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Circular and climate‐effective – the new student house in Braunschweig The new student house at the Technical University of Braunschweig is a multifunctional space that offers space for 200 workstations on over 1000 m2. Without solid walls the two‐story building allows for flexible use. The innovative structural concept is characterized by high resource and emission efficiency as well as recyclability, which is reflected in the reversibility of the primary structure. All components are easily detachable and can be reused in the same or a different combination after the life of the building. The modularly developed structural system can also be easily expanded, reduced or supplemented. [ABSTRACT FROM AUTHOR]

A new world record for crude steel production was recorded in 2021, which increased by 3.8% over 2020. This also affected the amount of slag produced with this production. Total waste from industrial and construction production throughout the European Union accounts for as much as 48%. Therefore, waste management should provide for the recovery of as many resources as possible. European Union strategies in line with the circular economy objectives focus on ensuring policy coherence in the areas of climate, energy efficiency, construction and demolition waste management and resource efficiency. Slags are a material of interest to researchers in terms of their use in construction. Slags, on the one hand, are materials that are becoming better understood on the other hand, we are making sure of the heterogeneity of these materials. The characteristics of physical properties of slags are influenced by many factors, including the furnace split in which they are produced. This prompts the search for tools to help determine the parameters of slags based on already available data. The study aimed to verify the hypothesis that it is possible to determine the parameter of the filtration coefficient, relevant to applications in earth structures using the machine learning algorithm – Random Forest. In the study, two types of material were analysed: blast furnace slag and furnace slag. The results of the analysis yielded a high coefficient of determination (R2) – 0.84–0.92. This leads us to believe that the algorithm may prove useful in determining filtration parameters in slags.

Reuse in new buildings of structural concrete components from demolitions holds the potential for avoiding the use of raw materials to produce new components, including cement for new castings. Reuse rates are high in the circular economy; however, reusing structural components requires documentation of the properties to equate the safety of using reused and new components. Yet, there is no structured or recognized way to perform the documentation. This paper discusses a framework for the documentation requirements for structural concrete, stating the need for documenting the mechanical properties, concrete heterogeneity, and corrosion status of the reinforcement. The possibility is explored for documenting the required properties while the components are in the donor building by use of non-destructive test (NDT) methods. Such use of NDT methods is new. A comprehensive literature survey on the indirect literature, where NDT methods are used to demonstrate similar concrete properties though related to other purposes, is conducted. The overall conclusion is that the use of NDT methods has the potential to document the requested properties before reuse. The next steps towards implementation of NDT for documenting the properties of structural concrete components for reuse involve research in combined NDT methods and the development of AI systems for data interpretation. [ABSTRACT FROM AUTHOR]

The circular economy is one of the main strategies for mitigating the environmental impacts of civil construction due to the generation of construction and demolition waste (CDW). In this transition, evaluating alternatives for using buildings as material banks is a way to make the process of reusing construction components more efficient. Thus, the article aimed to evaluate the state of the art of publications on the relationship between the circular economy in civil construction and the conceptual model of buildings as material banks to mitigate the environmental impacts of CDW. The authors chose the methodological design of Systematic Literature Review, using the Scopus and Web of Science databases for research, with the following search strings: ("construction" or "civil construction" or "built environment" or "construction industry") and ("circular economy" or "circular construction") and ("material banks" or "BAMB" or "buildings as material banks" or "building stocks" or "building materials") and ("construction waste" or "demolition waste" or "CDW" or "construction and demolition waste" or "environmental impacts"). After a screening in which only articles published in journals were selected, from 2013 to 2023, inclusion and exclusion criteria were applied, to evaluate only those that had a direct relationship with CDW management through circular economy strategies and buildings such as banks of material. As a result, 93 articles remained, which were analyzed using a quantitative and qualitative approach. The predominance of applied studies was also noted through case studies that evaluate the management of materials and waste in the urban environment. The qualitative analysis, carried out using a SWOT matrix, highlighted the strengths of the buildings, such as material banks, the potential reduction of resource extraction and urban mining, and promoting the circulation of construction products. However, the recycling of waste, such as aggregates, still stands out as the main end-of-life strategy adopted, even without occupying the top of the waste hierarchy. [ABSTRACT FROM AUTHOR]

