crack Sealing

W

D

Typical Dimensions:

W = 0.5” to 0.75”

D = 0.5” to 0.75”

traffic control
Traffic Control
  • Detour traffic until seal cures
  • Cover sealant with sand for quick opening
  • Begin filling at pavement centerline
blotting materials
Blotting Materials
  • Dry sand
  • Toilet paper (proven effective in SHRP research!)
crack seal materials
Crack Seal Materials
  • Standard Spec 00746.00 Poured Filler/ Hot Poured
  • Qualified Products List available describing suitable materials
crack seal
Crack Seal
  • The most common product used: D1190
  • Cost per pound: $0.26
  • Cost per linear foot to crack seal: $0.40
  • Should reseal after 5 years?
crack sealing rules of thumb
Crack Sealing Rules of Thumb
  • For linear cracks only (not intended form alligator cracking)
  • Clean cracks with forced air or heat lance
  • Don’t over-fill crack with sealant; avoid surface smears
  • Sweep up excess sanding
review
Review
  • Investigate methods and materials for treating pavement cracking,
  • Explore alternatives for repairing potholes,
  • Review options for extensive patching.
questions1
Questions?

Potholes and Cracks

small group activity
Small Group Activity
  • Identify the distress
  • Describe the cause
  • Outline the optimum maintenance repair

10 Minutes

slide49
Photo No. 4:

AI 38: Use for Group

slide50
Photo No. 5:

AI 30: Use for Group

slide51
Photo No. 6:

AI 47: Use for Group

slide52
Photo No. 7:

AI 47: Use for Group

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