gary hicks and rob marsh april 19, 2005
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Pavement Preservation Sub-Group on Strategy Selection & Evaluation. Gary Hicks and Rob Marsh April 19, 2005. Pavement Preservation (PP) – What is it?. Sum of all activities to provide and maintain serviceable roadways Corrective & Preventive Maintenance (30mm) - PowerPoint PPT PresentationTRANSCRIPT
Gary Hicks and Rob MarshGary Hicks and Rob Marsh April 19, 2005April 19, 2005
Pavement Preservation Sub-Group Pavement Preservation Sub-Group
on Strategy Selection & Evaluationon Strategy Selection & Evaluation
Pavement Preservation (PP) – Pavement Preservation (PP) – What is it? What is it?
Sum of all activities to provide and Sum of all activities to provide and maintain serviceable roadwaysmaintain serviceable roadways Corrective & Preventive Maintenance Corrective & Preventive Maintenance
(30mm)(30mm) Minor & Major Rehab (CAPM)Minor & Major Rehab (CAPM)
SHOPP delay is pavement preservationSHOPP delay is pavement preservation
Time or TrafficTime or Traffic
ConditionCondition
Pavement Preservation ConceptPavement Preservation Concept
RehabilitatioRehabilitation Triggern Trigger
Preventive Preventive TriggerTrigger
Original Original PavementPavement
Optimal Optimal TimingTiming
PPTG- Sub-group on Strategy PPTG- Sub-group on Strategy Selection & EvaluationSelection & Evaluation
Overall GoalsOverall Goals
Work ActivitiesWork Activities
Approach for selecting Approach for selecting maintenance maintenance treatmentstreatments
LCCA approachLCCA approach
Training Training RecommendationsRecommendations
SummarySummary
Overall Sub-group Goals Overall Sub-group Goals
Verify when and where to Verify when and where to
use various PP strategies use various PP strategies
based on current pavement based on current pavement
condition datacondition data
Show the cost effectiveness Show the cost effectiveness
for the various strategies for the various strategies
based on LCCAbased on LCCA
Provide training Provide training
recommendationsrecommendations
Work Activities – General Work Activities – General ScopeScope
Limit initial work to implemented Limit initial work to implemented
Caltrans strategiesCaltrans strategies
Identify costs for each strategy Identify costs for each strategy
(make sure we know what is included (make sure we know what is included
in the cost data)in the cost data)
Identify when and where a particular Identify when and where a particular
strategy is appropriate and most cost strategy is appropriate and most cost
effectiveeffective
Typical Caltrans Typical Caltrans TreatmentsTreatments
Seals (Fog, Slurry, Seals (Fog, Slurry, Chip)Chip)
Crack Seal/FillCrack Seal/Fill Micro-SurfacingMicro-Surfacing Thin HMA Thin HMA
OverlaysOverlays Bonded Wearing Bonded Wearing
CourseCourse Surface recyclingSurface recycling
Crack & Joint SealCrack & Joint Seal Partial & Full Partial & Full
Depth RepairDepth Repair Under-sealingUnder-sealing Dowel Bar RetrofitDowel Bar Retrofit Diamond Grinding Diamond Grinding
& Grooving& Grooving
ACAC PCCPCC
MTAG– MTAG– www.dot.ca.gov/hq/maint/MTA_guide.htmwww.dot.ca.gov/hq/maint/MTA_guide.htm
Benefits of PP TreatmentsBenefits of PP Treatments
Life Extension of the existing Life Extension of the existing pavementpavement
Reduced noise, depending on Reduced noise, depending on the treatmentthe treatment
Improved ride qualityImproved ride quality
Improved skid resistance and Improved skid resistance and safety (reduced splash & spray)safety (reduced splash & spray)
Reduce user delaysReduce user delays
Life ExtensionLife Extension
DefinitionDefinition Factors affecting life extensionFactors affecting life extension
Condition of existing pavementCondition of existing pavement ClimateClimate TrafficTraffic Timing of treatmentTiming of treatment
Validation of life extensionValidation of life extension
PMS Data Point
VeryGood
Good
Fair
Poor
VeryPoor
Time (Years)
PMS Data Point
Measured Life Extension
Definition of Life Definition of Life ExtensionExtension
Tools to Validate life Tools to Validate life extensionextension
Pavement condition-Type, extent and Pavement condition-Type, extent and severity of distressseverity of distress