The urgent global challenges of climate change and resource overconsumption highlight the need for sustainable innovations in the construction industry. Ordinary Portland cement, a vital construction material, significantly contributes to carbon emissions. Alkali-activated materials have emerged as promising alternatives. Three-dimensional printing (3DP) has gained attention in construction, because it offers efficiency and sustainability benefits. This study addresses the integration of alkali-activated materials and 3DP, focusing on circular economy implications. This study examines 1200 research articles from the Scopus database and comprehensively reviews 47 articles on 3DP of geopolymer structures. This study identifies critical research gaps, including a lack of focus on 3DP for alkali-activated materials, circular economy models, optimal mixtures, anisotropy mitigation, reinforcement strategies, and scalability. These insights highlight the transformative potential of 3DP with alkali-activated materials in sustainable construction, fostering a circular economy.

In recent times, the continuous growth of construction and demolition (C&D) activities have resulted in increases in the utilization of natural resources as well as global C&D waste production. A major part of C&D waste produced is dumped in landfills worldwide although some countries have adopted good recycling and reuse facilities to generated C&D waste. Based on an extensive critical review of published literature on the topic including global C&D waste recycling statistics and composition of generated wastes, this paper identifies key physical, mechanical, and geotechnical characteristics of recycled C&D waste aggregates specific to use as pavement base or subbase materials. Recycled aggregates typically have sufficient CBR, abrasion resistance, compressive strength and resilient modulus in accordance with various road standard specifications, which enable their applications for pavement base and subbase layer construction. Recycled aggregates typically have higher water absorption and lower specific gravity values than virgin aggregates. Furthermore, this study evaluates the feasibility and effectiveness of recycled aggregates in pavement base and subbase layers based on the detailed laboratory investigations. Additionally, case studies involving large-volume utilization of recycled aggregates for field-scale pavement construction are presented facilitating the broader adoption of recycled materials in sustainable construction of road pavements. These studies document crucial insights into its real field performance in terms of strength, durability and longevity. Finally, authors have discussed the potential challenges, research gaps and future insights on the use of recycled aggregates in pavement construction. The use of recycled aggregates in pavement construction still has some barriers and challenges such as availability in bulk quantity especially at the field scale and absence of road standards for application, which require further research and practical developments to promote the sustainable use of these materials in the future.

A new world record for crude steel production was recorded in 2021, which increased by 3.8% over 2020. This also affected the amount of slag produced with this production. Total waste from industrial and construction production throughout the European Union accounts for as much as 48%. Therefore, waste management should provide for the recovery of as many resources as possible. European Union strategies in line with the circular economy objectives focus on ensuring policy coherence in the areas of climate, energy efficiency, construction and demolition waste management and resource efficiency. Slags are a material of interest to researchers in terms of their use in construction. Slags, on the one hand, are materials that are becoming better understood on the other hand, we are making sure of the heterogeneity of these materials. The characteristics of physical properties of slags are influenced by many factors, including the furnace split in which they are produced. This prompts the search for tools to help determine the parameters of slags based on already available data. The study aimed to verify the hypothesis that it is possible to determine the parameter of the filtration coefficient, relevant to applications in earth structures using the machine learning algorithm – Random Forest. In the study, two types of material were analysed: blast furnace slag and furnace slag. The results of the analysis yielded a high coefficient of determination (R² ) – 0.84–0.92. This leads us to believe that the algorithm may prove useful in determining filtration parameters in slags. [ABSTRACT FROM AUTHOR]

