Presentation by Van Troung, Civil Engineer, on "Los Angeles County's Sustainable Roadway Improvement Program." Presentation delivered at the CalAPA Spring Asphalt Pavement Conference, held March 20-21, 2019 in Ontario, CA.

1. LOS ANGELES COUNTY’S SUSTAINABLE
ROADWAY IMPROVEMENT PROGRAM
VanTruong, Civil Engineer
THE CALIFORNIA ASPHALT PAVEMENT ASSOCIATION
SPRING ASPHALT PAVEMENT CONFERENCE & EQUIPMENT EXPO
LOS ANGELES COUNTY PUBLICWORKS
THURSDAY, MARCH 21, 2019

2. Presentation Objectives
 Overview of County’s Road Network
 County’s Sustainable 3-Prong Approach
 Rehabilitation/Reconstruction Strategy
 Mulholland Hwy Cold In-Place Recycling Project
 Ballentine Place Reconstruction Project

3. 7,300 Lane Miles
(532 Million Square Feet)
137 County Islands
PCI = 65 (Fair)

4. NORTH COUNTY NETWORK
40% of Network
 76% Rural - 2 lanes
Low to ModerateTraffic
Typically No Curb & Gutter
ExtremeTemp. Fluctuations
PCI = 57 (Poor)

5. 60% of Network
93% Urban – 4 to 7 lanes
Moderate - High traffic
Major and Local roads
SOUTH COUNTY NETWORK – BASIN
PCI = 69 (Fair)

6. SUSTAINABLE 3-PRONG APPROACH

7. Preserve Our Pavements
• Take care of our good roads, first
• Extend the service life of our fair/poor roads through
pavement preservation treatments
Use Recycled Materials
• Reclaimed Asphalt Pavement (RAP)
• Asphalt Rubber Hot Mix (ARHM)
Reutilize Existing In-Place Materials
• Cold-In Place Recycling (CIR)
• Cold Central Plant Recycling (CCPR)
• Soil Stabilization
Sustainable 3-Prong Approach
1
2
3
Use Recycled Materials
• Reclaimed Asphalt Pavement (RAP)
• Asphalt Rubber Hot Mix (ARHM)
Reutilize Existing In-Place Materials
• Cold-In Place Recycling (CIR)
• Cold Central Plant Recycling (CCPR)
• Soil Stabilization

8. Typical Performance Prediction Curve

9. REHABILITATION/RECONSTRUCTION STRATEGY

10. Rehabilitation/Reconstruction
Strategy
 Utilize cement stabilized pulverized base
 70% cost savings over removing and replacing base
 90% reduction in greenhouse gas (GHG) and energy
savings
 Significant landfill reduction
 Shorten construction duration
 Utilize cold in-place and cold central plant recycled AC
techniques
 20%-30% cost savings over removing and replacing with
hot mix AC
 70% reduction in GHG and energy savings
 Utilizing 100% RAP

11. MULHOLLAND HIGHWAY
SUSTAINABLE PAVEMENT REHABILITATION PROJECT
COLD IN-PLACE RECYCLING (CIR)

12. Mulholland Hwy - Project Overview
 Location: Unincorporated County
Area in Malibu
 Structural Section: 5-8” AC on
native
 AverageWeighted PCI: 47 (Poor)
 Area: 1.2M SF
 Length: 9.2 centerline miles
 Treatment Strategy:
 1.5” ARHM overlay
 3” CIR AC (100% RAP)
 Contract Cost: $5 million

13. Mulholland Hwy – Before, During & After
Before Condition
Final ARHM SurfaceCIRACP
CIR Operation

14. Mulholland Hwy – Sustainable Benefits
 GreenhouseGas Reduction by 77%
 Energy Consumption Reduction by 75%
 Landfill Reduction by 4,800CY
 Cost Savings: $773K

15. BALLENTINE PLACE, ET AL.
SUSTAINABLE PAVEMENT RECONSTRUCTION PROJECT
COLD CENTRAL PLANT RECYCLING (CCPR) &
CEMENT STABILIZED PULVERIZED BASE (CSPB)

