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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.



How a pothole develops1
HOW A POTHOLEDEVELOPS


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)


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





Photo No. 4:

AI 38: Use for Group


Photo No. 5:

AI 30: Use for Group


Photo No. 6:

AI 47: Use for Group


Photo No. 7:

AI 47: Use for Group


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