engineering more sustainable pavements · 2018-03-15 · sustainable pavements should: •achieve...
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Office of Infrastructure
Engineering More Sustainable Pavements
Heather DyllaFHWA Office of Infrastructure2018 Virginia Concrete Conference
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Key Takeaways
Definition
Approaches
Resources
Tools
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Sustainable Pavements
Should:• achieve the engineering goals for which it
was constructed, • preserve and (ideally) restore surrounding
ecosystems,• use financial, human, and environmental
resources wisely, and • meet basic human needs such as health,
safety, equity, employment, comfort, and happiness.
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Parallels VDOT’s Core Values
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Advance the knowledge andpractice of:
• Designing
• Constructing
• Maintaining
More sustainable pavements through:
• Stakeholder engagement
• Education
• Development of guidance and tools
FHWA Sustainable Pavements Program
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Source: FHWA
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Triple Bottom Line
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Source: FHWA
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Pavement Life Cycle
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Source: FHWA
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Concrete Sustainable Approaches
Materials
•RCA•Blended
Cements
Design
•Pervious•Two-Lift•Long Life
Construction
•Roller Compacted Concrete
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End of Life
•On-Site Recycling
•RCA (unstabilizedbases)
Maintenance
•Bonded Concrete Overlays
•Diamond Grinding
Use
•Maintain Smoothness
•Longitudinal textures
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Sustainability Approach Potential Impacts
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Social
• Reduced fuel used during construction
• Reduced construction duration
• Lower ride quality
Environment
• Reduced material & construction environmental impacts• Cement• Admixtures• Fuel
Economic
• Significant construction cost savings• Material• Labor
Roller Compacted Concrete
Source: FHWA
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Sustainability Performance Measures for Project-Level Analysis
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Life-Cycle Assessment(LCA)
Sustainability Rating Systems
• INVEST• ENVISION
Performance Testing
Performance Testing
Source: FHWA
Note: This does not pertain to Life Cycle Planning requirements for Asset
Management.
Life-Cycle Cost Analysis(LCCA)
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LCA for Pavement Design
Evaluates potential environmental impacts
• Eutrophication• Acidification• Smog• Ozone depletion and others
Inputs for all stages• Material• Fuel
Outputs for all stages• Pollution to water• Pollution to soil• Pollution to air
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Source: FHWA
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End Goal
Current
Biggest Barrier: Data Availability
Pavement LCA Implementation Elements
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Source: FHWA
Source: Pixabay
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Environmental Product Declarations
Like nutrition label but with environmental impacts
• Eutrophication• Acidification• Smog• Ozone depletion and others
An LCA that follows industry product specific rules (Product Category Rules)
• Functional unit• System boundaries
Allows for some sort of comparison12
Source: FDA
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LCA/EPD Implementation
Policy• Caltrans• California High
Speed Rail Authority Pilots• Minnesota DOT• Arizona DOT
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Benchmarking• Texas DOT• Illinois DOT
sTools• Louisiana DOT• Illinois
Tollway
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EPD Challenges and Barriers
Barriers• Education• Top-down support• Public data sets
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Challenges• Incentives• Harmonization
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Advance the knowledge andpractice of:
• Designing
• Constructing
• Maintaining
More sustainable pavements through:
• Stakeholder engagement
• Education
• Development of guidance and tools
FHWA Sustainable Pavements Program
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Source: FHWA
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References
•Reference Manual
Technical Guidance
•LCA Framework
Technology Transfer
•Webinars•Tech Briefs
Current Program Resources
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Sustainable Pavement Technical Working Group• Public bi-Annual meeting
https://www.fhwa.dot.gov/pavement/sustainability/
Source: FHWA
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Sustainable Pavements Reference Document
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Education • Shows how to incorporate
sustainability concepts into pavement design, construction and maintenance
Technical Guidance• Incorporates life cycle thinking• Identifies more sustainable
approaches• Benchmarks current understandingDeployment• Encourages adoption of more
sustainable practiceswww.fhwa.dot.gov/pavement/sustainability/hif15002/hif15002.pdf
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LCA Framework
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Education • Informs agencies on pavement LCA
methodology and application • Shares LCA principles with
practitionersTechnical Guidance• Shares guidance on implementation of
pavement LCA within the U.S.• Documents current practices and gapsDeployment• Encourages progress in pavement
LCAwww.fhwa.dot.gov/pavement/sustainability/hif16014.pdf
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References
• Case Studies
Tools
• LCA Benchmarking Tool
Technical Guidance
• LCA Pilot Study
Future Program Resources
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Sustainable Pavement Technical Working Group• May 8-9, 2018 – Seattle, WA
https://www.fhwa.dot.gov/pavement/sustainability/
Source: FHWA
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• Sustainable Pavements is good engineering
Conclusion
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• Current practices include many sustainable approaches
• Now we need to begin measuring and communicating our progress• LCA, LCCA, and green rating
systems
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• Visit Website www.fhwa.dot.gov/pavement/sustainability• Review available resources• Join the Sustainable Pavements Program Friends List
• Attend a Sustainable Pavement TWG meeting
• Contact me with questions, comments, or suggestionsHeather Dylla,[email protected]
Want More?
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