green roads: the sustainable road...
TRANSCRIPT
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GREEN ROADS: THE SUSTAINABLE ROAD AHEAD
Professor Susan Tighe, PhD, PEng Canada Research Chair
Norman W. McLeod Professor Sustainable Pavement Engineering Director Centre for Pavement and Transportation Technology
University of Waterloo
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Outline of Presentation
●Background
●Context of Work
●Sustainable Practices
●Lessons Learned
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Context of CPATT Research
●Linking laboratory to field testing ●Evaluate the use of innovative materials,
designs and management practices ● Improved life cycle costs, sustainability ●Assimilation of new technologies ●Provide leadership to Canadian transportation
community (environment/loading) ●Public-Private-Academic Partnerships
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Context for Work •Investment balances: PRESERVATION & EXPANSION •Make decisions: TECHNICAL, ECONOMIC & ENVIRONMENTAL EFFECTIVENESS •Consider: SHORT & LONG TERM GOALS •Allocate Budgets: CUSTOMER REQUIREMENTS, PERFORMANCE EXPECTATIONS
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Context for Work
•Infrastructure deteriorates overtime •Insufficient resources and funding •Opportunity to be “Green” and Sustainable •Combine sustainability with economic benefits •Need a simple way to quantify sustainability
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Integrating Laboratory Testing ●Demonstrating differences between materials ●Using innovative tools to measure noise
characteristics ●Calibrating design models using finite element,
finite differences, mechanistic empirical methods
●Technical/economic/sustainable designs ●Moving laboratory to field
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Field Testing: CPATT Test Track ●Field performance of three premium surface
course mix technologies ●Traffic/Environmental Impacts on Pavement
Design ●Training and Education of Students ●Testing of Innovative Monitoring Equipment ●Evaluation of WIM ●Assisted in developing satellite test sites
(Perpetual Pavement, GTAA, City of Hamilton)
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Laboratory Testing ● Examining material characterization properties
(recycled products, warm asphalt) ● Using innovative tools to measure noise
characteristics ● Full sized freezer to test materials (-40C) ● Working with data loggers to improve in-situ
measurements (seasonal load restrictions) ● Relate lab mixes to construction – consider
workability
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Laboratory – Field Integration
Cored sample for dynamic modulus testing Dynamic modulus sensor configuration of three
linear variable differential transducers (LVDT’s)
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Laboratory – Field Integration
Dense Graded Asphalt Cored Sample
Porous Asphalt Cored Sample
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Pavement Sustainability Factors
Sustainable Transportation
Pavement Design and
Management
Material Use and Recycling
Traffic Planning
Public Transit Alignments
Land Use and Development
Walkways, Bikeways, &
Parkways
Sustainable pavement is a subset of sustainable transportation
Main focus on Pavement Design and Management; and Material Use and Recycling
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Pavement Sustainability Factors
•Usage of Raw Materials •Alternative Materials •Usage of Management Systems •Air Quality •Water Quality •Noise •Energy Usage
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Pavement Sustainability Factors
•Calculate these factors for various designs •Consider short and long term goals and objectives •Consider sustainability
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Sustainability Workshop
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It is not more difficult But, it is different
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Availability of Resources ●Critical shortage of quality aggregate ●Many areas using aggregate faster than it is
being made available ●More difficult to access aggregate
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19
Reclaimed Asphalt Pavement Tires
Other Materials? New Designs?
