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The  (NCC, Bristol, U.K.) has completed an assessment of the composites data referenced in software tools for life cycle assessments (LCA) used within the construction sector.

As the market looks to capitalize on the decarbonization benefits that composite materials might bring to projects, there is an increasing need to account appropriately for composite materials in the assessment tools for carbon accounting. Software and other related tools for LCA range from specific software with comprehensive life cycle inventory databases, to solutions specific to the construction sector or other applications that use composite materials.

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In the study undertaken by the NCC, it was found that the carbon footprint of a glass fiber composite output from one LCA software tool could be almost double for the same assessment used in another. The result is that when applied in a decision-making process in early design stages, these diverse values can force a different outcome depending on the software solution that is used.

For example, when comparing a glass fiber-reinforced plastic (GFRP) composite component to galvanized steel with a requirement to select the design with the lowest carbon footprint, the value from LCA tool 1 would indicate a lower carbon footprint and the value from LCA tool 2 would indicate a higher carbon footprint. The NCC undertake data quality assessment to determine applicability of data values, and in this case found that the value from LCA tool 1 to be more valid.

“It is crucial for users of LCA software to understand the background data referenced by these tools, in order for them to have confidence in their decisions driven by the output of assessments, and to mitigate business risk,” Ffion Martin, engineering capability lead for sustainability at the NCC says.

Malcolm Forsyth, sustainability manager, Composites UK and Lee Canning, chair of the Construction Sector Sustainability Subteam, Composites UK note that the use of carbon emission data is now well-established as a key criteria for material selection in the construction and other major sectors. Therefore, it is vital that widely used carbon databases have up-to-date and accurate data for all materials to ensure valid and appropriate decision-making.

The NCC, together with the researchers at the University of Bath (U.K.) through the Innovation Centre for Applied Sustainable Technologies (ICAST) are establishing and applying methods for data quality assessment and presentation of uncertainty, as part of the ICAST Core Research Programme that focuses on using sustainable materials engineering to inform design and product development for decarbonization. The ICAST project will continue the LCA assessment work undertaken by NCC, and further develop LCA data for construction and infrastructure (C&I), with a focus on biomaterials and other sustainable advanced material options (e.g., glass, basalt fibers). Phase 1 of the project will complete in March 2023, which will review and implement approaches to enable users of environmental impact data to have confidence in the numbers driving carbon footprint assessment and ultimately driving design choices.