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This study explores the perspectives and practices of architects regarding the reuse of wood in construction across five South–Central European countries: Slovenia, Serbia, North Macedonia, Bosnia and Herzegovina (BiH), and Montenegro. Based on a survey of architectural professionals, this research explores their attitudes, challenges, and motivations for using reclaimed wood, with a focus on circular construction principles. Key findings reveal unanimous agreement among respondents that both their profession and government entities inadequately support or promote wood reuse within the context of circular construction. While architects value reclaimed wood, there are country-specific variations. Environmental benefits, unique aesthetics, historical value, and sustainability are cited as primary motivators for reclaimed wood use. Additionally, respondents emphasize the ecological aspect as the most important consideration in wood product reuse, followed by economic and technological factors. Common concerns revolve around the long-term quality and maintenance of wood products. This research provides insights into the challenges and opportunities surrounding reclaimed wood use in South–Central Europe, highlighting the need for support mechanisms and increased awareness to advance circular construction practices in the region. These findings can have implications for architects and investors by identifying market opportunities, promoting eco-friendly practices, and providing valuable insights for future building designs with a focus on reclaimed wood elements within circular construction. [ABSTRACT FROM AUTHOR]

The construction industry faces the rising challenge of circularity, and digital transformation emerges as a pivotal solution. However, limited stakeholder involvement impedes the adoption of digital transformation. The existing literature does not analyze stakeholders' perceptions of digitalization adoption barriers. Therefore, this study investigates the barriers hindering digital transformation in circular construction by examining the varied perceptions of key stakeholders. The study contributes to aligning stakeholders' interests and leads to targeted and effective interventions, enhancing the likelihood of successful adoption. Using the Stakeholder Theory, the study identified contractors, investors, clients, waste managers and government as the most influential stakeholders in circular construction. This study explores skill and knowledge barriers, market barriers, regulatory barriers, organizational and cultural barriers, and financial and resource barriers as key dimensions hindering digital circular practices. The study integrates the fuzzy Delphi method, fuzzy decision-making trial and evaluation laboratory, and analytical network processing to address uncertainties and interrelationships among barriers. The findings indicate that stakeholders hold differing perceptions regarding the most critical barriers; however, there is a consensus that critical aspects are skill and knowledge, organizational and cultural, and regulatory barriers. Practical barriers include lack of government support, resistance to change, lack of feasibility information, lack of training capabilities, and poor digital literacy. The study provides theoretical and practical implications, informing future research and interventions to develop targeted strategies and initiatives.

Climate change has become a global problem, and the construction industry (CI) contributes significantly to this challenge. To circumvent these effects, the circular economy (CE) concept should be implemented in the CI. Developing economies could possess significant potential for implementing CE principles to attain sustainability, particularly in the CI. However, achieving this would require professionals in the CI to adopt some key competencies that should propel success in circular construction. Therefore, this study aims to identify the key competencies required by professionals in the CI to attain circular construction using Ghana as a case study. A quantitative research approach and purposive sampling technique were adopted. After an extensive literature review which showed several key competencies, a cross-sectional survey was conducted among five large construction firms and fifty-two responses from experienced professionals in the industry were obtained. Relative importance index and principal component factor analysis (PCFA) were adopted to evaluate the obtained data. Key significant competency skills for construction professionals to propel circular construction were identified such as specification writing for components and materials, designing for multiple-use cycles, and designing for near-zero energy buildings, among others. Three components were extracted from the PCFA which served as the guidelines for enhancing the competency skills of construction professionals namely, implementing sustainable circular practices, embracing sustainable operations management techniques, and adopting sustainable design principles. In addition, to enhance its practical implications, a competency implementation framework was also developed for construction professionals of developing economies to propel the adoption and evaluation of their competency skills toward circular construction.

