gary hicks - pavement preservation strategies
DESCRIPTION
Presentation delivered at the CalAPA Spring Asphalt Pavement Conference April 9-10, 2014 in Ontario. Topic: Pavement preservation strategies, incuding a new software developed by the Pavement Preservation Center at CSU Chico to assist in identifying pavement preservation strategies.TRANSCRIPT
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
• 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
2
3
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
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?
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?
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
Fatigue (Alligator) Cracking
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LOW MODERATE HIGH
Load Related, HMA Thickness
Rutting and Depressions
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Ruts in Wheel Paths Depression
Load + Environmental
Typically Upper 4 in.
Support IssueTypically Full Depth
Transverse and Block Cracking
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Thermal Cracking Block Cracking
EnvironmentalEarly in Pave. Life
Environmental + Age
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
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
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
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
Imperial Highway
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
Overhill Drive
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
•
Via Marina
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
Imperial Highway
Overhill Drive
Via Marina
Discussion of Results
• Projects– Imperial Highway
– Overhill Drive
– Via Marina
• Alternatives– Preservation
– Rehab
– Reconstruction
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
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
Any Questions?
530-588-4446
and
530-588-0155
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www.cp2info.org/Center