asphalt pavement: management and rehabilitation · asphalt pavement: management and rehabilitation...
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Asphalt Pavement: Management and Rehabilitation
PWR May 23, 2018 Weatherford/ UTA 1
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Learning Objectives
Overview of pavement asset management Applicability of Paver software Optimization of asphalt rehabilitation
options
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Road Map
Overview of a pavement asset management plan using the Pavement Condition Index (PCI)-(Khankarli, UTA)
Overview of applicability of PCI to the City of Weatherford pavement asset management program-(Leppla, Weatherford)
Overview of the Accelerated Pavement Testing (APT) process for HMAC pavement solutions-(Romanoschi/Khankarli, UTA)
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Pavement Asset Management Background:◦ Need to have a systematic approach to prioritize
project needs◦ Need to balance costs, opportunities and risks with
expected performance ◦ Use of an analytical process with a life cycle
component Key benefits:◦ Improved financial performance◦ Improved investments decisions, efficiency and
effectiveness◦ Improved management of risks◦ Improved transparency and compliance
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Pavement Asset Management Key success points:◦ Clear mission/vision◦ Alignment with mission◦ Full integration◦ Full commitment
Organizational goals set the target performance
Applicable standards: ◦ ASTM D6433 ◦ ISO 55000
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Pavement Condition Index (PCI) PCI is the quantitative analysis needed
to develop the optimal solution PCI uses a scale of 0‐100 with 100
being the best It is based on type, severity and extent
of "individual" defects to yield 'deduct‘ points subtracted from 100
A correction factor is used to account for the combination of different distresses
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What do you measure to determine pavementcondition ? Surface Distress◦ Collected by visual survey, Image processing, photo log◦ In practice, the condition is described by quantifying defects: Type Severity Extent
Structural Integrity◦ Falling Weight Deflectometer (FWD)
Ride Quality◦ Observer rating◦ Vehicle Response Meter◦ Profile Measurement
Skid Resistance◦ Portable skid tester◦ Rolling/locked wheel
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Typical SectionFlexible Pavement
G. A. Khankarli
HMAC
Base Course
Subbase /Treated Subgrade
Subgrade
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Pavement Condition Index (PCI)
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Applicability of PCI to the City of Weatherford’s AM Program
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Overview: 189 miles of roadway $1.3M maintenance budget
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Prev. Maint.12%
Full Depth Rehabilitation
31%
Concrete19%
Overlay23%
Misc.15%
$1,300,000.00
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Implementation Why is there a need?◦ Prioritize efforts◦ Develop annual budget◦ Strengthen Community
Pavement Survey Software…Integration with Cityworks
and MicroPaver Day to day maintenance work needs
to reflect O.C.I.PWR May 23, 2018 Weatherford/ UTA 13
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Overall Approximately 6 miles of road maintenance
annually Community Goal: Road Network O.C.I. >65
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Total Segments 1920 (189 Miles)
Full Depth Rehabilitation 0-50 346 18%
Overlay 51-70 330 18%
Preventative Maintenance 71-90 535 28%
Limited Action 91-100 708 37%
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Current Pavement Condition
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USE of APT for Optimal HMAC Solutions Standard approach◦ Trial/error◦ “This is how we have done it in the past”
APT concept: APT is generally defined as “a controlled application of a realistic wheel loading to a pavement system simulating long-term, in-service loading conditions”.
APT advantage: ◦ It uses of a test track with actual traffic and/or a specialized
load frame that applies an adjustable weighted load in a linear or circular setup.
◦ It allows the monitoring of a pavement system’s performance and response to accumulation of damage within a short time frame.
Can be customized to locality through field testing prior to implementation of the conceptual solutions
This ws for cost savings realization
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USE of APT for Optimal HMAC Solutions Standard approach◦ Trial/error◦ “This is how we have done it in the past”
APT concept: APT is generally defined as “a controlled application of a realistic wheel loading to a pavement system simulating long-term, in-service loading conditions”.
APT advantage: ◦ It uses of a test track with actual traffic and/or a specialized
load frame that applies an adjustable weighted load in a linear or circular setup.
◦ It allows the monitoring of a pavement system’s performance and response to accumulation of damage within a short time frame.
Cost savings realization Can be customized to locality through field testing prior
to implementation
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USE of APT for Optimal HMAC Solutions
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Example Savings on a TxDOT Project Experiment : Evaluated the fatigue cracking, reflection
cracking and rutting resistance of four asphalt surface mixes: one with no recycles material, one with 19% RAP, one with 15%RAP and 3%RAS and one mix with 15%RAP and 3%RAS but designed with the Balance Mix Design (BMD) concept
Value: Since approximately 10 million tons of HMA with RAP/RAS is placed every year in TxDOT projects, at an average cost of $70 per ton, only a 5% performance increase of these mixes due to the implementation of the research findings from this project brings an estimated 35 million dollars in annual savings to TxDOT
This approach may result in further optimization of the use of your resources
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Summary Using an integrated Asset Management
program will help optimize use of scarce resources while providing longer performing pavements
Use of an APT customization approach will help you with the optimized use of your scarcely available funds
A pooled effort can be used to perform the APT test
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Q & A
THANK YOU!
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Other References North Central Council of Governments (NCTCOG).
2017. Standard Specifications. NCTCOG Texas Department of Transportation (TxDOT). 2014.
Standard Specifications for Highways and Bridges. TxDOT
ASTM D 6433, 2013, Standard Practice for Roads and Parking Lots Pavement Condition Index Surveys.ASTM International, West Conshohocken, PA
BSI ISO 55000, 2015. Asset Management: Overview, Principles and Terminology. BSI Standards Limited, Geneva, Switzerland
PAVER Asphalt Distress Manual, US Army Construction Engineering Laboratories, TR 97/104, June 1997.
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