This paper proposes an effective approach to realise circular construction with concrete, and shows Unreinforced Masonry as a foundational building block for it. The paper outlines the importance of circularity in building structures. It specifically focuses on the impact of circular construction with concrete on improving the sustainability of the built environment in a rapidly urbanising world economy. Subsequently, the relevance of principles of structural design and construction of unreinforced masonry to achieve circularity is articulated. Furthermore, the paper presents and summarises recent developments in the field of Unreinforced Concrete Masonry (URCM) including digital design tools to synthesise structurally efficient shapes, and low-waste digital fabrication techniques using lower-embodied-emission materials to realise the designed shapes. The paper exemplifies these using two physically realised, full-scale URCM footbridge prototypes and a commercially available, mass-customisable building floor element, called the Rippmann Floor System (RFS). The paper also outlines the benefits of mainstream, industrial-scale adoption of the design and construction technologies for URCM, including accelerating the pathway to decarbonise the concrete industry. In summary, the paper argues that URCM provides a solution to significantly mitigate the carbon emissions associated with concrete and reduce the use of virgin resources whilst retaining its benefits such as widespread and cheap availability, endurance, fire safety, low maintenance requirements and recyclability. [ABSTRACT FROM AUTHOR]

This research investigates the viability of high-strength Recycled Concrete Aggregate (RCA) sourced from demolished structures containing high-strength concrete as a substitute for natural fine aggregates (NA) in cementitious mortar applications. Concrete specimens (40 × 40 × 160 mm) were prepared in a controlled environment with varying percentages of RCA replacing NA, ranging from 0% to 100% in 10% increments. The resulting RCA aggregates exhibited lower weight for sizes from 0.01 to 1 mm compared to NA, and for 1 to 3 mm sizes, RCA weights were 145% to 177% higher than SS aggregates. After curing for 28 days, flexural and compressive strength tests were conducted on the batches. The average compressive strength for the 0% RCA batch was 66.26 MPa, while the 50% RCA batch showed the closest average compressive strength at 63.10 MPa. Batches with varying RCA levels displayed compressive strengths between 49.52 and 58.18 MPa. The highest flexural strength was observed in the 0% RCA batch, with the closest result for a batch containing RCA being the 50% RCA batch. [ABSTRACT FROM AUTHOR]

Reuse in new buildings of structural concrete components from demolitions holds the potential for avoiding the use of raw materials to produce new components, including cement for new castings. Reuse rates are high in the circular economy; however, reusing structural components requires documentation of the properties to equate the safety of using reused and new components. Yet, there is no structured or recognized way to perform the documentation. This paper discusses a framework for the documentation requirements for structural concrete, stating the need for documenting the mechanical properties, concrete heterogeneity, and corrosion status of the reinforcement. The possibility is explored for documenting the required properties while the components are in the donor building by use of non-destructive test (NDT) methods. Such use of NDT methods is new. A comprehensive literature survey on the indirect literature, where NDT methods are used to demonstrate similar concrete properties though related to other purposes, is conducted. The overall conclusion is that the use of NDT methods has the potential to document the requested properties before reuse. The next steps towards implementation of NDT for documenting the properties of structural concrete components for reuse involve research in combined NDT methods and the development of AI systems for data interpretation.

This study explores the perspectives and practices of architects regarding the reuse of wood in construction across five South–Central European countries: Slovenia, Serbia, North Macedonia, Bosnia and Herzegovina (BiH), and Montenegro. Based on a survey of architectural professionals, this research explores their attitudes, challenges, and motivations for using reclaimed wood, with a focus on circular construction principles. Key findings reveal unanimous agreement among respondents that both their profession and government entities inadequately support or promote wood reuse within the context of circular construction. While architects value reclaimed wood, there are country-specific variations. Environmental benefits, unique aesthetics, historical value, and sustainability are cited as primary motivators for reclaimed wood use. Additionally, respondents emphasize the ecological aspect as the most important consideration in wood product reuse, followed by economic and technological factors. Common concerns revolve around the long-term quality and maintenance of wood products. This research provides insights into the challenges and opportunities surrounding reclaimed wood use in South–Central Europe, highlighting the need for support mechanisms and increased awareness to advance circular construction practices in the region. These findings can have implications for architects and investors by identifying market opportunities, promoting eco-friendly practices, and providing valuable insights for future building designs with a focus on reclaimed wood elements within circular construction.

