presentation by: •bill weiss, p.e. - airtap · •presentation by: •bill weiss, p.e....
TRANSCRIPT
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• Presentation by: • Bill Weiss, P.E.
• September 29, 2009
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Expanding the Realm of Possibility
Pavement Management defined Why consider Pavement Management Mn/DOT’s Airport Pavement Management System Airport Report contents Observations
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Expanding the Realm of Possibility
A systematic and objective approach used to: Track pavement inventory
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Expanding the Realm of Possibility
A systematic and objective approach used to: Track pavement inventory Assess the condition of a pavement network
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Expanding the Realm of Possibility
A systematic and objective approach used to: Track pavement inventory Assess the condition of a pavement network Identify current and projected repair needs
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Expanding the Realm of Possibility
A systematic and objective approach used to: Track pavement inventory Assess the condition of a pavement network Identify current and projected repair needs Develop a prioritize repair strategy with the objective of
optimizing spending
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Expanding the Realm of Possibility
A systematic and objective approach used to: Track pavement inventory Assess the condition of a pavement network Identify current and projected repair needs Develop a prioritize repair strategy with the objective of
optimizing spending It is a network level planning tool
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Expanding the Realm of Possibility
The main objective for any Pavement Management System is to apply the right treatment, at the right time, to the right pavement.
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Expanding the Realm of Possibility
The Pavement Management System is NOT intended to: Replace the sound engineering judgment of decision
makers (black box syndrome) Provide detailed design information
Network-level vs. Project-level Remain a static database Provide a “worst first” management approach for project
selection
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Expanding the Realm of Possibility
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Expanding the Realm of Possibility
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Expanding the Realm of Possibility
Pavement Condition Index (PCI) Prepare Maintenance and Repair (M&R) budget scenarios
Maintenance work plans (crack sealing, patching, etc) Type of repair, location, quantity, cost
General CIP budget requirements state level individual airport approx. project $ need
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Expanding the Realm of Possibility
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
2014 2015 2016 2017 2018
Perc
ent A
rea
by P
CI R
ange
Year
PCI 86 -100
PCI 71 - 85
PCI 56 - 70
PCI 41 - 55
PCI 26 - 40
PCI 11 - 25
PCI < 10
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Expanding the Realm of Possibility
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Expanding the Realm of Possibility
Pavements represent a huge capital investment Economic environment
Make best use of every dollar spent Cost-effective approach for tracking critical infrastructure
Constant state of deterioration Accountability and stewardship
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Expanding the Realm of Possibility
Satisfy Federal grant assurances Public Law 103-305 “effective maintenance management system”
Pavements constructed or repaired using Federal funds
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Expanding the Realm of Possibility
Maximize serviceability, minimize cost Pay-me-now-or-pay-me-later proposition Three main approaches:
Ad hoc – based only on past practice Present condition – only one repair type
considered Life cycle - balance available money against
predicted condition
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Expanding the Realm of Possibility
All pavements deteriorate with time
Preventive maintenance extends pavement life
Major repairs become necessary when serviceability is no longer acceptable
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Expanding the Realm of Possibility
Pavement in poor condition costs more to repair than pavement in good condition
Pavement often remains in good condition until near the end of its service life
Ideal time to repair is near the end of a pavement’s service life but before major deterioration takes place
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Expanding the Realm of Possibility
Excellent
Failed Age
Critical PCI Level
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Expanding the Realm of Possibility
Contains 102 airports (over 82,000,000 SF of pavement) Has been periodically updated since early 1990’s ARA is in 2nd year of a 3-year update cycle
Approximately 1/3 of the airports are inspected each year Data resides in a pavement management software called
“MicroPAVER”
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Expanding the Realm of Possibility
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Expanding the Realm of Possibility
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Expanding the Realm of Possibility