Condition prior to treatmentCondition prior to treatment At time of selectionAt time of selection At time of constructionAt time of construction
Condition after constructionCondition after construction BaselineBaseline At various intervalsAt various intervals
For PP treatments, the acceptable For PP treatments, the acceptable level of existing distress should be level of existing distress should be smallsmall
Selecting Maintenance Selecting Maintenance Treatments-The Caltrans Treatments-The Caltrans approachapproach
Factors consideredFactors considered Existing pavement conditionExisting pavement condition TrafficTraffic ClimateClimate Geography/TopographyGeography/Topography
11stst Caltrans Approach- MTAG Caltrans Approach- MTAG (flexible pavements only)(flexible pavements only)
evaluates applicability of various CT PP treatments
based upon existing pavement condition and environmental factors
Developed in 2003
MTAG Version 2003MTAG Version 2003
22ndnd Caltrans Approach- Caltrans Approach-2004 Maintenance Directive2004 Maintenance Directive
Guidelines for Successful Maintenance Treatments Basis for CT Major Maintenance Program
annual contract maintenance program evaluated applicability of various CT PM’s comparison based upon pavement condition and environmental factors evaluates applicability based upon type of distress condition as well as extent of cracking
Maintenance Directive Maintenance Directive 2004 2004
Page 1 of 2Page 1 of 2
Maintenance Directive Maintenance Directive 2004 2004
Rutting
Treatment
Raveling
Oxidation
Bleeding
<1/2"
>1/2"
Urban
Rural
Slurry Seals
Type II (See note 1) F G N N N G G
Type III G G N F N G G
Chip Seal
PME - Med. Fine G G N F N P G
PME - Medium G G N F N P G
PMA -Medium (See Note 3.) G G N F N P G
PMA - Coarse (See Note 3.) G G N F N P G
AR - Medium G G N F N P G
AR - Coarse G G N F N P G
Maintenance Directive 2004Maintenance Directive 2004General Guidelines for Effective Treatments on General Guidelines for Effective Treatments on
CracksCracks
Page 2 of 2Page 2 of 2
Maintenance Directive 20004 Maintenance Directive 20004 General Guidelines for Effective Treatments on CracksGeneral Guidelines for Effective Treatments on Cracks
Page 2 of 2Page 2 of 2
Alligator "C" Longitudinal/Transverse
Criteria Low Medium High Low Medium High
Width <1/4">1/4", <1/2" >1/2" <1/4"
>1/4", <1/2" >1/2"
or or or
Area <10%>10%, <20%
>20%, <30%
Treatment
Microsurfacing
Type II (See note 2) F P N F N N
Type III F P N F N N
PM Alternative
Conventional OGAC G F (See Note 4)
N G F P
PBA OGAC G F (See Note 4)
N G F P
AR OGAC G G F G F P
AR OGAC High Binder (HB) G G F G F P
Gap Graded RACOL G G G G F P
Thin Bonded Wearing Course (BWC)
G G F F F P
Differences Between Approaches and Recommendations
Differences the treatment and consideration of cracking.
a second page added to the Matrix.
fluctuations in the Costs/Lane-mile and life expectancy of treatments.
Recommendations
As the 2004 MTCE Directive is the current basis for the Contract Maintenance program, its’ decision matrix should be the selected version.
LCCA- an Approach to Cost LCCA- an Approach to Cost EffectivenessEffectiveness
DefinitionDefinition ElementsElements Proposed approachProposed approach Expected resultsExpected results
LCCA (Definition)LCCA (Definition)
Allows comparison of two or Allows comparison of two or more alternatives on a rational more alternatives on a rational economic basiseconomic basis
Initial and future costs Initial and future costs considered together with considered together with expected pavement expected pavement performanceperformance
Example of CostsExample of Costs
ExcellenExcellentt
FaileFailedd
Time or TrafficTime or Traffic
ConditioConditionn
$1 to $2/yd$1 to $2/yd22
$5 to $8/yd22
LCCA Elements for HMA LCCA Elements for HMA PavementsPavements
Type and life of Maintenance and Type and life of Maintenance and
rehabilitation treatmentsrehabilitation treatments
Agency costsAgency costs
User costs (auto repairs, safety, delays)User costs (auto repairs, safety, delays)
Salvage valueSalvage value
Time value of money (present net value vs. Time value of money (present net value vs.