This research investigates the viability of high-strength Recycled Concrete Aggregate (RCA) sourced from demolished structures containing high-strength concrete as a substitute for natural fine aggregates (NA) in cementitious mortar applications. Concrete specimens (40 × 40 × 160 mm) were prepared in a controlled environment with varying percentages of RCA replacing NA, ranging from 0% to 100% in 10% increments. The resulting RCA aggregates exhibited lower weight for sizes from 0.01 to 1 mm compared to NA, and for 1 to 3 mm sizes, RCA weights were 145% to 177% higher than SS aggregates. After curing for 28 days, flexural and compressive strength tests were conducted on the batches. The average compressive strength for the 0% RCA batch was 66.26 MPa, while the 50% RCA batch showed the closest average compressive strength at 63.10 MPa. Batches with varying RCA levels displayed compressive strengths between 49.52 and 58.18 MPa. The highest flexural strength was observed in the 0% RCA batch, with the closest result for a batch containing RCA being the 50% RCA batch.

Timber-Cardboard Sandwich (TCS) panels are an emerging class of lightweight and low cost structural composite material, made from bio-based and recycled waste materials. However, there is a lack of data and knowledge as to their compressive behaviours, preventing their structural application as column or wall panel elements. This paper conducts experimental and analytical investigations to address this knowledge gap by characterising the eccentric axial performance of TCS columns. Thirty columns were tested under uniaxial compressive loading, with specimen types developed to investigate the influence of four key design parameters: cardboard core source material, the type and thickness of timber facings, and column slenderness ratio. Test results indicate that the face crushing governing failure mechanism and column ultimate capacity were primarily controlled by the timber facing material, with no observable influence of failure contributions from the cardboard core. Based on experimental observations, analytical models were developed to predict load-carrying capacity and lateral deflection for eccentrically-loaded TCS columns, giving ultimate load predictions within 5% for all studied column types. Research findings provide valuable insights that will enable cardboard to be more widely used in sustainable composite building products. [Display omitted] • Structural performance of timber-cardboard sandwich composite columns is investigated. • Columns achieve high load-bearing capacity with performance governed by timber facings. • Analytical models accurately predict eccentric load capacity and lateral deflection. • Cardboard core material type has minimal influence on structural performance but impacts production cost. [ABSTRACT FROM AUTHOR]

The construction industry faces the rising challenge of circularity, and digital transformation emerges as a pivotal solution. However, limited stakeholder involvement impedes the adoption of digital transformation. The existing literature does not analyze stakeholders' perceptions of digitalization adoption barriers. Therefore, this study investigates the barriers hindering digital transformation in circular construction by examining the varied perceptions of key stakeholders. The study contributes to aligning stakeholders' interests and leads to targeted and effective interventions, enhancing the likelihood of successful adoption. Using the Stakeholder Theory, the study identified contractors, investors, clients, waste managers and government as the most influential stakeholders in circular construction. This study explores skill and knowledge barriers, market barriers, regulatory barriers, organizational and cultural barriers, and financial and resource barriers as key dimensions hindering digital circular practices. The study integrates the fuzzy Delphi method, fuzzy decision-making trial and evaluation laboratory, and analytical network processing to address uncertainties and interrelationships among barriers. The findings indicate that stakeholders hold differing perceptions regarding the most critical barriers; however, there is a consensus that critical aspects are skill and knowledge, organizational and cultural, and regulatory barriers. Practical barriers include lack of government support, resistance to change, lack of feasibility information, lack of training capabilities, and poor digital literacy. The study provides theoretical and practical implications, informing future research and interventions to develop targeted strategies and initiatives. [ABSTRACT FROM AUTHOR]

