Evaluating Economic and Environmental Sustainability of Road Projects

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Evaluating Economic and Environmental
Sustainability of Road Projects
IMPROVING THE ROAD NETWORK Right Price, Done the
Right Way, at the Right Time 12-14 October 2008 -
NAPIER
Neil Bennett, South Island Road Asset Manager,
Fulton Hogan
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Climate change is at the heart of New Zealands
drive to sustainability

• aspire to be first nation to be truly sustainable
• carbon neutrality at heart of sustainability
• More than any other developed nation, NZ needs
  to go the extra mile to lower greenhouse gas
  emissions and increase sustainability
• Rt. Hon Helen Clark
• Prime Minister, February 2007

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Sustainable Procurement

• Department of Corrections goal is to reduce
  environmental impact by
• Selection of materials and systems that
  principally minimise their impact on the
  environment
• Employing current and proven cost effective
  technology and design techniques
• Adopting best practice procedures and addressing
  whole of life cycle cost

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• Fulton Hogan is committed to minimising the
  environmental impact of our activities and
  promoting sustainable development

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• Fulton Hogan is committed to
• Sustainable Energy Use
• Waste Reduction and Recycling
• Legal Compliance
• Sustainable development

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Case Study 1 Unbound Granular
25mm
150mm
250mm
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Case Study 2 Structural Asphalt
40mm
125mm
200mm
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Results
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Emitted CO2 from Construction
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Embedded CO2 from Construction
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Emitted CO2 from Vehicle Use

Total CO2 from Structural Asphalt 18008
tonnes Total CO2 from Unbound Granular 19547
tonnes Difference 1539 tonnes
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Impact of Roughness
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Impact of Roughness
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Shortened Construction Period
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Greenhouse Gases from Bitumen
A Carbon Footprint is an assessment of the
greenhouse gases emitted by a particular
organisation or project.
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Aggregate Shortages

• Considerable Pressure on the supply of aggregate
  for roading and building in New Zealand
• Unbound Pavement 8755 tonnes per km
• Structural Asphalt 3454 tonnes per km

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Recycling

• At the end of the pavement life the structural
  asphalt pavement will be able to be 100 recycled

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Conclusion

• Consideration of structural asphalt pavements as
  an option for high volume urban arterials proven
• Reduced environmental impact
• Roughness benefits from smooth pavements needs
  further analysis
• Willingness to pay study needed

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Questions