16. Ballentine Pl, et al. - Project Overview
 Location: Unincorporated County
Area in Covina
 Structural Section: 2-4” AC on 0-6”
CAB
 AverageWeighted PCI: 61 (Fair)
 Area: 900K SF
 Length: 5.5 centerline miles
 Treatment Strategy:
 1.5” ARHM
 3” CCPR AC (100% RAP)
 8” CSPB (100% recycled)
 Contract Cost: $4.6 million

17. Ballentine Pl. – Before, During & After
Before Condition
CSPB SurfaceCSPB Process
Spreading Cement

18. Ballentine Pl. – Before, During & After
(cont’d)
Central Plant
Recycling
Final ARHM SurfaceCCPRACP Surface
RollingCCPRACP

19. Ballentine Pl. – Sustainable Benefits
 GreenhouseGas Reduction by 47%
 Energy Consumption Reduction by 61%
 Landfill Reduction by 33,000CY
 Cost Savings: $2.7M
 Sustainable method (CCPR over CSPB): $2/sf
 Conventional method (Hot mix AC over CMB): $5/sf

20. Benefits of the Sustainable Approach
 Cost savings of up to 45% compared to traditional
methods
 Up to 80% reduction in energy use and GHG
emissions*
 Maintaining earth’s natural resources
 Reduction in landfill deposition
 Reduction in construction truck traffic
 Less construction working days
 Reduced construction impacts to the public
* Based upon a study completed by the National Center for Pavement Preservation

21. SINCE 2009
COLD IN-
PLACE
RECYCLING
COLD CENTRAL
PLANT
RECYCLING
SUBGRADE
STABILIZATION
PAVEMENT
PRESERVATION TOTAL
NUMBER OF PROJECTS COMPLETED 12 Projects 8 Projects 14 Projects 62 Projects 96 Projects
REDUCTION IN ENERGY CONSUMPTION (% or kWh) (2)
77% 77% 97% 79% 80%
REDUCTION IN GHG EMISSIONS (% or metric tons) (2)
79% 79% 97% 84% 84%
LANDFILL REDUCTION (CY) 42,000 20,000 132,000 221,000 415,000
COST SAVINGS (%) 35% 18% 78% 40% 45%
COST SAVINGS ($) $5,812,000 $1,158,000 $15,806,000 $29,639,000 $52,415,000
(2)
See notes below for the assumptions made to determine reduction in energy consumption and GHG emissions:
Conversion factors: 1 megajoule (MJ) = 0.277778 kilowatt hour (kWh), 1 metric ton (t) = 1.1 US ton (ton), 1 kilogram (kg) = 2.2 pound (lb.), 1 square meter (sq. m.) = 10.7639 square feet (sq. ft)
Untreated Granular Material (Aggregate Base) is adjusted by the gravel factor to equivalent to cement stabilized pulverized base (CSPB).
Under pavement preservation projects: 1 SLURRY SEAL = 0.5 CM/HMA, 1 CHIP SEAL = 0.6 CM/HMA, 1 CAPE SEAL = 0.28 RECON
All listed treatment's unit costs are weighted average by the project size using their average bid prices (NOT low bid prices)
(1)
Chappat, M. & Bilal, J. (2003). The Environmental Road of the Future: Life Cycle Analysis, Energy Consumption and Greenhouse Gas Emissions. Colas Group. 2003. http://www.colas.com/sites/default/files/publica
(1)
Chehovits, J. & Galehouse, L. (2010). Energy Usage and Greenhouse Gas Emissions of Pavement Preservation Processes for Asphalt Concrete Pavements. National Center for Pavement Preservation, Okemos,
Michigan, United States (2010) https://www.pavementpreservation.org/icpp/paper/65_2010.pdf
104,465,000 kwh
30,400 metric tons
ENERGY USAGE, GREENHOUSE GAS EMISSIONS, LANDFILL REDUCTION, AND COST SAVINGS FOR SUSTAINABLE PAVEMENT TREATMENTS (1)
TOTAL QUANTITY
SustainableTreatments - Benefits
30,400 metric tons of CO2E reduced 6,500 passenger vehicles removed from roads*
* Based on latest updated of the average fuel economy and the emissions factor for the
combustion of gasoline as of 2018.The emissions factor for passenger vehicles is 4.71 metric
tons/vehicle/year. (www.epa.gov)

22. … and remember to reduce, reuse, and recycle
ThankYou