pavement maintenance and rehabilitation strategies · pavement maintenance and rehabilitation...

11

PavementPavementMaintenance and Maintenance and

Rehabilitation Rehabilitation StrategiesStrategies

Presented by:Presented by:

Michael E. SymonsMichael E. SymonsPavement Research & Standards OfficerPavement Research & Standards Officer

February 19th, 2001

22

MaintenanceMaintenance

nn OrganizationOrganizationll 22 Highways Districts22 Highways Districtsll 28 Maintenance Contract Areas28 Maintenance Contract Areasll 16 Maintenance Contractors16 Maintenance Contractors

nn Maintenance ContractsMaintenance Contractsll Current Contracts are for 5 yearsCurrent Contracts are for 5 yearsll Expire in 2003/04Expire in 2003/04

33

Road InventoryRoad Inventory84,225 lane-km of highway

8,000 lane-km of Paved Secondary Highway15,000 lane15,000 lane--km of Paved Primary Highwaykm of Paved Primary Highway

25,200 lane-km of Paved Side Roads

500 lane-km of Gravel Secondary Highways35,525 lane-km of Gravel/Dirt Side Roads

44

Structure InventoryStructure Inventory

5,300 Structures2,700 Vehicular Carrying Bridges

800 structures that include Large Culverts, Pedestrian Overpasses and

Sign Structures

55

Maintenance StrategiesMaintenance Strategies

nn Crack Sealing Crack Sealing -- 1,400 km1,400 kmnn Sand/Graded Aggregate Seal Sand/Graded Aggregate Seal --

895,000m895,000m22

nn Patching Patching -- Various Types to a total of Various Types to a total of 1,932,000m1,932,000m22

nn Hot InHot In--Place Place -- 79,000m79,000m22

66

Rehabilitation StrategiesRehabilitation Strategies

nn Hot Mix Asphalt Pavement (Overlay)Hot Mix Asphalt Pavement (Overlay)nn Hot InHot In--Place RecyclingPlace Recyclingnn Graded Aggregate SealGraded Aggregate Sealnn MicroMicro--SurfacingSurfacingnn Low Temperature Recycled Asphalt Low Temperature Recycled Asphalt

PavementPavementnn Cold Placed Recycled Asphalt PavementCold Placed Recycled Asphalt Pavement

77

Asphalt Pavement OverlayAsphalt Pavement Overlay

nn Standard Overlay Standard Overlay -- 50mm50mmnn Normal Aggregate Size Normal Aggregate Size -- --19mm19mmnn Variations Variations ll Coarse Mix Coarse Mix -- 25mm aggregate size25mm aggregate sizell Fine Mix Fine Mix -- 16mm aggregate size16mm aggregate sizell Open Graded Surface CourseOpen Graded Surface Coursell SuperpaveSuperpave

88

CompletedCompleted OverlayOverlay

427 lane-km of overlay was carried out in 2000

99

Recycled Asphalt PavementRecycled Asphalt Pavement

nn Hot InHot In--Place Recycle Place Recycle -- GenerallyGenerallyll to a depth of 50mmto a depth of 50mmll with the addition of a Rejuvenating Agentwith the addition of a Rejuvenating Agentll with Addwith Add--Mix up to 20%Mix up to 20%

nn Low Temperature Recycled PavementLow Temperature Recycled Pavementll Mixed at about 100Mixed at about 100ooCCll Production about 100tph Production about 100tph ll Rejuvenator or AC often addedRejuvenator or AC often added

nn Cold Placed Recycled PavementCold Placed Recycled Pavementll Road blended additiveRoad blended additivell Sprayed AdditiveSprayed Additive

1010

Hot InHot In--Place TrainPlace Train

Normal Processing Depth = 50mmRejuvenating Agent Added in System

Up to 20% New Mix Added within System1,208,000m2 Processed in 2000 Season

1111

Hot InHot In--Place RecyclePlace Recycle

1212

Completed Hot InCompleted Hot In--PlacePlace

1313

Low Temperature Recycled Low Temperature Recycled MixMix

Mix Temperature About 100oCProduction Rate Near 100tph

Rejuvenator or AC Often Added

1414

Placing Low Temperature Placing Low Temperature Recycled MixRecycled Mix

Conventional Placing Practices Used

1515

Cold Placed Recycled MixCold Placed Recycled Mix

Test Site After Sand Sealing

2 Years After Application

1616

Surface TreatmentsSurface Treatments

nn Sand SealSand Sealnn Graded Aggregate Graded Aggregate

SealSealnn MicroMicro--SurfacingSurfacing

1717

Applying Graded AggregateApplying Graded Aggregate

Aggregate Being Applied to High Float Emulsion

1818

Graded Aggregate SealGraded Aggregate Seal

471 lane-km of GAS was applied during the 2000 Season

1919

MicroMicro--Surfacing in ProgressSurfacing in Progress

2020

MicroMicro--SurfacingSurfacing

1

GOLDENGOLDEN

BEARBEARO I L S P E C I A L T I E S

Preservative and Restorative Seals

““ROAD MANAGEMENTROAD MANAGEMENT””

The selections of a sequence of The selections of a sequence of appropriate strategies that yield the appropriate strategies that yield the desired level of service at the lowest desired level of service at the lowest

costcost

2

“COMPANIES MANUFACTURE “COMPANIES MANUFACTURE PRODUCTS TO BE PRODUCTS TO BE

SUCCESSFUL.”SUCCESSFUL.”