Shingles Recycled Concrete Aggregates
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Department of Civil & Environmental Engineering | University of Waterloo 200 University Ave. West | Waterloo, ON, Canada N2L 3G1
Recycling ●Consider sustainable preservation and
rehabilitation options that are: ●Safe ●Efficient ●Environmentally Friendly ●Cost effective
●Optimize recycling ●Best Use of Materials
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Department of Civil & Environmental Engineering | University of Waterloo 200 University Ave. West | Waterloo, ON, Canada N2L 3G1
In-Situ Recycling ● In-situ recycled pavements have performed well, often
carrying significantly more traffic over their service life than anticipated
● Designs built in the past have evolved from theory, road tests, and trial and error
● Many lessons have been learned from design problems/flaws, materials, and construction practices that have caused problems
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Perpetual Pavement (PP)
Very thick asphalt pavement Real-time evaluation of performance
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• HWY 401 Project • HWY 401 Project: Instrumentation Design
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• HWY 401 Project • HWY 401 Project: Instrumentation Design
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Department of Civil & Environmental Engineering | University of Waterloo 200 University Ave. West | Waterloo, ON, Canada N2L 3G1
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Sound Absorption Coefficient vs. Frequency
0
0.02
0.04
0.06
0.08
0.1
0.12
0.14
200 300 400 500 600 700 800 900 1000 1100 1200
Frequency (Hz)
Abs
orpt
ion
Coe
ffici
ent
rOFC rOGC SMA HL-3
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Warm Mix Warm Mix • Enables for Longer Truck Hauls • Extends Paving Season
• Joint Solution • Improved Workability • Lower • Emissions
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Innovative Materials and Design Warm Asphalt (WA) & Porous Asphalt (PA)
● Reduces Emissions, Longer Hauls (WA) ● Innovative Technology (WA) ● Structurally same as conventional (WA) ● Assists with Stormwater Management (PA) ● Excellent Potential for Parking Lots ad Low Volume
Roadways (PA) ● Structural and Hydrological Design (PA) ● Assist with Climate Change (WA&PA)
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Sustainability: Identification Factors •Emission control •Material conservation •Long life infrastructure •Recycling and reuse •Innovation •Research and development
• Air quality • Noise reduction • Proactive planning • Reduce user delay • Improve safety • Training and leadership
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Department of Civil & Environmental Engineering | University of Waterloo 200 University Ave. West | Waterloo, ON, Canada N2L 3G1
Goal ●Understand the material performance ●Understand the performance under varying
environments and loading conditions ●Examine how using different technologies
effect LCC of pavement ●Provide triple bottom line solution
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Serviceability
Cost
Environmental Impacts
Conventional Pavement
Recycled Pavement/ Using By-Products
Porous Pavement
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Probability of LCC of: Probability of
PvtA <
LCC of:B <
LCC of:C <
LCC of:D <
LCC of:Having the Lowest
LCC, %A X 0.0 3.2 9.8 89.9B 100.0 X 89.1 95.4 0.0C 96.8 10.9 X 58.8 2.1D 90.2 4.6 41.2 X 8.0
• Based on many simulations: Option lowest LCC • Preferred option: highest probability of lowest LCC,
but consider importance of risk to agency
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Quantify Costs/Benefits – Short and Long Term With The Inherent Goal To: ●Understand functional/structural performance
of technologies ●Understand the environmental performance
between technologies ●Examine how using different technologies effect
LCC ● Identify social/political aspect of sustainability
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Sustainable Material ●Develop a design procedure? ●Will it work in cold climates? ●Will it work in hot climates? ●Can it improve economics? ●Maintain or improve performance
characteristics? ●Will contamination impact performance?
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Life Cycle Assessment •Technical •Economic •Sustainable •Costs/Benefits
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Green Initiatives •To understand green rating systems available •Distinguish between different rating systems •Use them as guideline for developing MTO Green Pavement Rating System
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Examples of Sustainability Credits Category Point ID Description Max Credit
Pavement Technology
PT-1 Long-Life Pavement Designs 3
PT-2 Permeable Pavements 1
PT-3 Quiet Pavements 3
PT-4 Cool Pavements 2
Materials and Resources
MR-1 Recycled Content 6
MR-2 Reuse of Pavement 3
MR-3 Local Materials 3
MR-4 Construction Quality 2
Energy and Atmosphere
EA-1 Reduce Energy Consumption 3
EA-2 GHG Emission Reduction 2
EA-3 Improve Rolling Resistance 1
EA-4 Pollution Reduction 3
Innovation and Design Process
I-1 Innovation in Design 2
I-2 Exemplary Process 2
Max Credit 36
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Pavement Sustainability •Why are these technologies sustainable? •What are the benefits of using the technologies? • How well are these technologies currently utilized? •Can we better utilize the technologies? •Are there barriers to implementation? •How can we address pavement sustainability in 5,10, and 50 years?
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Pavement Sustainability •What are the costs to develop sustainable technologies? •What are the benefits of implementing pavement sustainability? •How should we achieve a balanced quantification of a sustainable pavement technology? •Are there other technologies that should be explored?
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Lessons Learned
● Development of Transportation Association of Canada Pavement Asset Design and Management Guide
● Structural/Environmental data fundamental ● Two staged process: lab testing/field testing ● Experimental Design Essential!!! ● Public-Private –Academic Partnerships Work ● Adoption of New Materials and Designs ● Think Green!!!