Exorbitant greenhouse gas emissions associated with commercial sodium silicates (SS) have curtailed the large-scale practical implementation of geopolymers and have also led to discrepancies related to their sustainability. As a result, the extraction of SS from silica-rich biomass/agricultural waste ashes (AGWA) have gained the attention of researchers. This process involves heat treatment of AGWA with sodium hydroxide in addition to the calcination to produce the ash itself, thus requiring a systematic study to justify its sustainability. Therefore, this study presents an integrated techno-economic analysis (TEA) and life cycle assessment (LCA) to determine the economic and environmental feasibility of AGWA-derived activators for geopolymer concrete synthesis. The LCA results showed a 60–62% reduction in the greenhouse gas emissions of commercial SS-based geopolymer. A significant improvement was also observed in photochemical ozone formation, wherein the emissions were lesser from binders using AGWA based SS as compared to binders produced with commercially available SS. The TEA indicated that although the AGWA-derived SS reduced the cost of the activator by 50–70%, the overall cost of geopolymer concrete with these activators was still higher than OPC based concrete. The hydrothermal process was found to have a lower CO 2 emissions and production cost as compared to the thermochemical method to prepare AGWA-derived SS. All in all, the innovative valorization of biomass-waste-derived sodium silicate in geopolymer concrete has a lot of potential to foster a circular bioeconomy by closing the loop of agricultural waste and also promote circular construction by repurposing of waste materials in concrete. [Display omitted] • Biomass waste derived sodium silicate can be used as an activator for geopolymer. • 60–62% lesser GHG emissions than commercial SS based geopolymer. • Cost of commercial activator reduced by 40–70%. • Hydrothermal method had lesser production cost than thermochemical method. • Biomass waste derived activators foster circular economy. [ABSTRACT FROM AUTHOR]

Monitoring the transition to a circular economy requires not only the measurement of circularity but also of environmental impacts, which often present trade-offs due to different perspectives when assessing a product. This article proposes a novel approach, named ECI-MCDA, to combine circularity and Life-Cycle Assessment (LCA) indicators via Multi-Criteria Decision Analysis (MCDA) non-compensatory methods (Electre I and Electre TRI). The proposed approach includes a clustering analysis to inform the choice of circularity indicators, and a robustness analysis to assess the influence of the MCDA parameters. The ECI-MCDA approach is applied to a multifunctional building sandwich-block (CleanTechBlock) composed of a thermal insulation layer incorporating over 90% recycled glass. The environmental performance and circularity of CleanTechBlock is assessed for different end-of-life (EoL) scenarios, including reuse, closed- and open-loop recycling. The ECI-MCDA approach has demonstrated its efficacy in handling divergent results between circularity and environmental performance, identifying an alternative that addresses both perspectives. Additionally, the proposed approach shows the potential to support decision-making to improve circularity and environmental performance, thereby promoting the eco-design of products. • An application-driven approach to evaluate circular economy strategies. • Selection of circularity indicators at product-level using clustering methods. • Non-compensatory MCDA methods to select the most preferred alternative. • Criteria weighing by experts complemented with stochastic robustness analysis. • Trade-offs identified between LCA and circular economy perspectives. [ABSTRACT FROM AUTHOR]

The building and construction industry is characterized by high consumption of raw materials, waste generation, and significant energy-related greenhouse gas emissions. A substantial change in the way this sector operates is necessary to reduce its strong negative impact on the environment. In this context, the implementation of circular strategies is critical to achieving sustainable development. Reusing construction products derived from obsolete buildings at their end of life is increasingly being investigated as a strategy to achieve circularity. Despite growing interest, both in the literature and in the industry, several challenges hinder the large-scale adoption of circular reuse. The purpose of this study is to contribute to the efficient implementation of reuse in practice. The focus is on data and information that can support the reusability assessment of construction products. The findings are obtained through a case study comprising a building project in Bergen, Norway. First, the study assesses which material properties and information are available in the project, leading to the definition of eight information-driven evaluation criteria and a three-step process for reuse. The three-step process encompasses the following: (1) collecting information, (2) information-driven evaluations, and (3) planning for reuse. Each criterion is then shown in a reusability matrix, emphasizing an information-driven approach to reuse that has the potential to be extended beyond the context of the case study. Considerations for improving data management in a circular reuse process are discussed. This study provides an innovative method that may lead to a circular economy and sustainable development in the future. • The reuse of reclaimed building elements from an obsolete building at its end of life was deemed critical for circular construction. • A three-step process for the reuse of building elements in a case study project was defined. • The information-driven evaluations to define which products could be reused in the case study were presented with their respective criteria. [ABSTRACT FROM AUTHOR]

