T10 sustainable pavements-la chance

Sustainable PavementsGreen Thinking for Black Roads

Presented to:Matthew J. LaChance

Date, 2013

• Capable of being sustained

• or, relating to, or being a method of harvesting or using a resource so that the resource is not depleted or permanently damaged

• leaving the world in better condition than you found it

What is Sustainability?

Components of Sustainability

Dwindling natural resources

Reducing and reusing waste material

Reducing emissions and “greenhouse gases”

Reducing fossil fuel consumption(Current supply = 1,258b barrels/31b barrels per year = 40 years remaining*)

* HMAT 4/2011 – Stephen Muench, University of Washington

Ecological Considerations

User delay

Ride Quality

Noise

Public relations

Social Considerations

Longer lasting pavements cost less

Lower resource usage = lower costs

Lower fuel usage = lower costs

Smooth pavements reduce operating costs

Economic Considerations

Recycling

Warm Mix Asphalt

Porous Pavement

Longer Lasting Pavements

Pavement Preservation

Smooth Pavements

Sustainable Paving Practices

Recycling – 1970’s

Warm Mix Asphalt – 2000 (Europe)

Porous Pavement – 1980’s

Longer Lasting Pavements

Pavement Preservation

Smooth Pavements

Not New!

Are Sustainable Practices New?

Recycled HMA (RAP)(hot & cold in place & central plant)

Asphalt Shingles

Crumb rubber

Full depth reclamation

Recycling

Uses same materials as HMA with an additive to lower workable temperatures

Increased RAP content is possible with lower mix temperatures

Warm Mix Asphalt

Three Methods:• Wax Additive

• Chemical Additive

• Steam (requires plant modification)

Warm Mix Asphalt

Warm Mix Asphalt

Hot Mix (300 F) WMA (250 F)

Improved working conditions

Lower fumes and emissions

Lower fuel consumption

Lower plant wear

Decreased binder aging

Increased plant production

Potential Benefits:

Warm Mix Asphalt

Extended Paving Season or Paving Day

Cool weather paving

Compaction aid for stiff mixes

Longer storage

Longer haul distances

Allows drainage of water directly through pavement structure

Reduces the need for detention ponds

Requires specially designed pavement and substructure

Improves water quality

Reduces stormwater runoff rates

Porous Pavement

Properly Designed

Enforceable specifications

Construction oversight for specification compliance

Longer Lasting Pavements

Paving Mixture Design

Pavement Structure Design

Perpetual Pavement

Proper Design

Key Factors:• Material sampling at intervals appropriate for project size

• In-place mat density

• Joint density requirements

• Quality factors at the production facility

• Incentive/disincentive

• Smoothness requirements

Better Specifications

Sampling and testing at production facility during production/placement

Job site construction oversight • In-place density testing (QC)

• Core sampling for payment factors (QA)

• Smoothness testing of final surface via rolling straight edge or profilometer

Construction Oversight

Timely routine and preventive maintenance reduces the frequency of resurfacing

Energy consumption, aggregate consumption, and green house gas emissions are all reduced by the use of preventive maintenance treatments

Pavement Preservation

ISSA 45th Annual Convention - February 2007

Pavement Preservation

ISSA 45th Annual Convention - February 2007

Pavement Preservation

FHWA study* indicates a 4.5% fuel savings for a 10% improvement in IRI (50% improvement in IRI common for resurfacing projects = 22.5% fuel savings)

Typical municipal street – one mile long, ADT=2,000,assume MPG=15 on poor condition road. Resurfacing will save 10,950 gallons/year!

** TRIP – September 22, 2010

* WesTrack Facility, Nevada

Smooth Pavements

“Twenty-four percent of the nation’s major metropolitan roads – interstates, freeways and other critical local routes – have pavements in poor condition, resulting in rough rides and costing the average urban motorist $413 annually in additional vehicle operating costs due to accelerated vehicle deterioration, additional maintenance needs and increased fuel consumption”

** TRIP – September 22, 2010

* TRIP 2008

* WesTrack Facility, Nevada

Smooth Pavements

53 percent improvement in road smoothness resulted in a 2.46 % improvement in miles per gallon for large trucks.

With approximately 9,000 large trucks per day on I-70, over the course of a year the annual fuel savings would be 3,120,750 gallon of diesel. At the Nov. 16, 2006 average price per gallon of $2.56, the annual cost savings would be $7,989,120.

** TRIP – September 22, 2010

* WesTrack Facility, Nevada

MoDOT Pavement Smoothness and Fuel Efficiency 2006

Smooth Pavements

Current research indicates that the pavement smoothness has not significantly changed, and based on increased diesel fuel prices averaging $4.70 per gallon, savings to large trucks increased from $7,989,120 per year in the original study to $14,667,525 per year with increased fuel costs.

MoDOT Pavement Smoothness and Fuel Efficiency 2008 (and today)

Smooth Pavements

** TRIP – September 22, 2010

* WesTrack Facility, Nevada

Conclusion

Well built, economical pavements are not mutually exclusive from ecologically and socially sustainable pavements!

Presented byMatthew J. LaChance

Vanasse Hangen Brustlin, Inc.

Email: [email protected]

Questions & Answers