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Wallhagen, Marita, tekn dr, docentORCID iD iconorcid.org/0000-0001-8413-3975
Publications (10 of 46) Show all publications
Johansson, L., Bahrami, A., Wallhagen, M. & Cehlin, M. (2024). A comprehensive review on properties of tailings-based low-carbon concrete: Mechanical, environmental, and toxicological performances. Developments in the Built Environment, 18, Article ID 100428.
Open this publication in new window or tab >>A comprehensive review on properties of tailings-based low-carbon concrete: Mechanical, environmental, and toxicological performances
2024 (English)In: Developments in the Built Environment, E-ISSN 2666-1659, Vol. 18, article id 100428Article in journal (Refereed) Published
Abstract [en]

With concrete’s key role in construction and infrastructure, the reduction of its carbon footprint is critical for addressing global carbon emissions. One strategy to reduce environmental impact from concrete production is to replace cement clinker or fine aggregates in concrete with industrial wastes. Mine tailings, being a high-volume under-utilized resource, possess properties making it suitable for use as a partial substitute for cement or fine aggregates. This review article provides an overview of the recent findings within the topic of tailings-based concrete (TBC). Many of the identified publications aimed to describe the mechanical performance of TBC, and to optimize the concrete mix with respect to the strength and durability. The recommended cement replacement ranged from 5 to 25% and the recommended fine aggregate replacement ranged from 20 to 60%. In general, the compressive strength was decreased with increasing use of tailings as a replacement of cement. For the use of tailings as replacement for fine aggregates, the correlation was more complex, normally the mechanical performance enhanced at low replacement levels, until it reached an optimum after which it decreased. CO2 savings for replacing fine aggregate with tailings were up to 12% and for the cement replacement up to 30%. When assessing the environmental performance, most of the publications did not account for the loss of its mechanical performance, which could lead to the risk of underestimating the environmental impact. This review not only provides a basis for understanding the mechanical, toxicological, and environmental performances of TBCs, but also links the perspectives together, unveiling the connections between them. Moreover, this review presents an organized overview of the topic of TBC and points out topics for future research.

Place, publisher, year, edition, pages
Elsevier, 2024
Keywords
Tailings; Concrete; Supplementary cementitious materials; Waste; Cement; Aggregate; Mechanical performance; Toxicological performance; Environmental performance
National Category
Civil Engineering
Identifiers
urn:nbn:se:hig:diva-44024 (URN)10.1016/j.dibe.2024.100428 (DOI)2-s2.0-85189935433 (Scopus ID)
Funder
University of Gävle
Available from: 2024-04-09 Created: 2024-04-09 Last updated: 2024-05-16Bibliographically approved
Petrović, B., Eriksson, O., Zhang, X. & Wallhagen, M. (2024). Carbon Assessment of a Wooden Single-Family Building: Focusing on Re-Used Building Products. Buildings, 14(3), Article ID 800.
Open this publication in new window or tab >>Carbon Assessment of a Wooden Single-Family Building: Focusing on Re-Used Building Products
2024 (English)In: Buildings, E-ISSN 2075-5309, Vol. 14, no 3, article id 800Article in journal (Refereed) Published
Abstract [en]

Previous research has shown a lack of studies with comparisons between primary (virgin) and secondary (re-used) building materials, and their embodied emissions. The creation of different scenarios comparing the environmental impact of virgin vs. re-used materials is also motivated by the scarcity of raw materials in the world and the emergency of mitigating greenhouse gas (GHG) emissions from buildings. The aim of this study was to investigate scenarios, including new vs. re-used building products, applying the LCA method for a wooden single-family building. The findings showed a 23% reduction potential for total released (positive) CO2e when comparing the Reference scenario with Scenario I, using re-used wooden-based materials. Further, Scenario II, using all re-used building materials except for installations, showed a 59% CO2e reduction potential compared to the Reference scenario. Finally, Scenario III, which assumes all re-used building products, showed a 92% decreased global warming potential (GWP) impact compared to the Reference scenario. However, when including biogenic carbon and benefits (A5 and D module), the Reference scenario, based on newly produced wooden building materials, has the largest negative GHG emissions. It can be concluded that the re-use of building products leads to significant carbon savings compared to using new building products.

