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.

1. 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

2. • Types of Treatments
• Strategy Selection
Process
• Case Studies
• Summary and
recommendations
Much of this work has been supported by Caltrans
Overview of Presentation
2

3. 3
Condition
Time
$1-3 for
preventive
maintenance
here
Costs $10-20
or more
when it’s
done as
rehab
Cost Effectiveness Pavement
Preservation

4. What is Treatment Selection?
4
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?

5. Treatment Selection Based
on Pavement Condition
5

6. Issues Treatment Selection
Addresses
6
• 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?

7. Strategy Selection Process
• Assess Pavement
Conditions
• Determine Feasible
Treatment Options
• Analyze and
Compare Feasible
Options
7

8. Assess Current
Conditions
8
• 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

9. Fatigue (Alligator) Cracking
9
LOW MODERATE HIGH
Load Related, HMA Thickness

10. Rutting and Depressions
10
Ruts in Wheel Paths Depression
Load + Environmental
Typically Upper 4 in.
Support Issue
Typically Full
Depth

11. Transverse and Block Cracking
11
Thermal Cracking
Block Cracking
Environmental
Early in Pave. Life
Environmental
+ Age

12. Factors Affecting
Treatment Selection
12
• Pavement age and condition
• Climate
• Traffic levels, expected future plans
• Available funding
• Agency policy
• Availability of Contractors

13. Treatment Selection
Matrix
13
• 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

14. User Interface – Main Page
14

15. •Treatment Life
•Treatment Cost
•Interest Rate
Equivalent
Annual Cost
15

16. 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
16

17. 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

18. 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

19. Imperial Highway

20. 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

21. Overhill Drive

22. 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
•

23. Via Marina

24. 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/Treatment
Selection2.0/View/LoginPage.aspx

25. Imperial Highway

26. Overhill Drive

27. Via Marina

28. Discussion of Results
• Projects
– Imperial Highway
– Overhill Drive
– Via Marina
• Alternatives
– Preservation
– Rehab
– Reconstruction

29. Summary
• Types of Surface
Treatments
• Strategy Selection
Process Using Life
Cycle Cost
• Case Histories
• Aids in making
better decisions
29

30. 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

31. Any Questions?
rghicks@csuchico.edu
530-588-4446
and
dxcheng@csuchico.edu
530-588-0155
31
www.cp2info.org/Center