On the Definition, Assessment, and Enhancement of Circular Economy across Various Industrial Sectors: A Literature Review and Recent Findings

Vogiantzi, Christina; Tserpes, Konstantinos

doi:10.3390/su152316532

Cited by 11 publications

(3 citation statements)

References 139 publications

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“…Measuring circularity is currently not standardised across society or industries due to differing definitions, scopes, methods, and data sources used for circularity indicators, so it is challenging to maintain consistency, comparability, and transparency of measurement data [46]. In order to ensure that CE is adequately understood and its performance can be accurately measured, the development of new standards is imperative.…”

Section: R9 Recovermentioning

confidence: 99%

Drivers and Barriers for the Adoption of Circular Economy Principles towards Efficient Resource Utilisation

Alivojvodic,

Kokalj

2024

Sustainability

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Contemporary societies, whether they have reached advanced levels of economic and social development or are still developing, need to prioritise the implementation of circular economy practices. This will facilitate the shift towards regenerative, sustainable, and closed-loop industrial systems. For now, there are some efforts to encourage patterns of production and consumption through changes in economic trends, development of institutional frameworks, harmonising regulations in the field of environmental protection, and raising the level of social awareness to achieve, above all, greater efficiency of resources. Extensive literature that deals with monitoring the implementation of the circular economy already indicates the existence of numerous barriers in this process but also notices some incentives for raising the degree of circularity of the observed systems. In this paper, the question of whether a single value can represent the level of circularity of the chosen material/product chain is researched. An overview of barriers and drivers for implementing circular economy strategies is given to structure a proper metric framework in correlation to the research question. The objective was to simplify the monitoring of circularity by developing a unique index for comparing material/product chains in similar systems. This was accomplished by using the circular material use (CMU) rate introduced in the European Union and modifying it for financial data calculation. As a result, the circular economy index, which covers all 9R strategies (CEIR), is obtained. The practical verification of model applicability was shown by determining the degree of circularity achieved for passenger cars in the four observed EU countries.

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Section: R9 Recovermentioning

confidence: 99%

Drivers and Barriers for the Adoption of Circular Economy Principles towards Efficient Resource Utilisation

Alivojvodic,

Kokalj

2024

Sustainability

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“…In addition, it is worth noting that FRP (fiber-reinforced polymer) can serve as a corrosion-resistant alternative to steel reinforcement bars, offering further application flexibility [ 3 , 4 , 5 ]. However, CFRPs currently suffer from resource inefficiency, involving high energy demands during manufacturing and limited recycling options, resulting in a significant portion of composites ending up in landfills [ 6 , 7 ]. The continuous rise in regulations, increasing landfill expenses, and the growing desire for lightweight structures have intensified the need to find methods to recycle composites, and particularly thermoset CFRPs [ 8 , 9 ].…”

Section: Introductionmentioning

confidence: 99%

A Preliminary Investigation on a Water- and Acetone-Based Solvolysis Recycling Process for CFRPs

Vogiantzi,

Tserpes

2024

Materials

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Composites, and especially carbon-fiber-reinforced plastics (CFRPs), are increasingly used in the automotive, aerospace, and aviation industries, and as a result, CFRP production has increased dramatically, leading to a corresponding increase in waste. Landfills and the incineration of waste are likely to be restricted as a result of legislation, thus highlighting the need for efficient recycling methods for CFRPs. However, the recycling of CFRPs is very challenging, mainly due to the difficulty of removing their thermosetting matrix. This study reports a pre-screening of the solvolysis recycling process for CFRPs based on the mechanical properties of the recovered fibers. To this end, solvolysis tests were conducted on unidirectional CFRP samples under supercritical and subcritical conditions using acetone and water. The solvolysis tests were conducted for various conditions of temperature, pressure, and reaction time, without the use of any catalyst. Also, the loading rate (volume of solvent/volume of reactor) was constant. The efficiency of the recycling processes has been evaluated through a morphological and a mechanical characterization of the recovered fibers. In most cases, the decomposition efficiency of the epoxy resin, measured in terms of mass, ranged between 90 and 100%. Moreover, the scanning electron microscopy images of the recovered fibers showed negligible traces of resin residues and no detectable signs of physical damage or any changes in morphology with regard to diameter. Finally, the single-fiber tension tests revealed that that the recovered fibers retained more than 61% of their initial Young’s modulus and 70% of their tensile strength.

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“…In addition, it is worth noting that FRP (fiberreinforced polymer) can serve as a corrosion-resistant alternative to steel reinforcement bars, offering further application flexibility [3][4][5]. However, CFRPs currently suffer from resource inefficiency, involving high energy demands during manufacturing and limited recycling options, resulting in a significant portion of composites ending up in landfills [6,7]. The continuous rise in regulations, increasing landfill expenses, and the growing desire for lightweight structures have intensified the need to find methods to recycle composites, and particularly thermoset CFRPs [8,9].…”

Section: Introductionmentioning

confidence: 99%

A Preliminary Investigation on the Water- and Acetone-Based Solvolysis Recycling Process for CFRPs

Vogiantzi,

Tserpes

2024

Preprint

View full text Add to dashboard Cite

Composites, and especially carbon fiber reinforced plastics (CFRPs), are increasingly used in the automotive, aerospace, and aviation industries, and as a result, CFRP production has increased dramatically, leading to a corresponding increase of waste. Landfill and incineration of waste are likely to be restricted as a result of the legislation, thus highlighting the need for efficient recycling methods for CFRPs. However, the recycling of CFRP is very challenging, mainly due to the difficulty of removing the thermosetting matrix. This study reports a pre-screening of the solvolysis recycling process for CFRPs based on the mechanical properties of the recovered fibers. To this end, solvolysis tests were conducted on unidirectional CFRP samples under supercritical and subcritical conditions using acetone and water. The solvolysis tests were conducted for various conditions of temperature, pressure, and reaction time. The efficiency of the recycling processes has been evaluated through a morphological and a mechanical characterization of the recovered fibers. In most cases, the decomposition efficiency of the epoxy resin, measured in terms of mass, ranged between 90 and 100%. Moreover, the scanning electron microscopy images of the recovered fibers showed negligible traces of resin residues and no detectable signs of physical damage or any changes in morphology with regard to diameter. Finally, the single-fiber tension tests revealed that that the recovered fibers retained more than 61% of their initial Young's modulus and 70% of their tensile strength.

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On the Definition, Assessment, and Enhancement of Circular Economy across Various Industrial Sectors: A Literature Review and Recent Findings

Cited by 11 publications

References 139 publications

Drivers and Barriers for the Adoption of Circular Economy Principles towards Efficient Resource Utilisation

Drivers and Barriers for the Adoption of Circular Economy Principles towards Efficient Resource Utilisation

A Preliminary Investigation on a Water- and Acetone-Based Solvolysis Recycling Process for CFRPs

A Preliminary Investigation on the Water- and Acetone-Based Solvolysis Recycling Process for CFRPs

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