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

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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

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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?

rghicks@csuchico.edu

530-588-4446

and

dxcheng@csuchico.edu

530-588-0155

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www.cp2info.org/Center