Chemically produced and manufactured Chemically produced and manufactured products yield the same result every time. products yield the same result every time. The key is knowing how they work…If you The key is knowing how they work…If you know how they work, you know how to use know how they work, you know how to use

them…The right application…The right them…The right application…The right handlinghandling

ASPHALT REJUVENATORSASPHALT REJUVENATORS

ll Offer low cost alternative maintenance methodsOffer low cost alternative maintenance methodsll Methods that due to staff changes, etc. may have been Methods that due to staff changes, etc. may have been

forgotten about in past years.forgotten about in past years.ll Should be considered to work along with existing methods Should be considered to work along with existing methods

of surface treatments in your preventative maintenance of surface treatments in your preventative maintenance program program –– i.e. i.e. –– the wear course seals the wear course seals –– chip seals, slurries.chip seals, slurries.

As maintenance costs increase As maintenance costs increase –– counties, municipalities counties, municipalities struggle with holding the line on costs.struggle with holding the line on costs.

Rejuvenators and Restorative seals can be the maintenance Rejuvenators and Restorative seals can be the maintenance person’s lowest cost insurance.person’s lowest cost insurance.

3

WHAT IS AN ASPHALT REJUVENATOR?WHAT IS AN ASPHALT REJUVENATOR?

Asphalt consists of two main fractions –“asphaltenes”which arethe hard brittle component, insoluble and not affected by oxidation and the highly reactive sub-fractions called “maltenes”. These maltenes are oily and resinous in appearance.

HOW DOES AN ASPHALT REJUVENATOR HOW DOES AN ASPHALT REJUVENATOR WORK?WORK?

This relationship of maltene and asphaltene percentage becomes out of balance in the aging process.

This aging process can start as early as initial hot plant production and continues through the pavement life cycle – the effects of time, weather, sunlight, etc.

4

KEYS TO A QUALITY REJUVENATORKEYS TO A QUALITY REJUVENATOR

An asphalt rejuvenator is a manufactured product which has the ability to absorb or penetrate into the pavement and restore those reactive components that have been lost due to oxidation

“KEYS TO A QUALITY REJUVENATOR”“KEYS TO A QUALITY REJUVENATOR”

l Proper base is essential. A napthenic or wax free base is ideal – the molecular make up offers more solvency power or absorption and fluxing ability.

l Rejuvenators are manufactured as emulsions similar to emulsions you are familiar with – typically 60-65% residual. They have the ability to “wet” the asphalt binder that is present.

5

RING TEST KIT

Reclamite® Preservative Seal

6


Curing

Reclamite® Application

7

Reclamite® curing approximately 20

minutes after application

Sand application to cured Reclamite®

Sanding application

8


County of Uxbridge, Toronto, Ontario, CanadaUnsealed

Reclamite® Curing Sanding

Sanding Completed


Babin Air, Invermere, British Columbia

9

Baker, Oregon

Airport Runway

CRF® Restorative Seal

Sealed

Reclamite® Test Section: .50 litres

sq. m.

Sand applied: 1 kg. Sq. m.

10

APPEARANCE OF RECLAMITE APPLIED 10 WEEKS EARLIER

NEW ASPHALT PAVEMENT, POOR COMPACTIONOPEN MAT

11

SEALED WITH RECLAMITE®APPROXIMATELY 12 YEARS

PRIOR

UNSEALED

SEALED

UNSEALED

12

TREATED

UNTREATED

SealedUnsealed

13

SEALED

UNSEALED

Treated

Untreated

14

Preventative MaintenancePreventative Maintenance ReclamiteReclamiteApplication Summary:Application Summary:

l Broom Pavementl Apply diluted (2:1) Reclamite® by Distributor l Application rate 0.05 - 0.15 Gsy.

.30 - .65 Litres Sq. M l Allow emulsion to break (½ - 1 hour)l Light sanding recommended 1-3 lbs. Sq. yd.

½ - 1 ½ Kg. Sq. m.l Open to traffic

161923Top ½” 12.5 mmUntreated

404882Top ½” 12.5 mmTreated

Depth 2 mos. 18 mos. 36 mos.

Penetration values of asphalt cores taken at intervals over over period of time

15

WHEN SHOULD REJUVENATORS BE WHEN SHOULD REJUVENATORS BE APPLIED?APPLIED?

Incorporated into a pavement management system:l As a fog seal to new asphalt pavementsl Where general open surface appearance tends to

develop hairline cracking, raveling, minor pitting.l Poorly compacted or segregated pavementsl A. those roads not requiring a wear coursel B. those roads not scheduled for major rehabilitationl C. those roads because of funding cutbacks, etc.

maintenance dollars will not be available in future years.

