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.
Introduction to Microprocesso programming and interfacing.pptx
Los Angeles County's Sustainable Roadway Improvement Program
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
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
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)