Keywords
biogenic carbon; circularity; end-of-life (EOL); life cycle assessment (LCA); global warming potential (GWP); environmental impact; wood; single-family building
National Category
Environmental Analysis and Construction Information Technology Building Technologies
Identifiers
urn:nbn:se:hig:diva-43953 (URN)10.3390/buildings14030800 (DOI)
Available from: 2024-03-26 Created: 2024-03-26 Last updated: 2024-04-02Bibliographically approved
Ren, H., Bahrami, A., Cehlin, M. & Wallhagen, M. (2024). Flexural Behavior of Cross-Laminated Timber Panels with Environmentally Friendly Timber Edge Connections. Buildings, 14(5), Article ID 1455.
Open this publication in new window or tab >>Flexural Behavior of Cross-Laminated Timber Panels with Environmentally Friendly Timber Edge Connections
2024 (English)In: Buildings, E-ISSN 2075-5309, Vol. 14, no 5, article id 1455Article in journal (Refereed) Published
Abstract [en]

As a sustainable construction material, timber is more promoted than steel, concrete, and aluminum nowadays. The building industry benefits from using timber based on several perspectives, including decarbonization, improved energy efficiency, and easier recycling and disposal processes. The cross-laminated timber (CLT) panel is one of the widely utilized engineered wood products in construction for floors, which is an ideal alternative option for replacing reinforced concrete. One single CLT panel has an outstanding flexural behavior. However, CLT cannot be extended independently without external connections, which are normally made of steel. This article proposes two innovative adhesive-free edge connections made of timber, the double surface (DS) and half-lapped (HL) connections. These connections were designed to connect two CLT panels along their weak direction. Parametric studies consisting of twenty models were conducted on the proposed edge connections to investigate the effects of different factors and the flexural behavior of CLT panels with these edge connections under a four-point bending test. Numerical simulations of all the models were done in the current study by using ABAQUS 2022. Furthermore, the employed material properties and other relevant inputs (VUSDFLD subroutines, time steps, meshes, etc.) of the numerical models were validated through existing experiments. The results demonstrated that the maximum and minimum load capacities among the studied models were 6.23 kN and 0.35 kN, respectively. The load–displacement responses, strain, stress, and defection distributions were collected and analyzed, as well as their failure modes. It was revealed that the CLT panels’ load capacity was distinctly improved due to the increment of the connectors’ number (55.05%) and horizontal length (80.81%), which also reinforced the stability. Based on the findings, it was indicated that adhesive-free timber connections could be used for CLT panels in buildings and replace traditional construction materials, having profound potential for improving buildings’ sustainability and energy efficiency.

Place, publisher, year, edition, pages
MDPI, 2024
Keywords
cross-laminated timber; adhesive-free edge connection; load capacity; finite element method; flexural behavior; VUSDFLD subroutine
National Category
Civil Engineering
Identifiers
urn:nbn:se:hig:diva-44189 (URN)10.3390/buildings14051455 (DOI)
Available from: 2024-05-22 Created: 2024-05-22 Last updated: 2024-05-23Bibliographically approved
Honghao, R., Bahrami, A., Cehlin, M. & Wallhagen, M. (2024). Proposing new adhesive-free timber edge connections for cross-laminated timber panels: A step toward sustainable construction. Case Studies in Construction Materials, 20, Article ID e02975.
Open this publication in new window or tab >>Proposing new adhesive-free timber edge connections for cross-laminated timber panels: A step toward sustainable construction
2024 (English)In: Case Studies in Construction Materials, E-ISSN 2214-5095, Vol. 20, article id e02975Article in journal (Refereed) Published
Abstract [en]