RECYCLING OF RAP WITH RECYCLING OF RAP WITH REJUVENATORSREJUVENATORS

16

REJUVENATORS CAN RESTORE REJUVENATORS CAN RESTORE DURABILITY TO THE RAPDURABILITY TO THE RAP

l Durability being the interdependence between composition and aging

l They can return a desired consistency to the aged asphalt

MIDLAND MIXTRAILER, STILLWATER COUNTY, MIDLAND MIXTRAILER, STILLWATER COUNTY, MIDLAND MIXTRAILER, STILLWATER COUNTY, MIDLAND MIXTRAILER, STILLWATER COUNTY, COLUMBUS, MONTANACOLUMBUS, MONTANACOLUMBUS, MONTANACOLUMBUS, MONTANA

17

Hauling of RAP from the pugmill

Blading of RAP

Compaction using rubber tire roller

18

Finished appearance

Finished appearance, light sand applied as a blotter

19

Compacted RAP with Reclamite® addition

RAP SECTION

20

Reclamite® - RAP from Hwy 1 being graded near North Bend (Boston Bar, BC)

RAP being graded, North Bend,

(Boston Bar, BC)

21

Application of Reclamite® and surface sanding – RAP millings, North Bend, (Boston Bar, BC)

Reclamite® Test Section applied to untreated RAP millings place approx 1 year previous

22

Sealed

Unsealed

Reclamite®

Section of untreated RAP surface treated with Reclamite®

RAP stockpile I-84, Forsyth, Montana

Montana DOT cold recycle project

23

Pugmill of Reclamite® with RAP milling, Montana DOT, Forsyth, Montana

Compaction of laid out RAP treated with Reclamite®, Forsyth, Montana

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Compacted surface, Forsyth, Montana, Montana DOT – RAP treated with Reclamite®

RESTORATIVE SEALSRESTORATIVE SEALS

Known as reinforced rejuvenators or restorative seals –they are used for sealing and rejuvenating those roads

with increased cracking, openness. They contain percentages of asphaltene and fillers that provide for

increased sand retention.

They do not provide asphalt rejuvenation to the same degree as rejuvenators.

They do provide a seal in depth – that is – pavement absorption as well as surface sealing – a flexible seal that

kneads and works with traffic action

25

CRF® Restorative SealBaker City, Oregon

CRF® Restorative SealWhistler/Blackcomb, British Columbia

CRF® Restorative Seal Curing

SANDING APPLICATION

2 KG/4 -5 LBS. – SQ.M / SQ. YD

26

Superior Road Products

Haliburton, Ontario

Squeegee and brooming



Brooming and Finished Appearance

27

CRF® RESTORATIVE SEALAPPLICATION SUMMARY:

1. Broom pavement (Clean surface)

2. Apply diluted CRF® by distributor (range 0.12 – 0.25 Gsy sq. yd) ( .45-.90 L. Sq. m.)

3. Single or double seal as dictated by pavement condition

4. Squeegee option

5. Allow emulsion to penetrate/break (1/2 – 1 hour)

6. Sand all CRF® applications (range 4-9 lbs. Sq. yd) ( 2-4 kg. Sq. m.

7. Drag broom option

8. Compaction option

9. Open to traffic

BENEFITS OF CRF®

• Safe, cold applied emulsion

• Economical cost effective process

• Resilient, durable crack repair

• Versatile product application

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CRF® Restorative Seal Appearance 1 year after application

Untreated surface close-up

Treated

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CANYON LISTER ROAD, CRESTON, B.C.

SUITABLE SURFACE FOR CRF®

RESTORATIVE SEALUNSEALED APPEARANCE

CANYON LISTER ROAD

SEALED APPEARANCE

CRF® RESTORATIVE SEAL

UNSEALED

SEALED

CANYON LISTER ROAD, CRESTON, B.C.

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Fairfield Airport

Teton County, Montana

Sealed

Sealed

Unsealed

Golden Bear Oil Specialties refinery based truck fleet

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CRFCRF®® COLD POUR CRACKFILLERCOLD POUR CRACKFILLER

ll One component productOne component productll Up to a 2 year shelf lifeUp to a 2 year shelf lifell Freeze stable emulsion in bulkFreeze stable emulsion in bulkll Very good hot and cold flexibilityVery good hot and cold flexibilityll Cracks do not need to be routedCracks do not need to be routedll Will not “string” or “snake” out of cracksWill not “string” or “snake” out of cracksll Road can be opened immediately after application and Road can be opened immediately after application and

the addition of sandthe addition of sandll Excellent product for squeegee seals or spray patchingExcellent product for squeegee seals or spray patching

APPLICATION OF CRF®APPLICATION OF CRF®

32

JJM HIGHWAY MAINTENANCE, VICTORIA, BRITISH COLUMBIA, CRF® APPLICATION

Capilano Highway Services, Whistler, BC, CRF® applicationCapilano Highway Services, Whistler, BC, CRF® application

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Capilano Highway Services, Whistler, BC, CRF® applicationCapilano Highway Services, Whistler, BC, CRF® application

Argo Road Maintenance, CRF® application, Highway 5A, Argo Road Maintenance, CRF® application, Highway 5A, Coquihalla Connector, Kelowna, BCCoquihalla Connector, Kelowna, BC

34

CURED CRF® APPROXIMATELY 5 WEEKS AFTERAPPLICATION

SHANNON LAKE ROAD, KELOWNA, B.C.