Collect sources of pavement history information Construction project information since last inspection Past engineering reports Maps, aerials
Seeking: Year of construction/maintenance Layer characterization (type, thickness) Project limits Design details
Begin contacting airports regarding pavement inspections
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Expanding the Realm of Possibility
Network Group of related pavements Entire airfield
Branch Readily identifiable piece of pavement Usually referred to by name
• "Runway 17-35" • "Taxiway A"
Section Pavement with similar history, structure, condition, and traffic
Recommendations of APMS at this level
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Expanding the Realm of Possibility
RY1533 – Runway 15/33 PTA – Parallel Taxiway A PPTA – Partial Parallel A CTB – Connector Taxiway B CTB2X – Connector Taxiway B2 extended TLA – Taxiway Lane A APA – Apron A RTA – Runway turn around or warm-up pad
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Expanding the Realm of Possibility
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Expanding the Realm of Possibility
Visual inspection of the pavement surface FAA (AC 150/5380-6A) and ASTM (D5340) standards
(Pavement Condition Index – PCI) Based on distress (deterioration) Repeatable
Assessment of the current condition Impact on operations Structural integrity
Will be used to predict future condition (PCI)
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Expanding the Realm of Possibility
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Expanding the Realm of Possibility
Asphalt Distresses Alligator Cracking
Bleeding Block Cracking
Corrugation Depression
Jet Blast Joint Reflection Cracking
L&T Cracking Oil Spillage
Patching Polishing
Weathering/Raveling Rutting Shoving Slippage Swelling
Concrete Distresses Blow Up
Corner Break LT&D Cracks D-Cracking
Joint Seal Damage Small Patches Large Patches
Popouts Pumping Scaling
Settlement Shattered Slab
Shrinkage Cracks Joint Spall
Corner Spall
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Expanding the Realm of Possibility
Asphalt Distresses Alligator Cracking
Bleeding Block Cracking
Corrugation Depression
Jet Blast Joint Reflection Cracking
L&T Cracking Oil Spillage
Patching Polishing
Weathering/Raveling Rutting Shoving Slippage Swelling
Concrete Distresses Blow Up
Corner Break LT&D Cracks D-Cracking
Joint Seal Damage Small Patches Large Patches
Popouts Pumping Scaling
Settlement Shattered Slab
Shrinkage Cracks Joint Spall
Corner Spall
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Expanding the Realm of Possibility
Inspectors walk the pavement Golf cart to move around airfield
Monitor UNICOM frequency Work on a “give way” basis
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Expanding the Realm of Possibility
Organizing and summarizing data collected during data collection (Tasks 1 and 2).
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Expanding the Realm of Possibility
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Expanding the Realm of Possibility
Develop/review the following decision models: PCI prediction models (future PCI) Critical PCI levels Priority matrix (which pavements are more important) Maintenance policies (what to do when) Unit costs for M&R treatments
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Expanding the Realm of Possibility
Developed from historical pavement data and measured PCI
Group together pavement “families” Used to estimate future PCI (not distress)
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Expanding the Realm of Possibility
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Expanding the Realm of Possibility
Near Term Maintenance (within 1 year from inspection) Crack sealing, patching, surface treatments, etc.
PCI does not return to 100 Slow pavement deterioration Performed annually
Major Rehabilitation (projected 5-year plan) “Level” of work equivalent to overlays or reconstructs
PCI returns to 100 Next step is CIP collaboration; further study to determine
“Type” of work
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Expanding the Realm of Possibility
Estimate of work quantities and costs reported: By pavement section By treatment type
Most cost-effective if applied to pavements in generally good condition PCI > 50 Little or no structural distresses
Compare with CIP for that area of pavement Adjust unit cost of treatments to local values Work quantities are time sensitive (valid for 1 year from
inspection)
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Identifies sections in need of substantial repairs Compare to CIP for airport Future project-level study
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A – Airport maps B – Pictures C – PCI Distress Report D – PCI Distress Identification E – Maintenance and Major Rehabilitation Policies F – Localized Maintenance Recommendations G – Maintenance Repair Guidelines
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• (Last page of report)
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surface treatment
PCI = 84
no surface treatment
PCI = 33
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• If you choose to perform Maintenance, this is the annual cost
• If you choose to perform Major Rehabilitation, find projected PCI for section above, find unit cost for that PCI level (table 5); multiply unit cost x area of section = project cost
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• Major M&R for CTA-02 & APA-02 (year 1) • Major M&R for APB-01 (year 3)