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Why we need sustainable design
Unsealed road
pavements
Infrastructure has a pivotal role
to play in regional development.[ ]
AURECON ON
SUSTAINABLE ROADS
What is
Sustainability?
“Meeting the needs of the present population
without compromising the ability of future
generation...
80%
“Local roads
represent almost 80 per cent
of all roads in Australia, when
measured in kilometres. In rural,
regional a...
• Around 500,000 kilometres with about 400,000 kilometres under the
jurisdiction of Local Council (double that of sealed r...
Sustainability
the change in focus
“The early decades of the 21st Century will see a change in the focus of
environmental ...
• Sustainable design of unsealed roads
can positively effect social,
environmental and health factors.
• It can reduce car...
Outcomes
Social
Environmental
Economic
Categories
Management Systems
Land
Procurement & Purchasing
Waste
Climate Change Ad...
Infrastructure phases
1. Design
• Pavement thickness – save by reducing thickness
• Material properties – save by using lo...
Material properties
Sustainable design
Linking material properties to sustainability
outcomes:
• Slipperiness: road safety...
Examples
Sustainable design
Example of the effect of
material type on
sustainability outcome –
significantly different
out...
AURECON ON
SUSTAINABLE ROADS
Example of the effect of material
type on sustainability outcome
0
5
10
15
20
25
30
0.0
0.5
1...
AURECON ON
SUSTAINABLE ROADS
Effect of material type on emissions
0
0.5
1
1.5
2
2.5
3
3.5
Aust avg
PI=12
GradC avg
T2.5
Do...
Sustainable design
Unsealed roads can be designed to be
more sustainable
• Desired outcomes – Social,
environmental and ec...
Read more on
our website!
Contact
Ian Van Wijk
Technical Director, Aurecon
+61 7 31738963
Ian.vanwijk@aurecongroup.com
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Unsealed road pavements: Why we need sustainable design

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Local roads represent almost 80 per cent of all roads across Australia. In rural and regional Australia, these roads are key to successful export transit, are the connections between communities and ultimately promote community safety. Around 500,000 kilometres of these roads are unsealed. Aurecon’s pavements expert, Doctor Ian Van Wijk, explains how the sustainable design of unsealed roads can positively affect social, environmental and health factors, as well as ultimately support rural development.

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Unsealed road pavements: Why we need sustainable design

  1. 1. Why we need sustainable design Unsealed road pavements
  2. 2. Infrastructure has a pivotal role to play in regional development.[ ] AURECON ON SUSTAINABLE ROADS
  3. 3. What is Sustainability? “Meeting the needs of the present population without compromising the ability of future generations to meet their own needs.” World Commission on Environment and Development (WCED) “Infrastructure that is designed, constructed and operated to optimise social, environmental and economic outcomes of the long term.” Infrastructure Sustainability Council of Australia (ISCA) AURECON ON SUSTAINABLE ROADS
  4. 4. 80% “Local roads represent almost 80 per cent of all roads in Australia, when measured in kilometres. In rural, regional and remote Australia, these roads are often the biggest single factor for business efficiency, domestic and export market success, social connectedness and community safety. These roads are failing to support efficient agricultural business.” According to Australian Rural Roads Group, 2014 AURECON ON SUSTAINABLE ROADS
  5. 5. • Around 500,000 kilometres with about 400,000 kilometres under the jurisdiction of Local Council (double that of sealed roads) • Value of about AUD 12 billion, but AUD 2.3 billion in a poor or very poor state • Maintenance budget of AUD1 billion per year • Important to rural (agricultural) development, access (e.g. medical centres and schools) The facts AURECON ON SUSTAINABLE ROADS
  6. 6. Sustainability the change in focus “The early decades of the 21st Century will see a change in the focus of environmental reporting in roads agencies, from the current practise of environmental management’ which seeks to minimise ecological disturbance, to a second generation of reporting that expands this scope to include sustainable development associated considerations, …and the potential for alternative ‘low-carbon’ options. Such a shift in focus will form an important part of a road authority’s approach, to issues of growing concern such as increasing energy costs and increasing impacts from climate change, such as greater weather damage to road infrastructure.” A Literature Review of Sustainability Performance Assessment Road Agencies for the Sustainable Built Environment National Research Centre (2014). AURECON ON SUSTAINABLE ROADS
  7. 7. • Sustainable design of unsealed roads can positively effect social, environmental and health factors. • It can reduce carbon emissions, pollution and decrease the depletion of natural resources. • Economic benefits in regards to fuel consumption, construction and maintenance costs can also be achieved. Sustainable design AURECON ON SUSTAINABLE ROADS
  8. 8. Outcomes Social Environmental Economic Categories Management Systems Land Procurement & Purchasing Waste Climate Change Adaptation Ecology Energy & Carbon Community Health, Wellbeing & Safety Water Heritage Materials Stakeholder Participation Discharges to Air, Land & Water Urban and Landscape design Innovation Outcomes and categories AURECON ON SUSTAINABLE ROADS
  9. 9. Infrastructure phases 1. Design • Pavement thickness – save by reducing thickness • Material properties – save by using local materials 2. Construction • Methods and equipment – save by using appropriate types and processes • Haulage – save by reducing haulage 3. Operation/maintenance • Management system – save by effective modelling, planning and execution • Type of maintenance and materials – save by using the most appropriate materials Sustainable design AURECON ON SUSTAINABLE ROADS
  10. 10. Material properties Sustainable design Linking material properties to sustainability outcomes: • Slipperiness: road safety • Dust: road safety & health • Erosion: sediment • Gravel loss: use of natural resources • Roughness: road safety & vehicle operating cost AURECON ON SUSTAINABLE ROADS
  11. 11. Examples Sustainable design Example of the effect of material type on sustainability outcome – significantly different outcomes Effect of material type on emissions – quantification required to assess sustainability AURECON ON SUSTAINABLE ROADS
  12. 12. AURECON ON SUSTAINABLE ROADS Example of the effect of material type on sustainability outcome 0 5 10 15 20 25 30 0.0 0.5 1.0 1.5 2.0 2.5 3.0 Gravelloss/IRI Dust/Slipperiness Wearing course type Dust, PM10 (kg/VKT) Slipperiness Gravel loss/yr (mm) IRI increase/yr (IRI)
  13. 13. AURECON ON SUSTAINABLE ROADS Effect of material type on emissions 0 0.5 1 1.5 2 2.5 3 3.5 Aust avg PI=12 GradC avg T2.5 Doonan rd sample 1 Laterite/GEH Calcrete QLD sandstone QLD white rock WC1 WC2 CO2eq(Tonne) Wearing course type
  14. 14. Sustainable design Unsealed roads can be designed to be more sustainable • Desired outcomes – Social, environmental and economic • Optimise – Design, construction and maintenance • Models and approaches are available, but must be linked to sustainability outcomes • Can add value if quantified and used
  15. 15. Read more on our website! Contact Ian Van Wijk Technical Director, Aurecon +61 7 31738963 Ian.vanwijk@aurecongroup.com

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