Gary Hicks - Pavement Preservation Strategies
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Transcript of Gary Hicks - Pavement Preservation Strategies
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Strategy Selection Process Developed by the CP2 Center
By R. Gary Hicks and Ding Cheng
CP2 Center, CSU, Chico for the
Spring California Asphalt Pavement Conference
April 9-10, 2014
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• Types of TreatmentsTypes of Treatments• Strategy Selection Strategy Selection
ProcessProcess• Case StudiesCase Studies• Summary and Summary and
recommendationsrecommendations
Much of this work has been supported by Caltrans
Overview of Presentation
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Co
nd
itio
n
Time
$1-3 for preventive
maintenance here
Costs $10-20 or more when it’s done as rehab
Cost Effectiveness Pavement Preservation
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What is Treatment Selection?
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A guide to assist maintenance personnel in making better and more informed decisions in selecting and applying maintenance treatments
In other words…
What do we do with this?
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Treatment Selection Based on Pavement Condition
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Issues Treatment Selection Addresses
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• Will the treatment address the distresses present? (i.e., Will it work?)
• Can the required preparation for the treatment be carried out?
• Is the treatment cost effective?
• Will the treatment be performed before the situation being addressed changes?
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Strategy Selection Process
• Assess Pavement Conditions
• Determine Feasible Treatment Options
• Analyze and Compare Feasible Options
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Assess Current Conditions
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• Assess Existing Pavement Conditions– Conduct visual site inspection and/or
review project information– Perform testing on the existing pavement,
as conditions require– Define the performance requirements for
the treatment
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Fatigue (Alligator) Cracking
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LOW MODERATE HIGH
Load Related, HMA Thickness
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Rutting and Depressions
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Ruts in Wheel Paths Depression
Load + Environmental
Typically Upper 4 in.
Support IssueTypically Full Depth
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Transverse and Block Cracking
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Thermal Cracking Block Cracking
EnvironmentalEarly in Pave. Life
Environmental + Age
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Factors Affecting Treatment Selection
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• Pavement age and condition
• Climate
• Traffic levels, expected future plans
• Available funding
• Agency policy
• Availability of Contractors
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Treatment Selection Matrix
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• Covers all the major treatment types currently used by Caltrans for flexible pavements and allows for inclusion of future strategies
• Treatment selection is a complex, yet important procedure to ensure a optimum pavement treatment
• CP2 Center has developed a
program to do this for you
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User Interface – Main Page
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•Treatment Life•Treatment Cost•Interest Rate
Equivalent Annual Cost
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Advantage of the Preliminary Developed Expert System
• Uses Caltrans MTAG existing decision matrix
• Can deal with more complex scenarios?• Knowledge is retained to the system• New treatments and costs can be added at
any time
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Case Histories Provided by LA County
• Information needed:– Type and extent of
distress prior to treatment – Traffic level, ADT or TI– Climate or environment
region– Cost and estimated
treatment life
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Imperial Highway – Shoemaker Avenue/Valley View Avenue (RD 446)
• PCI of 57 (Evaluation Date: 8/29/2011)
• Predominant distresses consist of 40% moderate alligator cracking
• Traffic Index = 10
• Environment Region- South Coast Mediterranean climate
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Imperial Highway
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Overhill Drive – Slauson Avenue/Stocker Street (RD 233)
• PCI of 59 (Evaluation Date: 4/16/2013)
• Predominant distresses consists of 10% slight alligator and 50% slight map cracking
• Traffic Index= 7
• Environment Region- South Coast Mediterranean climate
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Overhill Drive
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Via Marina – Washington Street/1727 Bora Bora Way (RD 433)
• PCI of 73 (Evaluation Date: 10/27/2011)
• Predominant distresses consists of 30% slight map cracking
• Traffic Index = 8
• Environment Region- South Coast Mediterranean climate
•
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Via Marina
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What Strategy Would be Best for Each Case?
• Imperial Highway- Heavy cracking and traffic
• Overhill-Medium cracking and intermediate traffic
• Via Marina-Light cracking and traffic
http://ceresearch.ecst.csuchico.edu/TreatmentSelection2.0/View/LoginPage.aspx
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Imperial Highway
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Overhill Drive
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Via Marina
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Discussion of Results
• Projects– Imperial Highway
– Overhill Drive
– Via Marina
• Alternatives– Preservation
– Rehab
– Reconstruction
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Summary
• Types of Surface Types of Surface TreatmentsTreatments
• Strategy Selection Strategy Selection Process Using Life Process Using Life Cycle Cost Cycle Cost
• Case HistoriesCase Histories• Aids in making Aids in making
better decisionsbetter decisions29
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For More Information
• Check with Ding Cheng, the developer of the program
• The Center can provide training on the use of the program
• We can also customize it to fit your needs
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Any Questions?
530-588-4446
and
530-588-0155
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www.cp2info.org/Center