The use of timber as a building material is becoming increasingly popular thanks to its superior environmental performance compared with concrete and steel. However, timber structures rely on solid connections to improve their weak expansibility. Steel connections can be prone to corrosion over time, leading to the decreased structural integrity. Additionally, steel connections require more material and energy to manufacture and install compared with timber connections. This article focuses on the flexural performance of cross-laminated timber (CLT) panels with adhesive-free edge connections under four-point bending tests. First, numerical models of experimentally tested CLT panels were constructed using the finite element (FE) software ABAQUS. Then, these FE models were validated with the comparisons of their results with those of the experimental tests. Afterward, four new adhesive-free edge connections using timber for the CLT panels were developed in this study, helping sustainable construction. Utilizing the designed edge connections of the current study, forty-one parametric studies were numerically conducted on the connected CLT panels to investigate their ultimate loads, strains, displacements, moment capacities, failure modes, and effective stiffness. The factors affecting the edge connections’ load-bearing capacity were also examined and discussed. The study provides helpful insights into the development of CLT as a sustainable construction material with improved adhesive-free edge connections.

Place, publisher, year, edition, pages
Elsevier, 2024
Keywords
Cross-laminated timber, Adhesive-free edge connections, Load-bearing capacity, Finite element method, Flexural performance, VUSDFLD subroutine
National Category
Civil Engineering
Identifiers
urn:nbn:se:hig:diva-43804 (URN)10.1016/j.cscm.2024.e02975 (DOI)001202324800001 ()2-s2.0-85186126820 (Scopus ID)
Available from: 2024-02-14 Created: 2024-02-14 Last updated: 2024-04-26Bibliographically approved
Dahlkvist, E., Wallhagen, M., Bergsten, E. L., Larsson, J. & Enmarker, I. (2023). First-line managers’ leadership behavior profiles and use of gardens in residential care facilities: An interview study. Journal of Aging and Environment, 37(1), 65-84
Open this publication in new window or tab >>First-line managers’ leadership behavior profiles and use of gardens in residential care facilities: An interview study
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2023 (English)In: Journal of Aging and Environment, ISSN 2689-2618, E-ISSN 2689-2626, Vol. 37, no 1, p. 65-84Article in journal (Refereed) Published
Abstract [en]

This study explored first-line managers’ leadership behavior profiles regarding their goals for utilizing the garden at residential care facilities for older people. Semi-structured interviews were conducted with a convenience sample of first-line managers (n = 12) in Sweden. Data were analyzed using deductive content analysis theoretically guided by the Three-dimensional Leadership Model. The results showed that the main leadership behavior profiles were related to the dimensions structure, relation and change. The managers emphasized workplace regulations and goals. They allowed staff to make decisions and encouraged them to see problems and opportunities.

Place, publisher, year, edition, pages
Taylor & Francis, 2023
Keywords
Older people, first-line managers, garden, leadership
National Category
Health Sciences
Research subject
Sustainable Urban Development
Identifiers
urn:nbn:se:hig:diva-37398 (URN)10.1080/26892618.2021.2001707 (DOI)000967885300004 ()2-s2.0-85119203641 (Scopus ID)
Funder
Forte, Swedish Research Council for Health, Working Life and Welfare, 2009-1761
Available from: 2021-11-19 Created: 2021-11-19 Last updated: 2024-04-05Bibliographically approved
Honghao, R., Bahrami, A., Cehlin, M. & Wallhagen, M. (2023). Literature Review on Development and Implementation of Cross-Laminated Timber. In: Proceedings of the 5th International Conference on Building Energy and Environment: . Paper presented at 5th International Conference on Building Energy and Environment (COBEE2022), 25-29 July 2022, Montreal, Canada. Singapore: Springer
Open this publication in new window or tab >>Literature Review on Development and Implementation of Cross-Laminated Timber
2023 (English)In: Proceedings of the 5th International Conference on Building Energy and Environment, Singapore: Springer, 2023Conference paper, Published paper (Refereed)
Abstract [en]

