Presentation by Bill Morgan, Deputy Director, County of San Diego Dept. of Public Works Department, on the steps the County of San Diego is taking to address dwindling aggregate resources in the region through increased recycling measures in their pavement program. Presentation delivered at the CalAPA Spring Asphalt Pavement Conference, held March 20-21, 2019 in Ontario, CA.

1. CALAPA 2019
SPRING CONFERENCE
March 20,
2019

2. Why is this important
AGENDA
San Diego County – Overview and Current
Program
Building Better Roads Working Group
Key Findings of the Working Group
Next Steps

3. WHY IS THIS IMPORTANT
 Facilitate improving relationship between
industry and government
 Identify and implement cost-effective
and environmentally sustainable
solutions to build better roads for
San Diego County
 Increase use of recycled materials to
offset shrinking supply of local aggregate
resources
 SB-1: incorporate technology & recycling
techniques that lower GHG and reduce
costs of maintaining local road through
material choice and construction
methods
Active Production Sites in San Diego County
49 48
24
21
14
11
5
0
10
20
30
40
50
60
1970 1980 1995 2004 2005 2010 2030
Source: USGS Minerals Yearbook, California Department of Conservation Special Report 153, 1982 and DMG
OFR 96-04, 1996; and operator Reclamation Plan files.
NumberofActiveMines

4. WHY IS THIS IMPORTANT
1
2
Form a working group comprised of industry associations, public
agencies, and County staff to identify innovative and cost-effective
pavement preservation treatments to be used on County roads.
Form Working Group
Return to the board within 180 days with recommendations based
on the findings of the Working Group.
Report Back

5. WHY IS THIS IMPORTANT
WHO USES CONSTRUCTION AGGREGATE?

6. WHY IS THIS IMPORTANT
Aggregate Sustainability in California?

7. WHY IS THIS IMPORTANT
PRODUCTIONVS DEMAND SUMMARY

8. WHY IS THIS IMPORTANT

9. CURRENT PROGRAM
OPTION 3

10. CURRENT PROGRAM
OVERVIEW
• Thin layers of asphalt emulsion and
aggregate placed on existing road
• Protects and preserves existing road
surfaces
• Can include ground up rubber from
recycled tires
BENEFITS
• Preserves road in good condition
OVERVIEW
• New asphalt placed over older
deteriorated asphalt
• Can include ground up rubber from
recycled tires
• Can include RAP in place of new
sand and rock
BENEFITS
• Restores roads to good condition
OVERVIEW
• Complete removal and replacement
of deteriorated asphalt road
• Utilize RAP and recycled concrete in
new road
• Cold-in-place recycling process used
on county roads
BENEFITS
• Reduced cost and impacts
ASPHALT OVERLAYSURFACE SEALS FULL RECONSTRUCTION
PRESERVE RESTORE REBUILD

11. CURRENT PROGRAM
OVERVIEW
• Asphalt emulsion and aggregate
• Fog, slurry, chip, scrub, Cape,
• Polymers and tire rubber
BENEFITS
• Protect and reserve good roads
OVERVIEW
• New asphalt
• Overlay, mill& fill
• Conv., MAC’s, and polymer blends
• Tire rubber and RAP
BENEFITS
• Restores old road to good condition
OVERVIEW
• Remove and replace deteriorated
asphalt road
• Conventional, CIPR, FDR
• RAP
BENEFITS
• Reduced cost and impacts
ASPHALT OVERLAYSURFACE SEALS FULL RECONSTRUCTION
PRESERVE RESTORE REBUILD

12. CURRENT PROGRAM
SCRAP TIRES
RECYCLED ROAD BASE RECLAIMED ASPHALT PAVEMENT (RAP)
RECYCLED MATERIALS

13. VISION
1
2
Form a working group comprised of industry associations, public
agencies, and County staff to identify innovative and cost-effective
pavement preservation treatments to be used on county roads.
Form Working Group
Develop findings in the form of reports to share with our industry
and agency partners in the San Diego region.
Provide Solutions for all Stakeholders in San Diego County

14. BUILDING BETTER ROADS WORKING GROUP

15. OUR GOALS
Employ a regional
approach to addressing
our roadway needs
BETTER ROADS WORKING GROUP
Engage all stakeholders to
identify innovative, cost-
effective, & viable
solutions
Identify sustainable,
local resources
Develop best practices that
provide environmental
benefits and minimize impacts

16. THE PROCESS
BETTER ROADS WORKING GROUP
• 11 Meetings
• 4 Subcommittees:
• Reclaimed Asphalt Pavement
• Mix Designs for Asphalt
• Alternative PavementTypes
• Contracting Methodology
• Developed reports and guidance
documents