CRF® USED TO FILL IN WHERE HOT POUR RUBBERIZED CRACKFILLER HAS

“SNAKED” OUT

35

CRF® Cold pour crackfiller

Pothole Patching with CRF

Before

After

36

APPEARANCE OF ALLIGATORED PAVEMENT APPEARANCE OF ALLIGATORED PAVEMENT SECTIONS EITHER SPRAY PATCHED OR SECTIONS EITHER SPRAY PATCHED OR

SURFACE SHOT AND DRAG BROOMED WITH SURFACE SHOT AND DRAG BROOMED WITH CRF®CRF®

Contacts:

Judy Nelson, Customer Service Golden Bear Sales OfficeChandler, AZ

800-456-3878

Ron Pruett, Scottsdale, AZ602-867-2278

Dave Crone, San Diego, CA909-694-8933

Steve Escobar, Los Angeles, CA310-712-6203

Jim Brownridge, Kelowna, B.C., Canada

250-868-9711

aaInfrastructureInfrastructure

Vijay Ghai, P. Eng.

C-SHRP WORKSHOPFebruary 20, 2001

Introduction

• The preceeding presentation focused on routine maintenance activities - reactive in nature.

• This presentation is going to address planned strategies which AI uses to preserve the roadway system other than Overlays.

Background• Alberta Highway Network System.

8 Primary Highway Network consist of 14,000 km of paved highways

8 Secondary Highway Network consist of 10,000 km of paved highways

• The current standards of acceptability & performance expectations specifies design pavements to last 20 years before rehabilitation.

Background Cont’d.

• AI has had a Pavement Evaluation System (PES) in place since early 1970

• Pavement Management System (PMS) has been in place since early 1980 to predict the behavior of all pavements

• AI sets great precedence to smoothness of pavements - usually the end criteria for most rehabilitation

Background Cont’d.

• PES & PMS enables the development of a Construction Program and set suitable rehabilitation strategies (i.e. Structural Overlays or Non-Structural Strategies)

• 95% of Network Structural O/L -5% Non-structural Rehabilitation

Non-Structural Rehabilitation

• Non-Structural Rehabilitation can be classified as a Pavement Preservation Strategy

• Two Types− Hot In-Place Recycling (HIR)– Mill & Inlay

Hot In-Place Recycling

3.70 3.70

50mm Hot In-Place Recycling

Approximate Service Life: 9 yearsApproximate Length Constructed = 100km¥ Some Limitations

Cold Mill and Inlay

3.70 3.70

50mm Cold Milland Inlay

Approximate Service Life: 11 yearsApproximate Length Constructed = 102 km¥ Some Limitations

Cold Mill and Inlay(Divided Highway)

50mm Cold Milland Inlay

OTL3.7

OTL3.7

Approximate Service Life: 11 yearsApproximate Length Constructed = 340 Km¥ Inside lane in good condition

Thin Overaly

Predicted Service Life of thin O/L = 5 yearsOverlay & widening deferred by 5 years

FutureWidening

FutureWidening

Thin Overlay 30 - 40 mm ACP

Future O/L

Seal Coat

J Seal Coat is a major preventative maintenance used by AI.

J Typically, 500 - 600 km of highway are seal coated on an annual basis.

J 50% Primary Highways and 15% Secondary Highways have seal coat on them.

Seal Coat q Background:

• From 1959 to 1990, seal coat program was prepared based on sound engineering judgment of experts within the Department.

• Since 1995, an Expert System has been developed for the assessment, rating and prioritization of seal coat.

Seal Coatq Purpose

• Seal Coat applied to roads provide performance and safety benefits at relatively low cost.

• Seal Coats repairs surface deficiencies and provides a waterproof seal over the existing pavement.

• Other side benefits: improve skid resistance (reduce hydro-planning), resistance to wear, better reflection properties

Seal Coat q Program

• Projects that are good candidates for seal coat exhibit characteristics that could lead to ravelling, stripping, potholes and structural failures if left unprotected.

Seal Coat Program Cont’d.

• Regions prepares a list of candidate projects for the seal coat program.

• Selected consultants inspects, assess and rates each projects based on 7 attributes. (i.e. Segregation and general ravelling are the two major attributes).

• An annual priority list is prepared for program purposes.

Seal Coat Operation

Future Outlook

J RoMaRa, a new pavement management system, is being designed.

• It will address more cost effective preservation treatment options as one of its module.

• This development will lead to a more dynamic preservation program.

1

Alberta Infrastructure

• Highway Maintenance Activities for Pavement Preservation

Crack Repairs

• 10 + years evaluation of cold-pour emulsion cracksealing• Inconclusive results for benefit of cracksealing• Cracksealing done by maintenance contractor on schedule,

according to highway classification• Rout & Seal crack filling less than 5% of highways, mixed

results

2

Crack repair - Thermopatch

• Proprietary method• Trial basis on several

test projects• Cost effective on

severely depressed transverse cracks

• Service life ~ 3 years

Crack repair -mill & fill

• Developed in Alberta early 1990s

• Either stand-alone repair, or to replace leveling course

• Very effective. • ~ $100 per crack• Pavement shows

hairline cracks within 2 years, cracks stay same size for 5-6 years more

3

Crack repair -spray patch

• Most cost effective repair• Cracks redevelop within 1

year but pavement does not depress at crack

• Spray patch material ‘moves’ with pavement

• No effect on overlays

For the Future….

