Pavement maintenance 1
This presentation is the property of its rightful owner.
Sponsored Links
1 / 52

PAVEMENT MAINTENANCE 1 PowerPoint PPT Presentation


  • 108 Views
  • Uploaded on
  • Presentation posted in: General

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.

Download Presentation

PAVEMENT MAINTENANCE 1

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


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 develops

HOW A POTHOLE DEVELOPS


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


Pavement maintenance 1

“There’s a gentleman here to see you about potholes.”


Permanent repairs

Permanent Repairs


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.


Remove failed materials

Remove Failed Materials


Place patching mixture

Place Patching Mixture


Spread mixture carefully

Spread Mixture Carefully


Compact each lift thoroughly

Compact Each Lift Thoroughly


Straight edge the patch

Straight-edge the Patch


Blown in pothole filler

Blown-in Pothole Filler


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


Don t do this

Don’t do this!


Or this

Or this!


Proper crack sealing technique

Proper Crack Sealing Technique


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)


Pavement maintenance 1

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?


Pavement maintenance 1

Crack Sealing


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


Pavement maintenance 1

Photo No. 1:


Pavement maintenance 1

Photo No. 2:


Pavement maintenance 1

Photo No. 3:


Pavement maintenance 1

Photo No. 4:

AI 38: Use for Group


Pavement maintenance 1

Photo No. 5:

AI 30: Use for Group


Pavement maintenance 1

Photo No. 6:

AI 47: Use for Group


Pavement maintenance 1

Photo No. 7:

AI 47: Use for Group


  • Login