Achieving the targets of the Paris Agreement as an international treaty on climate change requires global climate actions by all sectors, including ensuring that buildings are more energy efficient. Today’s modern buildings employ a worldwide well-known and versatile usable building material which is a new type of green low-carbon engineered wood product, cross-laminated timber (CLT), for their structural frames. CLT as an innovative plate-shaped product provides a laminated structure and great physicomechanical characteristics. This article studies the development status and implementation of CLT in Europe, emphasizing its material properties and load-bearing characteristics. The newest findings related to CLT are reported. Also, the environmental benefits of using CLT in the construction industry are discussed. Moreover, the energy performance and performance of the utilized CLT elements are highlighted. According to our findings, the embodied energy and embodied carbon are significantly lower in CLT constructions compared with reinforced concrete and steel structures. Finally, the prospects of CLT are presented.

Place, publisher, year, edition, pages
Singapore: Springer, 2023
Series
Environmental Science and Engineering, ISSN 1863-5520
Keywords
Cross-laminated timber, Material properties, Load-bearing capacity, Low-carbon emission, Environmental benefit, Energy performance
National Category
Civil Engineering
Research subject
Sustainable Urban Development
Identifiers
urn:nbn:se:hig:diva-39648 (URN)10.1007/978-981-19-9822-5_36 (DOI)2-s2.0-85172736454 (Scopus ID)978-981-19-9821-8 (ISBN)978-981-19-9822-5 (ISBN)
Conference
5th International Conference on Building Energy and Environment (COBEE2022), 25-29 July 2022, Montreal, Canada
Available from: 2022-08-03 Created: 2022-08-03 Last updated: 2024-02-15Bibliographically approved
Johansson, L., Bahrami, A., Cehlin, M. & Wallhagen, M. (2023). Study on Properties and Performance of Green Concrete. In: Agnieszka Jedrzejewska, Fragkoulis Kanavaris, Miguel Azenha, Farid Benboudjema, Dirk Schlicke (Ed.), SynerCrete'23: International RILEM Conference on Synergising Expertise towards Sustainability and Robustness of Cement-based Materials and Concrete Structures: . Paper presented at International RILEM Conference on Synergising Expertise towards Sustainability and Robustness of Cement-based Materials and Concrete Structures, 14-16 June, Milos, Greece (pp. 23-35). Springer, 44
Open this publication in new window or tab >>Study on Properties and Performance of Green Concrete
2023 (English)In: SynerCrete'23: International RILEM Conference on Synergising Expertise towards Sustainability and Robustness of Cement-based Materials and Concrete Structures / [ed] Agnieszka Jedrzejewska, Fragkoulis Kanavaris, Miguel Azenha, Farid Benboudjema, Dirk Schlicke, Springer, 2023, Vol. 44, p. 23-35Conference paper, Published paper (Refereed)
Abstract [en]

Conventional concrete (CC) is for decades the most used construction material worldwide thanks to its good properties such as high strength, high thermal mass, low noise transmission, and high fire resistance. Cement is an important component of CC. The cement industry is a significant source of emissions and accounts for roughly 8% of the world’s CO2 emissions today, which means all improvements that can be made within this single industry benefit the emissions reduction goals. Green concrete (GC) is the development in the field of construction technology, which offers a more sustainable and eco-friendly solution as a building material. GC deals with the mentioned negative issue of cement, since it offers new cementitious matrices where some part of the Portland cement of CC is being replaced by some supplementary cementitious materials, such as industrial by-products, agricultural wastes, or municipal wastes. This paper studies the properties, structural performance, and environmental benefits of GCs. The investigation is done through a literature review, identifying the knowledge gaps, and providing suggestions for further research. The results indicate that there is a good potential to significantly reduce the climate impact of CC by using alternative binder materials in GC.