• Patchrite self-propelled pothole patching machine

• Continuation of cracksealing test • Multi-year warranty for pavement

maintenance as part of capital contracts

1

Treatment Selection in Pavement Management

• Role in pavement management• Strategy development• Selection methodologies• Alberta RoMaRa

Treatment Options in MYP

Trigger Point for Treatment 1

Age or Traffic Loads

Pav

emen

t C

ondi

tion

Ind

ex

Trigger Point for Treatment 2

Treatment 2 in Year Y at $S Cost

Existing Performance Treatment 1 in Years Xand Z at $ Cost

2

Treatment Strategies

• One or more maintenance or rehabilitation techniques

• Designed to improve or maintain conditions

• Tailored to consider constraints• Evaluated in terms of cost-effectiveness

Requirements for Developing a Strategy

• List of strategy guidelines and treatment options

• Costs• Pavement performance models

3

Sample Timing Options for Strategy Selection

Treatment Timing OptionsTrigger Points

Major Rehabilitation

Minor Rehabilitation

Age

Pav

emen

t Con

diti

on I

ndex

Options in Strategy Development

• Project Selection/ Treatment Selection-simultaneous or not

• Single treatments or multiple treatments

4

Single Treatment Strategy

• Most common approach• Several feasible alternatives may be

identified for each section• Each treatment considered

independently• Most cost-effective treatment generally

selected

Multiple Treatment Strategy

• Combination of treatments considered for each section

• Effectiveness of all treatments is representative of effectiveness of entire strategy

• Subsequent treatments affect selection of strategy

5

Illustration of Multiple Treatment Strategies

Trigger Limits

Strategy 1

Pav

emen

t Con

diti

on I

ndex

Time or Traffic Loads

Strategy 2

Requirements For Strategy Development

• List of all treatments to be considered in analysis

• Set of rules that determine when treatments should be considered feasible

6

Decision Trees

AsphaltPavement

70 or above

69 or below

Condition StructuralDeterioration

Not Present

Present

StructuralOverlay

FunctionalOverlay

Preventive Maintenance

Decision Matrix

Treatment Type Surface Type

Condition Level

Structural Deterioration

Preventive Maintenance Asphalt Concrete 70-100 N/A

Functional Overlay Asphalt Concrete 0-69 Not Present

Structural Overlay Asphalt Concrete 0-69 Present

7

Considerations in Developing Decision Trees/ Matrices

• Decision factors• Availability of data• Ability to predict conditions• Flexibility

Programmed Rules

• Outline criteria for selection of preferred treatment

• Set treatment for condition range• Could be transferred into

decision matrices or decision trees

8

Types of Treatments Considered

• Rehabilitation category • Specific treatment

Rehabilitation Categories

• Preventive Maintenance• Minor Rehabilitation

• Major Rehabilitation• Reconstruction

Functional

Structural

9

Specific Treatments

• Asphalt– Routine

Maintenance– Surface Seal Coats– Milling and Inlays– Thin Overlay– Thick Overlay– Mill and Overlay– Reconstruction

• Concrete– Slab Grinding– Full- and Partial-

Depth Repairs– Crack and Seat– Thin-Bonded

Overlay– Unbonded Overlay– Slab Replacement– Reconstruction

Factors to Consider in Developing Treatments

n Accuracy of cost estimates neededn Ability to differentiate performance

characteristicsn Level of detail requiredn Need for selection criteria

10

RoMaRa

• IRI• Rut Depth• Surface Condition Rating• FWD

Network Segment

Performance PredictionModelsCurrent Condition

Sections Triggeredin the Maintenance

Analysis

TrafficSN

Subgrade...

Future Condition

Sections Triggeredin the Maintenance

AnalysisCommitted Projects

Section J/Year ICondition

Rehabilitation AlternativeAnalysis (and Cost-Effectiveness)

Decision Trees

Candidate Treatmentsfor Section J/Year I

Candidate Treatmentsfor All Sections/Years

Optimization(Maximize Cost-Effectiveness

or Minimize Cost)

BudgetConstraint

Optimum Rehabilitation Strategy(Section, Treatment, Year)

PerformanceConstraint

FIGURE 1.1

HPMA Network LevelRehabilitation Analysis

ALBERTA INFRASTRUCTUREOctober 1999

11

DistressRoughness

1616Cold Mill lanes & full width overlay

1616HIR with full width overlay

1616Reprofiling with cold mill overlay

77Thin Overlay <40mm

99HIR with Thin Overlay (lanes)

Microsurfacing Rut Repair *

1111Hot in Place

99Reprofiling & Cold Mill *

Seal Coat

Crack Seal

Life ExpectancyDescription

Functional Treatments

DistressRoughness

2020Reconstruction

1616Cold In Place Recycle/ Full Depth reclamation

1616Pavement Reinforcement Overlay

1616Cold Mill / ACP, RCC, PCC *

1616Structural Overlay > 100mm

1616Structural Overlay <100mm(nominal thickness = 50mm)

