Unsealed road pavements: Why we need sustainable design


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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 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
  • 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 http://www.aurecongroup.com/en/expertise/roads-and-highways.aspx http://www.aurecongroup.com/en/projects/by-location/australia.aspx http://www.aurecongroup.com/en/expertise/planning-and-advisory/integrated-planning.aspx
  • • 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 http://www.aurecongroup.com/en/thinking/by-expertise/infrastructure-design.aspx
  • 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 http://www.aurecongroup.com/en/expertise/planning-and-advisory/environmental-management.aspx http://www.aurecongroup.com/en/markets/international-development/climate-change.aspx
  • • 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 http://www.aurecongroup.com/en/thinking/thinking-papers/sustainable-roads-initiative.aspx http://www.aurecongroup.com/en/projects/by-market/construction.aspx
  • 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
  • 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
  • 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 http://www.aurecongroup.com/en/thinking/thinking-papers/sustainable-roads-initiative.aspx
  • 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
  • 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 G ra ve l l os s/ IR I Du st /S lip pe rin es s Wearing course type Dust, PM10 (kg/VKT) Slipperiness Gravel loss/yr (mm) IRI increase/yr (IRI)
  • 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 CO 2 eq (T on ne ) Wearing course type
  • 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 http://www.aurecongroup.com/en/expertise/planning-and-advisory/sustainability.aspx
  • Read more on our website! Contact Ian Van Wijk Technical Director, Aurecon +61 7 31738963 Ian.vanwijk@aurecongroup.com http://www.aurecongroup.com/en/expertise/planning-and-advisory/sustainability.aspx mailto:Ian.vanwijk@aurecongroup.com Slide Number 1 Slide Number 2 Slide Number 3 Slide Number 4 Slide Number 5 Slide Number 6 Slide Number 7 Slide Number 8 Slide Number 9 Slide Number 10 Slide Number 11 Example of the effect of material type on sustainability outcome Effect of material type on emissions Slide Number 14 Slide Number 15