Building component reuse (BCR) is a critical means to reach sustainability goals in the construction industry through decreasing resource consumption, waste generation, and associated emissions. However, little is known about how BCR in circular construction can create economic value and opportunities for value creation and capture. Therefore, a qualitative multiple case study was conducted of two construction projects in Finland in which precast concrete building components were reused. Extensive datasets, combining interview data, observation, and written materials, were gathered to investigate and compare the projects, examine how economic value can be created from reuse for construction value chain actors, and identify the factors that determine value capture potential. The findings show that BCR may create economic value by decreasing costs and material consumption, but also by increasing material performance and creating new circular business models and revenue sources (such as concrete refurbishment and reuse-oriented design). Twenty-one value capture determinants for BCR were identified and classified into five value clusters on the micro, meso, and macro levels. The study expands circular construction research by associating circular value potential with the feasibility aspects of reuse in construction, giving businesses invaluable insights on how to gain economic benefits from concrete BCR. • Two building projects reusing concrete components are studied. • Economic value can be captured from component reuse throughout the process. • Twenty-one value capture determinants for concrete component reuse are identified. • Reuse can generate functional value, cost minimisation, and new revenue sources. [ABSTRACT FROM AUTHOR]

Lack of knowledge and tools hampers circular transition in the construction industry. This study analyzes the potential of a framework of circular indicators put forward by the Building Research Establishment Environmental Assessment Method (BREEAM-C) as an answer to the prevailing need of a metric for building circularity assessment to promote circular construction. A qualitative analysis approach is adopted, involving literature review, comparative case study and semi-structured interviews conducted for collecting expert opinions. An in-depth scrutiny of the BREEAM-C indicators revealed that they are rooted in circular principles, cover building circularity realizable through circular strategies, and have given due consideration to circularity in different impact areas, structural layers and life-cycle stages of buildings. Moreover, BREEAM-C indicators not only show capacity in identifying CE-related practices implemented, but also serve as benchmarks testifying that CE principles/strategies are incorporated in the design, construction, operation and management of the buildings. Despite having room for expansion, BREEAM-C has proven to be applicable and practical with potential for use in Taiwan as confirmed by expert opinions. Nevertheless, adaptation/localization is required to cater for different concerns with respect to climate and safety as well as local context and legislations. [Display omitted] • New circular indicators examined using qualitative analysis approach. • These indicators cover circular economy strategies and building life cycle stages. • These indicators constitute a candidate building circularity assessment metric. • Their validity and applicability proved through comparative case studies. • Their potential to support building circularity assessment confirmed by experts. [ABSTRACT FROM AUTHOR]

The increasing demand for and consumption of wood requires special attention in order to keep the wood industry sustainable. Therefore, timber reuse is presented as a solution to control the demand side. Unfortunately, the perception of timber decay poses a major barrier for reuse practices. Therefore, this article presents a factorised service life prediction model for wooden components that aims to promote their reuse. The model is based on the Australian service life prediction model, Timberlife, and the European CLICK design model's dose-response model. It predicts the potential for reuse of timber components based on their expected and remaining service life. To determine the service life, the model includes factors that differentiate between wood species, soil characteristics, regional climate and how the investigated components are connected to other components. The presented model focuses on in-ground and above-ground fungal decay and is limited to northwestern Europe. Opportunities for further research include, e.g., a further investigation of the soil characteristics' influence on decay, and evaluating the lag time for regions outside northwestern Europe. The presented service life prediction model can increase awareness and support a circular construction industry. • a service life prediction model for wooden components to promote their reuse. • Mapping in-ground and above-ground fungal decay to assess the wood's reuse potential. • Increasing awareness on timber reusability supports a circular construction industry. [ABSTRACT FROM AUTHOR]