Place, publisher, year, edition, pages
Springer, 2023
Series
RILEM Bookseries ; 44
Keywords
green concrete, greenhouse gas emissions, Portland cement, alternative binder materials, climate impact
National Category
Civil Engineering
Identifiers
urn:nbn:se:hig:diva-42017 (URN)10.1007/978-3-031-33187-9_3 (DOI)2-s2.0-85162179085 (Scopus ID)9783031332104 (ISBN)
Conference
International RILEM Conference on Synergising Expertise towards Sustainability and Robustness of Cement-based Materials and Concrete Structures, 14-16 June, Milos, Greece
Available from: 2023-06-08 Created: 2023-06-08 Last updated: 2024-04-09Bibliographically approved
Cehlin, M., Lin, Y., Sandberg, M., Claesson, L. & Wallhagen, M. (2023). Towards benchmarking of urban air quality based on homogenous surface emission. Results in Engineering (RINENG), 20, Article ID 101617.
Open this publication in new window or tab >>Towards benchmarking of urban air quality based on homogenous surface emission
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2023 (English)In: Results in Engineering (RINENG), ISSN 2590-1230, Vol. 20, article id 101617Article in journal (Refereed) Published
Abstract [en]

Here, it is presented a possible methodology and experimental model for benchmarking of air quality in cities. The concept behind the methodology is that a city’s inherent structure affects the potential for contaminant removal due to the resistance it poses to inflow. The approach is based on homogenous emission across the street surface network, representing a worst-case situation. Different levels of complexity can be used for benchmarking, making it valuable for evaluating different layouts. Additionally, an urban ventilation index suitable for these kinds of experimental studies has been suggested. 

Place, publisher, year, edition, pages
Elsevier, 2023
Keywords
Urban ventilation, City ventilation, Air quality, Wind tunnel, Tracer gas, Experimental model
National Category
Fluid Mechanics and Acoustics
Research subject
Sustainable Urban Development
Identifiers
urn:nbn:se:hig:diva-43313 (URN)10.1016/j.rineng.2023.101617 (DOI)001127737100001 ()2-s2.0-85178337839 (Scopus ID)
Funder
Swedish Research Council Formas, 2018-00238
Available from: 2023-11-22 Created: 2023-11-22 Last updated: 2024-01-04Bibliographically approved
Wallhagen, M. & Cehlin, M. (Eds.). (2023). Urban Transition - Perspectives on Urban Systems and Environments. IntechOpen
Open this publication in new window or tab >>Urban Transition - Perspectives on Urban Systems and Environments
2023 (English)Collection (editor) (Refereed)
Abstract [en]

This book assembles the latest knowledge linked to urban environments and urban socio-eco-technological systems including urban, energy, transport, material, and ecosystems. 

Urban environments and systems affect every person’s life in many ways and can have negative impacts on the local and global environment. They create value but sometimes with a high environmental cost from a lifecycle perspective.  Therefore, scientists and global leaders call for an urban transition to create more environmental urban environments and systems that are climate positive, sustainable, and healthy, which is necessary for society to function within the planetary boundaries. This is a great challenge. Huge transformations and new ways of thinking regarding the design and co-existence of technical, social, and ecological systems are necessary to turn the present challenge into opportunities. This book, Urban Transition - Perspectives on Urban Systems and Environments, explores this challenge and several different topics related to possible, probable, or necessary urban transitions in the urban environment. It assembles a variety of authors who present many aspects and the latest knowledge linked to urban transitions of the urban environment and urban socio-eco-technological systems - including urban-, energy-, transport-, building- material- and eco-systems.

Furthermore, the importance of the urban systems and urban environments is seldom clearly linked to their impact on the environment and humans. This book examines this gap, the crucial issues relating to how urban systems influence the urban structure, and how they can be formed and designed to become more sustainable. It explores the link between the complex systems in cities, the physicality of the built environment, and the living environments for the people. The book proposes a rich garden of ideas to provoke and develop current research, debate, and new forms of practices.