annual cost)annual cost)
Data NeedsData Needs
Determine lives (or life extension) Determine lives (or life extension)
of pavement preservation of pavement preservation
treatmentstreatments Determine costs of typical Determine costs of typical
maintenance and rehabilitation maintenance and rehabilitation costs costs
In lieu of actual data, use best In lieu of actual data, use best
estimates of life of treatment and estimates of life of treatment and
life extensionlife extension
Estimated Life of TreatmentEstimated Life of Treatment
TreatmenTreatmentt
Good Good Condition Condition (PCI=80)(PCI=80)
Fair Fair Condition Condition (PCI=60)(PCI=60)
Poor Poor Condition Condition (PCI=40)(PCI=40)
Fog SealFog Seal 3 - 53 - 5 1 - 31 - 3 1 - 21 - 2
Chip SealChip Seal 7 - 107 - 10 3 - 53 - 5 1 - 31 - 3
Slurry Slurry SealSeal
7 - 107 - 10 3 - 53 - 5 1 - 31 - 3
Micro-Micro-surfacingsurfacing
8 - 128 - 12 5 - 75 - 7 2 - 42 - 4
Thin HMAThin HMA 10 - 1210 - 12 5 - 75 - 7 2 - 42 - 4
LCCA Analysis ApproachesLCCA Analysis Approaches
LCCA Model can be run in two modesLCCA Model can be run in two modes Single best estimates of inputsSingle best estimates of inputs
Produces single estimate of costProduces single estimate of cost““Deterministic”Deterministic”
Range of estimates for each inputRange of estimates for each inputProduces distribution of costsProduces distribution of costsA means to address uncertaintyA means to address uncertainty““Probabilistic”Probabilistic”
Example of Savings Example of Savings Associated with Using PP Associated with Using PP TreatmentsTreatments
FacilityFacility AlternatAlternatee
LCC (NPV), LCC (NPV), $/sy$/sy
% % SavingsSavings
City City StreetsStreets
A – A – ReconRecon
21.0821.08 14.614.6
B – PMB – PM 18.4018.40
Rural Rural HighwayHighwayss
A – A – ReconRecon
36.4436.44 17.017.0
B – PMB – PM 31.1431.14
Major Major HighwayHighwayss
A – A – ReconRecon
70.8070.80 76.976.9
B - PMB - PM 40.0240.02
SummarySummary
Goals of subgroupGoals of subgroup Work activitiesWork activities Approach for selecting Approach for selecting
treatmentstreatments Approach for performing LCCAApproach for performing LCCA Training recommendationsTraining recommendations
Action items-Treatment Action items-Treatment SelectionSelection
Treatment selection process for Treatment selection process for
flexible pavements- flexible pavements- Draft completedDraft completed
Treatment selection process for Treatment selection process for
rigid pavements_rigid pavements_To be developedTo be developed
Recommended Training based on Recommended Training based on
aboveabove
Action items-LCCAAction items-LCCA
Cost data for treatments- 3Cost data for treatments- 3rdrd Quarter Quarter 20052005
Expected life of treatments- 3Expected life of treatments- 3rdrd Quarter 2005Quarter 2005
LCCA approach- 3LCCA approach- 3rdrd Quarter 2005 Quarter 2005 Complete initial LCCA studies- Early Complete initial LCCA studies- Early
20062006 Recommended Training Program – Recommended Training Program –
Following completion of aboveFollowing completion of above
Recommended Training aidsRecommended Training aids
MTAG-FHWA is putting it on the MTAG-FHWA is putting it on the webweb
Data needs and collection Data needs and collection proceduresprocedures
Treatment Selection processTreatment Selection process LCCA approachLCCA approach
MTAG– MTAG– www.dot.ca.gov/hq/maint/MTA_guide.htmwww.dot.ca.gov/hq/maint/MTA_guide.htm