Life ExpectancyDescription

Structural Treatments

12

Pavement Condition Parameter Trigger Level

T0 T1 T2

International Roughness Index (IRI) 2.4 2.8 3.7

Alligator Cracking (AC) 1% - 2% >2% - 4% >4%

Longitudinal Wheel Path Cracking(LWPC)

Low Severity Medium Severity High Severity

Rutting 15mm depth and 25% extent

20mm depth and 50% extent

25mm depth and 50% extent

Raveling 5% - 10% >10% – 20% > 20%

Surface Texture 10-40 (Low) 41-80 (Medium) > 80 (High)

Depressed Transverse Cracking 0-7 Severity and 0% - 1% Extent

8-15 Severity and >1% - 1.75% Extent

>15 Severity and > 1.75% Extent

DistressRoughness

0.50.5Deep Patch

0.50.5Rut Repair

0.50.5Skin Patch

0.10.1Thermo Patch

0.10.1Spray Patch

0.10.1Mill & Fill

0.10.1Rout & Seal

0.10.1Cold Pour

00Hot Pour

00Do Nothing/monitor

ChangeDescription

Maintenance Treatments

13

MicroChip

GASFog

Deep

RutSkin

ThermoSpray

Mill&Fill

Rout & Seal

Cold PourHot pour

Do Nothing

AlligDTLMTB

RavBleedACP Rut

PotholeRip Shov

DistnStr RutCracking

AC & Age > 7(T or T)0 1

N Y

AC < 10%

AC < 20% - Structural Treatment (H) - Level II Repair- Monitor (FWD)

N Y

- Full Reconstruction- Monitor (FWD)

- Structural Treatment (H) - Level II Repair- Monitor (FWD)

N Y

Roughness(T)0

N Y

Raveling(T)2

Non-StructuralRutting (T) or more1

Seal Coats

N Y

Monitor Age < 10

N Y

- Light Overlaywith Rut Repair- Full LengthRut Repair

Mill & Inlay

N Y

Surface TextureT2T o r 1

Do Nothing Seal Coats

N Y

Raveling(T)1

N Y

Roughness(T)2

Depressed TransverseCracks (T)0



N Y- Reprofile & Overlay (L)- Mill & Inlay- Hot In-place Recycle- Overlay (M)

- Reprofile & Overlay (L)- Mill & Inlay- Hot In-place Recycle- Overlay (M)- Level II Repair

N Y

- Reprofile & Overlay (L)- Mill & Inlay- Hot

Recycle- Overlay (M)- Level I Repair

In-place

N Y


Recycle- Overlay (M)

In-place

Roughness(T)1




N Y

- Overlay (L)- Mill & Inlay- Hot

RecycleIn-place

- Overlay (L) (II)- Mill & Inlay (II)

N Y

- Hot In-place Recycle- Mill & Inlay- Overlay (L)

N Y


N Y

N Y




N Y

Monitor Level II Repair +- Reprofiling + Overlay (L)- Mill & Inlay- Hot In-place Recycle- Overlay (M)

N Y

Level I Repair +- Reprofiling + Overlay (L)- Mill & Inlay- Hot In-place Recycle- Overlay (M)

N Y- Reprofiling + Overlay (L)- Mill & Inlay- Hot In-place Recycle- Overlay (M)

Roughness(T)0

N Y

Raveling(T)2

Non-StructuralRutting (T) or more1

Seal Coats

N Y

Monitor Age < 10

N Y

- Light Overlaywith Rut Repair- Full LengthRut Repair

Mill & Inlay

N Y

Surface TextureT2T o r 1

Do Nothing Seal Coats

N Y

Raveling(T)1

N Y

Roughness(T)2




N Y- Reprofile & Overlay (L)- Mill & Inlay- Hot In-place Recycle- Overlay (M)

- Reprofile & Overlay (L)- Mill & Inlay- Hot In-place Recycle- Overlay (M)- Level II Repair

N Y


Recycle- Overlay (M)- Level I Repair

In-place

N Y


Recycle- Overlay (M)

In-place

Roughness(T)1




N Y

- Overlay (L)- Mill & Inlay- Hot

RecycleIn-place

- Overlay (L) (II)- Mill & Inlay (II)

N Y


N Y


N Y

N Y




N Y

Monitor Level II Repair +- Reprofiling + Overlay (L)- Mill & Inlay- Hot In-place Recycle- Overlay (M)

N Y

Level I Repair +- Reprofiling + Overlay (L)- Mill & Inlay- Hot In-place Recycle- Overlay (M)

N Y- Reprofiling + Overlay (L)- Mill & Inlay- Hot In-place Recycle- Overlay (M)

Rutting(T)0

Rutting(T)1

Rutting(T)2

N Y

- Structural Treatment (M) + Leveling Course- Monitor (FWD)

N Y

- Structural Treatment (L) + Leveling Course- Monitor (FWD)

N Y- Structural Treatment (L)- Monitor (FWD)

AC & Age > 7(T)2

N Y

LWPC

N Y

N Y

LWPC

- Structural Treatment (L)- Monitor (FWD)

- Structural Treatment (M)- Monitor (FWD)

