Recycling and reuse of carbon fiber reinforcement

Kopf, F.; Kortmann, J.; Jehle, P.

doi:10.1201/9780429426506-266

Cited by 2 publications

(5 citation statements)

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“…68 That scenario was based on subprojects within the joined research project. 65,66 The LCA clearly showed that this downcycling scenario boasted negative net environmental impacts (see Figure 4). The alternative scenario 4 indicated that only a true recycling path with reuse of recycled carbon fibers in identical applications leads to improved environmental profiles of CCC (see Table 4).…”

Section: Discussionmentioning

confidence: 99%

“…The base scenario modeled a pyrolysis processing and downcycling reuse of the recycled carbon fibers in glass fleece production 68 . That scenario was based on subprojects within the joined research project 65,66 . The LCA clearly showed that this downcycling scenario boasted negative net environmental impacts (see Figure 4).…”

Section: Discussionmentioning

confidence: 99%

“…As base scenario for the end‐of‐life phase, we assumed that the wall system would be selectively demolished; the materials would be separated and transported to dedicated plants for further processing. Based on large‐scaled experimental data from research project V1.5 within the C 3 consortium, 65,66 it is assumed that 95% of the initial carbon fiber fabric would be reclaimed after demolition and separation. Then it would be processed in a commercial pyrolysis plant 67 and reused as recycled fibers in glass fleece production 68 .…”

Section: Methodsmentioning

confidence: 99%

“…58 Our reference functional unit was defined as 1 m 2 of that sandwich wall with identical load capacity and thermal insulation as well as similar sound insulation (see Table 1 [59][60][61][62] We used the nomenclature of EN 15804:2012 for the life cycle stages. 46 The life cycle impact assessment was based on the CML-2015 method 63 65,66 it is assumed that 95% of the initial carbon fiber fabric would be reclaimed after demolition and separation. Then it would be processed in a commercial pyrolysis plant 67 and reused as recycled fibers in glass fleece production.…”

Section: The Object Of Studymentioning

confidence: 99%

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Aiming for life cycle sustainability assessment of cement‐based composites: A trend study for wall systems of carbon concrete: Dresden Nexus Conference 2020—Session 4—Circular economy for building with secondary construction materials to minimise resource use and land use

Scope

Guenther

Schütz

et al. 2020

Civil Engineering Design

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The narrative sustainable building is core message of European politics. Strategies discussed in this regard concern above all material minimization by using new more efficient manufacturing technologies, new form finding approaches for load-bearing structures or new high-performance materials. The goal of the research project V2.10, funded by the German Federal Ministry of Education and Research, refers to the latter by assessing the sustainability potential of building components made of innovative textile reinforced concrete. We conceptualized a life cycle sustainability assessment framework and applied it to variants of sandwich wall systems made of carbon concrete composites and steel-reinforced concrete. Results indicate hotspots in technology and material choices that could be addressed by circular strategies, for example, refuse, reduce or recycling. Overall, one design variant made of carbon concrete composites is the best performing with respect to all dimensions of sustainability. K E Y W O R D S carbon concrete composites, life cycle assessment, life cycle sustainability assessment, social life cycle assessment, textile reinforced concrete 1 | INTRODUCTION A committed path to sustainable construction, by including the entire life cycle of built materials and antecedent design processes, 1,2 is essential to diminish adverse negative effects on the nine planetary boundaries, 3 above all in cities. 4,5 Overall, alone buildings are responsible for 90% of used mineral resources, 40% of consumed primary energy, and 35% carbon emissions 6 while contributing to about 9% in European Union's GDP. 7 For quite some time, the planetary boundary climate change has attracted great attention by policy-makers, for example, the European Parliament called for a "climate neutral Europe by 2050." 8 With its continued "EU Circular Economy Action Plan" 8 as of March 2020, the EU-COM further addresses the need to align resource scarcity and a much wider bunch of externalities related to raw material use with environmental strategies along nine "Rs." 9,10 These strategies encompass initiatives for, for example, remediating maintenance ("R0 Refuse"), savings in raw materials ("R2 Reduce"), reusing the product ("R3 Re-use") or establishing closed material loops ("R8 Recycle"). These approaches are consistent with the international ambitions of achieving Sustainable Development Goals #9 to #13. 11 The European Construction Products Regulation already requests, among others, to consider reuse and recyclability of the construction