Place, publisher, year, edition, pages
IntechOpen, 2023. p. 276
Keywords
Urban Transition, urban sustainability, resilience, buildings, architecture
National Category
Civil Engineering
Research subject
Sustainable Urban Development
Identifiers
urn:nbn:se:hig:diva-43354 (URN)10.5772/intechopen.94994 (DOI)978-1-83962-412-4 (ISBN)978-1-83962-414-8 (ISBN)
Available from: 2023-12-01 Created: 2023-12-01 Last updated: 2024-01-11Bibliographically approved
Pastori, S., Sergio Mazzucchelli, E. & Wallhagen, M. (2022). Hybrid timber-based structures: A state of the art review. Construction and Building Materials, 359, Article ID 129505.
Open this publication in new window or tab >>Hybrid timber-based structures: A state of the art review
2022 (English)In: Construction and Building Materials, ISSN 0950-0618, E-ISSN 1879-0526, Vol. 359, article id 129505Article in journal (Refereed) Published
Abstract [en]

The construction of timber buildings has increased in recent years, thanks to the excellent properties of the material. To achieve improved behaviour in terms of mechanical properties, energy and acoustic performance, fire resistance and durability, timber structures are sometimes integrated with other materials, such as concrete and steel, resulting in hybrid timber-based structures. This paper presents a literature review on hybrid timber-based structures, summarizing the state of the art of hybrid timber-based structures constructed to date and examining the main research contributions. The aim is to establish a background for improving existing solutions or proposing new hybrid timber-based systems and components.

Place, publisher, year, edition, pages
Elsevier, 2022
Keywords
Timber, Concrete, Steel, Timber-concrete composite, Steel-timber composite, Hybrid systems, Structural behaviour, Thermal behaviour, Sustainability, Prefabrication
National Category
Building Technologies
Identifiers
urn:nbn:se:hig:diva-40361 (URN)10.1016/j.conbuildmat.2022.129505 (DOI)000882300400001 ()2-s2.0-85140475061 (Scopus ID)
Available from: 2022-11-07 Created: 2022-11-07 Last updated: 2022-12-01Bibliographically approved
Projects
Stadsventilation [2018-00238_Formas]; University of Gävle; Publications
Cehlin, M., Lin, Y., Sandberg, M., Claesson, L. & Wallhagen, M. (2023). Towards benchmarking of urban air quality based on homogenous surface emission. Results in Engineering (RINENG), 20, Article ID 101617. Lin, Y., Sandberg, M., Cehlin, M., Claesson, L. & Wigö, H. (2022). Evaluation of the Equivalent Purging Flow Rate for Single-side Ventilated Model with Tracer Gas Measurements. In: 5th International Conference on Building Energy and Environment (COBEE 2022): . Paper presented at COBEE 2022, Concordia University, Montreal, Canada, 25-29 July 2022. Springer, Article ID 1419. Buccolieri, R., Lin, Y., Wigö, H. & Sandberg, M. (2021). Drag force rose representing the interaction between urban geometries and wind. In: 15th ROOMVENT (Roomvent 2020) virtual conference: Energy efficient ventilation for healthy future buildings. Paper presented at 15th Roomvent virtual conference, 15-17 February 2021, Turin, Italy (pp. 85-88). Cehlin, M., Ameen, A., Sandberg, M., Claesson, L., Wigö, H. & Lin, Y. (2020). Urban Morphology and City Ventilation. In: : . Paper presented at 10th International Conference on Future Environment and Energy (ICFEE 2020).
Environmental requirements, Energy Use and Climate Impact & Relations and Possibilities [P47844-1_Energi]; University of Gävle; Publications
Hayati, A. & Akander, J. (2022). Influence of energy units in building certification system, Miljöbyggnad: A case study of a school building in Sweden. In: Proceedings of the 5th International Conference on Building Energy and Environment (COBEE 2022): . Paper presented at COBEE 2022, Concordia University, Montreal, Canada, 25-29 July 2022. , Article ID 1391.
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ORCID iD: ORCID iD iconorcid.org/0000-0001-8413-3975

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