N Y

Age > 15or ESAL > 8.0

StructuralNumber >130


N Y


StructuralNumber > 80

N Y

- Full Depth Recycle- Reconstruction- Monitor (FWD)

N Y

Rutting(T)2



N Y




N Y



N Y



N Y




- Monitor (FWD) - Structural Treatment (L)- Monitor (FWD)

N Y

N Y


- Monitor (FWD) - Structural Treatment (L)- Monitor (FWD)

N Y


N Y

Rutting(T)1

N Y

Rutting(T)0

N Y


- Structural Treatment (H) + Leveling Course- Monitor (FWD)

N Y






N Y

N Y




N Y


N Y


- Structural Treatment (H)- Monitor (FWD)

N Y






N Y

N Y




N Y


N Y

- Full Depth Recycle- Reconstruction- Monitor (FWD)

N Y

Rutting(T)2


- Structural Treatment (H)- Monitor (FWD)

N Y






N Y

N Y




N Y


N Y

Rutting(T)1

N Y

Rutting(T)0

N Y

FIGURE 6.3Initial Decision Tree

ALBERTA INFRASTRUCTURELEGEND

L= LightM= MediumH= Heavy

BoldRegular

StructuralNon-Structural

14

LWPCAC & Age > 7(T)

2

LWPC

N Y

AC & Age > 7(T or T)0 1

N Y

Roughness(T)

0

Rutting(T)

0

N Y

Rutting(T)1

N Y

Rutting(T)2

Roughness(T)0

N Y

N Y

Roughness(T)0

Rutting(T)0

N Y

Rutting(T)

1

N Y

Rutting(T)

2

N Y

Rutting(T)

1

N Y

Rutting(T)

2

N Y

10

30

60

20

4050

7080

120

100

90

N Y

130

N Y

110

FIGURE 6.1

Structural Improvement Decision Tree


FIGURE 6.2

Non-Structural Improvement Decision Tree


Roughness( T )0

Y

Roughness( T )

2

N Y

Raveling( T )

1

DepressedTransverseCracks ( T )

0

N Y

DepressedTransverseCracks ( T )

1

N Y

DepressedTransverseCracks (T)2

N Y

Raveling( T )2

N Y

Non-StructuralRutting

N Y

200

250

280290

310320

Y

340

N Y

350

SurfaceTexture

(T o r T )1 2

Y

330

N

Roughness( T )1

DepressedTransverseCracks ( T )0


N Y


N Y

220

240

270

N Y

300



N Y


N Y

210

230

N Y

260

N

N

Manitoba Transportation and Government Services

Integrating Pavement Management 1

Integrating Pavement Integrating Pavement Management (PMS) into Management (PMS) into Manitoba TransportationManitoba Transportation

Canadian Strategic Highway Research Program (C-SHRP )Asphalt InstitutePavement Preservation Briefing TourWinnipeg Feb. 21, 2001


Manitoba Transportation PMSManitoba Transportation PMS

l Roadways similar in attributes will behave similarly Surface type

EnvironmentTraffic characteristics

l It costs more to maintain a poor roadway than a good roadway.

l Targeted to a Level of Service (LOS)

l Iterative system

l Based on a probabilistic approach ♥♥



Project GoalsProject Goals

l Develop meaningful Surface Condition Rating System (SCR)

l Create a Maintenance Management System (MMS) interface

l Develop & cultivate strong relationships with associated Branches.

l Provide Management with tools to review existing conditions, quantify short comings and evaluate long term strategies♥♥

Reg. Maintenance

Sealing

Overlay

Rout and Seal

Manitoba Transportation PMSManitoba Transportation PMS

PMS

SOFTWARE

SCR

LOS

MMS

♥



ChallengesChallenges

l Introduce PMS concepts into Department culture

l Reviewing the way we do businessl Defining successl Education and trainingl Staying on target ♥♥

Realizing the BenefitsRealizing the Benefits

To DateImproved communication

Technological innovations

Information exchange

New partnerships ♥♥



Realizing the BenefitsRealizing the Benefits

Long term

Optimizing resources to meet network objectives

Developing a long term preservation and improvement strategy ♥♥

Integrating Pavement Integrating Pavement Management (PMS) into Management (PMS) into Manitoba TransportationManitoba Transportation

Canadian Strategic Highway Research Program (C-SHRP ) Asphalt InstitutePavement Preservation Briefing TourWinnipeg Feb. 21, 2001 ♥


Lester Deane, P.Eng.Pavement Management Engineer(204) 945-3682

1

ManitobaTransportation andGovernment Services

Rout & SealProgram

Special Operations

• performing rout and crack sealing as a preventive maintenance activity is a cost effective means of prolonging the life of bituminous pavements

2

Objectives of Crack Treatment

• Rout & Sealing prevents the intrusion of water and objects into cracks

Benefits of Proper and Timely Crack Treatment

• Extends pavement service life by:- maintaining greater pavement support- delaying rate of deterioration of existing cracks

3

Crack Cutting

Generally Manitoba uses two rout & seal configurations:4:1 40mm wide 10mm deep3:1 30mm wide 10mm deep