17. BETTER ROADS WORKING GROUP

18. RAP - KEY FINDINGS
OVERVIEW
• Maintain high-quality RAP
• Evaluate storage time limitations
ACTIONS
• Guidance on processing and storage
• Extend storage times
BENEFITS
• High quality roads
• Diversion from Landfills
RAP Processing and Storage
OVERVIEW
• Local agencies allow 15% RAP
• New guidance on increased use of RAP
ACTIONS
• Revise to allow 25% RAP in asphalt
• Pilot 40% RAP asphalt, 100% RAP seals
BENEFITS
• Available, sustainable, cost-effective
• Preserves local aggregate supply
Increase RAP Content

19. MIX DESIGN - KEY FINDINGS
OVERVIEW
• Produced at lower temperatures
• Chemical additives increase cost
ACTIONS
• Evaluate cost and uses
• Pilot project
BENEFITS
• Reduced energy and improved flexibility
Warm Mix Asphalt
OVERVIEW
• Numerous mix designs
• Inefficient asphalt production
ACTIONS
• Evaluate mix design options
• Identify subject matter experts
BENEFITS
• Reduce cost and improve quality
HOT MIX WARM MIX
Standardized Mix Designs

20. MIX DESIGN - KEY FINDINGS
OVERVIEW
• Produced at lower temperatures
• Chemical additives increase cost
ACTIONS
• Evaluate cost and uses
• Pilot project
BENEFITS
• Reduced energy and improved flexibility
Warm Mix Asphalt
OVERVIEW
• Numerous mix designs
• Inefficient asphalt production
ACTIONS
• Evaluate mix design options
• Identify subject matter experts
BENEFITS
• Reduce cost and improve quality
HOT MIX WARM MIX
Standardized Mix Designs

21. ALTERNATIVE PAVEMENTS - KEY FINDINGS
OVERVIEW
• Special concrete blend
• Higher cost
ACTIONS
• Pilot project to evaluate cost and uses
BENEFITS
• Lower maintenance and noise
• Longer life span
Roller Compacted Concrete
OVERVIEW
• Adds synthetic fibers
• Higher cost
ACTIONS
• Pilot project to evaluate cost and uses
BENEFITS
• Improves durability and crack resistance
• May extend pavement life
Fiber Reinforced Asphalt

22. CONTRACTING - KEY FINDINGS
Construction Contract
Improvements
Create Regional
Bidding Calendar
BENEFITS
• Contractor scheduling
• Competition
• Bid opportunities
ACTIONS
• Develop regional bidding
calendar
Increase Use of
Electronic Bidding
BENEFITS
• Real time updates
• Reduce errors
• Increase transparency
ACTIONS
• Procure electronic bid
software
BENEFITS
• Maximize workforce
• Improved efficiency
• Cost savings
ACTIONS
• Pilot project with flexible
start date & improved
traffic control

23. SUMMARY OF ACTIONS: WORKING GROUP
Conduct survey of local agencies to
collect information on contracting
practices and procedures an share best
practices with the region
Survey Local Agencies
Organize regional training sessions
and workshops on pavement
preservation treatments.
Organize Regional Training
NEXT STEPS
Finalize reports and recommendations,
and to identify new and innovative
improvements
Finalize Reports
Develop working group findings for
in technical reports and share with
regional partners
Post Reports Online

24. NEXT STEPS
Increase Allowable Percentage
of RAP to 25% in Asphalt
• Warm Mix Asphalt
• 40% RAP
• 100% RAP Seal
• Reinforced Fiber Pavement
• Roller Compacted Concrete
• Flexible Construction Start
Dates
Work with Local Agencies
and industry
Develop Electronic
Bidding Capabilities
Develop Pilot Projects
• Standard Mix Designs
• RAP Storage Guidance
• RAP Best Practice
• Regional Bid Calendar
• Traffic Control Guidance

25. WHO USES CONSTRUCTION AGGREGATE?
SUMMARY OF REPORTS

26. INDUSTRY RECOGNITION
“A high-profile "Building Better Roads" initiative in San Diego
County, intended to spur innovation and sustainability, results in
a number of changes in local asphalt pavement specifications,
including the utilization of higher percentages of Reclaimed
Asphalt Pavement (RAP) in pavement mixes in response to
rapidly disappearing sources of aggregate in the county. The
initiative is being championed by San Diego County Board of
Supervisors Chair Kristin Gaspar.”
—CaliforniaAsphalt Insider Newsletter, January 7, 2019

27. CALAPA 2019 SPRING CONFERENCE
March 27, 2019
WILLIAM MORGAN, PE, COUNTY ENGINEER
DEPUTY DIRECTOR, ENGINEERING SERVICES
COUNTY OF SAN DIEGO, PUBLIC WORKS
WILLIAM.MORGAN@SDCOUNTY.CA.GOV