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: The Object Of Studymentioning

confidence: 99%

See 2 more Smart Citations

Aiming for life cycle sustainability assessment of cement‐based composites: A trend study for wall systems of carbon concrete: Dresden Nexus Conference 2020—Session 4—Circular economy for building with secondary construction materials to minimise resource use and land use

Scope

Guenther

Schütz

et al. 2020

Civil Engineering Design

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“…Subsequently, the two variants of CRC showed a better environmental performance with lower GWP scores, supporting findings of Stoiber et al However, for the overall (cradle-to-grave) perspective, no clear advantage of CRC could be identified concerning GWP, as underdeveloped end-of-live processes of CRC have a major environmental impact. The development of recycling technologies and how it is already addressed by existing research projects [15] may make up this disadvantage in the future. Currently, these processes are still far from ideal from an environmental perspective as they correspond to downcycling and are associated with high energy consumption for the pyrolysis process.…”

Section: Introductionmentioning

confidence: 99%

Advanced Carbon Reinforced Concrete Technologies for Façade Elements of Nearly Zero-Energy Buildings

et al. 2022

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The building sector accounts for approx. 40% of total energy consumption and approx. 36% of all greenhouse gas emissions in Europe. As the EU climate targets for 2030 call for a reduction of greenhouse gas emissions by more than half compared to the emissions of 1990 and also aim for climate neutrality by 2050, there is an urgent need to achieve a significant decrease in the energy use in buildings towards Nearly Zero-Energy Buildings (nZEBs). As the energy footprint of buildings includes the energy and greenhouse gas consumption both in the construction phase and during service life, nZEB solutions have to provide energy-efficient and less carbon-intensive building materials, specific thermal insulation solutions, and a corresponding design of the nZEB. Carbon reinforced concrete (CRC) materials have proven to be excellent candidate materials for concrete-based nZEBs since they are characterized by a significantly lower CO2 consumption during component production and much a longer lifecycle. The corresponding CRC technology has been successively implemented in the last two decades and first pure CRC-based buildings are currently being built. This article presents a novel material system that combines CRC technology and suitable multifunctional insulation materials as a sandwich system in order to meet future nZEB requirements. Because of its importance for the life cycle stage of production, cost-efficient carbon fibers (CF) from renewable resources like lignin are used as reinforcing material, and reinforcement systems based on such CF are developed. Cutting edge approaches to produce ultra-thin lightweight CF reinforced concrete panels are discussed with regard to their nZEB relevance. For the life cycle stage of the utilization phase, the thermal insulation properties of core materials are optimized. In this context, novel sandwich composites with thin CRC layers and a cellular lightweight concrete core are proposed as a promising solution for façade elements as the sandwich core can additionally be combined with an aerogel-based insulation. The concepts to realize such sandwich façade elements will be described here along with a fully automated manufacturing process to produce such structures. The findings of this study provide clear evidence on the promising capabilities of the CRC technology for nZEBs on the one hand and on the necessity for further research on optimizing the energy footprint of CRC-based structural elements on the other hand.

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Recycling and reuse of carbon fiber reinforcement

Cited by 2 publications

References 0 publications

Aiming for life cycle sustainability assessment of cement‐based composites: A trend study for wall systems of carbon concrete: Dresden Nexus Conference 2020—Session 4—Circular economy for building with secondary construction materials to minimise resource use and land use

Aiming for life cycle sustainability assessment of cement‐based composites: A trend study for wall systems of carbon concrete: Dresden Nexus Conference 2020—Session 4—Circular economy for building with secondary construction materials to minimise resource use and land use

Advanced Carbon Reinforced Concrete Technologies for Façade Elements of Nearly Zero-Energy Buildings

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