Routing Profile

4

Testing of Hot Pour Materials for Approved list

5

Specifications:Shall meet a modified ASTM D 3405 low modulus specification

Physical Requirement SpecificationPenetration @ 25º C 110 min - 150 max Flow @ 60º C, mm 3 max.Bond @ -29º C, 200% extension (12.7mm specimen) pass 3 cyclesResilience (ASTM D3407) 60% min.Asphalt Compatibility (ASTM D3407) Pass all requirementsExtended heating @ PouringTemp., 6 hours Pass all requirements

6

Crack Cleaning and Drying

• provide a clean, dry crack channel, free of dirt and dust, which material can properly adhere to

Crack Filling Application

7

Crack Finishing

Performance Evaluation

8

Failure

Thank You Prepared by: Vic WeselakManager Special OperationsManitoba Transportation &Government [email protected]

Preventative Maintenance Practices in the City of Winnipeg 1

3/16/01 Public Works Department Streets Maintenance Division

1

Preventative Maintenance Practices in the City of Winnipeg

Ken BoydSupport Services Engineer


2

Types of Practices PerformedJoint and crack sealing program

Thin bituminous overlay (TBO) program



3

Joint & Crack Sealing

Concrete Pavements (PCC)

Asphalt over Concrete Pavements (APC)

Asphaltic Concrete Pavements (AC)


4


Concrete pavements (PCC).• Joints sealed when constructed.• 2 year warranty for contracts.• Cleaned and resealed at 10-15 years.• Seal cracked slabs at same time.• Resealed as required (ideally every 7 years).



5


Asphalt over concrete pavements (APC)• 1 year reflective • 3 year reflective• Resealed as required (7 years ideally)


6


Asphaltic concrete pavements (AC)• 2 year warranty seal on new pavements• Reseal as required - ideally every 7 or 8

years



7

Joint & Crack Sealing Program

Products• Hot pour, rubberized asphalt sealant• Low modulus (modified ASTM 3405)• Used for both concrete and asphalt pavements--------------------------------------------------------------------• Polyurethane sealants• Used for utility cut and isolated concrete repairs


8

TBO ProgramIdentifying a TBO street by condition

• Structurally sound concrete surface • Minor concrete repairs required (<15% of joints) or

majority of concrete restorations are completed• Grade lines are generally good, not requiring massive fills

to correct• No major amounts of random cracking or faulting• Surface condition requires renewing or sealing due to

wear / spall / joint deterioration or poor drainage



9

TBO Program

Identifying a TBO street by use• Non-regional, collector or high use residential• A residential with front approaches• A residential with a back lane

Additional priority concerns include:Additional priority concerns include:• Area works and recommendations• Resident complaints• Councilors concerns


10

TBO - Scaled Surface



11

TBO - Drainage


12

TBO – Spalled Joints

The Beginning



13

TBO- Spalled Joints


14

TBO – Spalled Joints



15

TBO – Sunken Crown


16

Joint repairs



17

Joint repairs


18

Completed TBO



19


20

Budget

Joint & crack sealing• 6.5% of summer program budget

TBO• 15% of summer program budget• Inventory of candidates totals over 900 kilometers• Estimated cost to TBO is $65M• Replacement cost is $660M

Asset management



21

Summary

Winnipeg has 2 preventative maintenance treatments

• Joint & crack Sealing• TBO

Future• Use Asset Management

– Program (where)– Funding($$$$)

Sask Highways 3/16/01

Pavement Preventative Maintenance and Preservation Briefing Tour 1

22/02/2001 1

Pavement Preventative Maintenance and Preservation Briefing Tour

22/02/2001 2

Introductionn Saskatchewan Highways and

Transportation Pavement Maintenance and Preservation Strategies

n Ted Stobbs Preservation Engineer, Regina

n Gordon King Director of Preservation Services, Prince Albert



22/02/2001 3

Background

n Traditionally the program has been delivered by a mix of department crews and private contractors.

n Most of the treatments discussed today have been used to some extent in Saskatchewan.

22/02/2001 4

Maintenance Management Prior to 1995

n “MAINTENANCE” program managed locally on an allotment basis

n “REHABILITATION” program managed provincially on a condition basis



22/02/2001 5

ASSET MANAGEMENT SYSTEM

n Two Components u Surface Management System

F implemented in 1996u Maintenance Management System

F implementation to be completed in 2001

22/02/2001 6

Surface Management System n

n Two Objectivesu To determine a maintenance and

rehabilitation strategy that minimizes the long term agency cost of maintaining the asset in a defined condition.

u To predict the cost of applying specific treatments as well as the resulting conditions after the treatments were applied.



22/02/2001 7

Maintenance Management System

n A SYSTEMATIC WAY OF MANAGING MAINTENANCE

n By:u PLANNINGu ORGANIZINGu SCHEDULINGu REVIEW/EVALUATE

22/02/2001 8

What This Meansn

budgets can be based on current conditions, technologies and related construction activities.

n The Department can set performance benchmarks for preservation activities and compare benchmarks to actual results.



22/02/2001 9

Next Steps

n Complete implementation of the Maintenance Management System

n Continue to enhance the Surface Management System

n Continue to integrate the Department strategic direction into the two systems.

pavement maintenance and rehabilitation strategies · pavement maintenance and rehabilitation...

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