CIROAD metric reveals urban road projects achieve only 21-28% circularity
Category: Sustainability · Effect: Strong effect · Year: 2023
A new evaluation model, CIROAD, demonstrates that current urban road infrastructure projects are significantly underperforming in circular economy principles, highlighting a substantial opportunity for improvement.
Design Takeaway
Incorporate circular economy principles and evaluation metrics like CIROAD into the design and planning phases of urban road infrastructure to significantly improve sustainability performance.
Why It Matters
This research provides a concrete metric for assessing the circularity of urban road projects, enabling designers and engineers to identify specific areas for enhancement. By quantifying the current low adoption rates, it underscores the urgent need for integrating circular economy principles into the design and construction phases of infrastructure.
Key Finding
Current urban road projects are far from achieving full circularity, with scores indicating a need for substantial changes in design, material selection, and construction processes.
Key Findings
- Urban road projects evaluated scored between 21% and 28% on the CIROAD circularity metric.
- Significant opportunities exist for improvement by incorporating more circular practices.
- Prioritization for improvement includes pavement design with environmental criteria, value preservation, waste management CBA, EPDs for materials, use of recycled materials, and BIM integration.
Research Evidence
Aim: To develop and validate a multicriteria evaluation model (CIROAD) for assessing the integration of Circular Economy 4.0 principles in urban road infrastructure projects.
Method: Analytic Hierarchy Process (AHP) based multicriteria evaluation model development and application.
Procedure: The CIROAD model was constructed with seven general criteria and twenty-five sub-criteria. This model was then applied to evaluate three urban road infrastructure projects within the Chilean Ministry of Housing and Urbanism.
Sample Size: 3 projects
Context: Urban road infrastructure projects in Chile.
Design Principle
Evaluate and integrate circular economy principles throughout the entire lifecycle of infrastructure projects, from design to deconstruction, to maximize resource efficiency and minimize environmental impact.
How to Apply
Utilize the CIROAD framework or similar multicriteria evaluation tools to assess the circularity of new infrastructure designs and identify key areas for improvement before project commencement.
Limitations
The study focused on a specific region and organization, and the CIROAD model's application might yield different results in other contexts or with different project types.
Student Guide (IB Design Technology)
Simple Explanation: A new way to measure how 'green' or 'circular' road projects are shows that most current projects are not very circular, meaning there's lots of room to make them better for the environment.
Why This Matters: Understanding circularity is crucial for designing sustainable infrastructure that minimizes waste and resource depletion, aligning with global environmental goals.
Critical Thinking: How can the CIROAD model be adapted for smaller-scale design projects or different types of infrastructure to make circularity assessment more accessible?
IA-Ready Paragraph: The CIROAD evaluation model highlights a critical gap in current urban road infrastructure projects, with assessed projects achieving only 21-28% circularity. This underscores the necessity for designers to proactively integrate circular economy principles, focusing on areas such as environmentally conscious pavement design, value preservation, and the use of recycled materials, to drive a more sustainable built environment.
Project Tips
- When designing, think about how materials can be reused or recycled at the end of the project's life.
- Consider using evaluation tools to measure the sustainability of your design choices.
How to Use in IA
- Use the CIROAD model's criteria to inform your design brief and set sustainability targets for your design project.
- Apply the principles of circularity to justify your material choices and design strategies.
Examiner Tips
- Demonstrate an understanding of circular economy principles and how they can be applied to infrastructure design.
- Show evidence of evaluating design choices against sustainability metrics.
Independent Variable: Implementation of circular economy principles (e.g., material selection, design strategies, waste management).
Dependent Variable: Circularity score (CIROAD metric).
Controlled Variables: Project type (urban road infrastructure), organizational context (MINVU/SERVIU).
Strengths
- Provides a novel, specific metric for urban road infrastructure circularity.
- Integrates principles from both Circular Economy and Industry 4.0.
Critical Questions
- What are the primary barriers to achieving higher CIROAD scores in practice?
- How can the social and economic criteria within CIROAD be more effectively weighted against environmental criteria?
Extended Essay Application
- Investigate the feasibility of implementing specific circular economy strategies (e.g., using recycled asphalt) in a local infrastructure project and estimate its potential impact on a CIROAD-like score.
Source
Circular Economy 4.0 Evaluation Model for Urban Road Infrastructure Projects, CIROAD · Sustainability · 2023 · 10.3390/su15043205