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Publications (10 of 78) Show all publications
Norén, J., Pousette, A. & Sandberg, K. (2019). Moisture Safety of Tall Timber Facades—LCA and LCC Calculations of Damage Scenarios. In: Johansson, Dennis; Bagge, Hans; Wahlström, Åsa (Ed.), Cold Climate HVAC 2018: . Paper presented at 9th Int Cold Climate Conference. Kiruna, Sweden. 12-15 March, 2018. (pp. 933-943).
Open this publication in new window or tab >>Moisture Safety of Tall Timber Facades—LCA and LCC Calculations of Damage Scenarios
2019 (English)In: Cold Climate HVAC 2018 / [ed] Johansson, Dennis; Bagge, Hans; Wahlström, Åsa, 2019, p. 933-943Conference paper, Published paper (Refereed)
Abstract [en]

The use of timber structures in tall buildings increases the demand of moisture safety in facades. Moisture in the facade could result in unwanted consequences such as mold, decay and distortions in wood materials. This might have impact on the indoor climate and the building quality. The aim of this study was to evaluate the moisture safety regarding the composition of the façade and connection details such as windows and balconies. Scenarios with possible damages were evaluated with LCC (Life Cycle Cost) and LCA (Life Cycle Assessment). The scenarios were developed based on experiences from manufacturers and insurance companies and on research investigations of damages. LCC and LCA includes replacement of damaged building materials, transports of new materials and damaged materials for recycling or energy recovery and the use of energy for drying of moisture in the structure. Both light frame structures and CLT (Cross Laminated Timber) structures were included. Improvements of detail connections to increase moisture safety were also evaluated regarding risk of damage, costs and environmental impact. The results show that even small and inexpensive improvements will increase the moisture safety and significantly reduce the risk of damage.

National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-37732 (URN)978-3-030-00661-7 (ISBN)
Conference
9th Int Cold Climate Conference. Kiruna, Sweden. 12-15 March, 2018.
Available from: 2019-02-13 Created: 2019-02-13 Last updated: 2019-02-14Bibliographically approved
Sandberg, K., Gustafsson, A., Pousette, A., Norén, J. & Soleimani-Mohseni, M. (2019). Renovation of an Office Building with Prefabricated Wooden Element—Case Hedensbyn. In: Johansson, Dennis; Bagge, Hans; Wahlström, Åsa (Ed.), Cold Climate HVAC 2018: . Paper presented at 9th Int Cold Climate Conference. Kiruna, Sweden. 12-15 March 2018 (pp. 587-598).
Open this publication in new window or tab >>Renovation of an Office Building with Prefabricated Wooden Element—Case Hedensbyn
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2019 (English)In: Cold Climate HVAC 2018 / [ed] Johansson, Dennis; Bagge, Hans; Wahlström, Åsa, 2019, p. 587-598Conference paper, Published paper (Refereed)
Abstract [en]

There is a major need of cost-effective renovation that leads to lower energy consumption and better environment. This article shows the results from a pilot case of a newly developed prefabricated building system. It is an industrially prefabricated insulated wooden element adapted to renovation and upgrading of building envelopes. The renovated building is a one-story office building located in Skellefteå in the north of Sweden. Energy performance, thermal bridges, risk of moisture problems, LCA, applicability of the renovation method and assembly time were evaluated during the planning and execution of the renovation. Results from this case show that the elements were very light and easy for one person to handle at the building site. There is a great potential to reduce assembly time with improved joints and element sizes adapted to the building as well as improved batch packaging from the factory. With 100 mm insulation, the renovation gives a certain energy savings, and LCA calculations show that the reduction of climate impact due to reduced heating energy used during a service life 50 years corresponds to the climate impact of the renovation measures. The risk of microbial growth can be regarded as small.

National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-37731 (URN)978-3-030-00661-7 (ISBN)
Conference
9th Int Cold Climate Conference. Kiruna, Sweden. 12-15 March 2018
Available from: 2019-02-13 Created: 2019-02-13 Last updated: 2019-02-13Bibliographically approved
Peñaloza, D., Erlandsson, M. & Pousette, A. (2018). Climate impacts from road bridges: effects of introducing concrete carbonation and biogenic carbon storage in wood. Structure and Infrastructure Engineering, 14(1), 56-67
Open this publication in new window or tab >>Climate impacts from road bridges: effects of introducing concrete carbonation and biogenic carbon storage in wood
2018 (English)In: Structure and Infrastructure Engineering, Vol. 14, no 1, p. 56-67Article in journal (Refereed) Published
Abstract [en]

The construction sector faces the challenge of mitigating climate change with urgency. Life cycle assessment (LCA), a widely used tool to assess the climate impacts of buildings, is seldom used for bridges. Material-specific phenomena such as concrete carbonation and biogenic carbon storage are usually unaccounted for when assessing the climate impacts from infrastructure. The purpose of this article is to explore the effects these phenomena could have on climate impact assessment of road bridges and comparisons between bridge designs. For this, a case study is used of two functionally equivalent design alternatives for a small road bridge in Sweden. Dynamic LCA is used to calculate the effects of biogenic carbon storage, while the Lagerblad method and literature values are used to estimate concrete carbonation. The results show that the climate impact of the bridge is influenced by both phenomena, and that the gap between the impacts from both designs increases if the phenomena are accounted for. The outcome is influenced by the time occurrence assumed for the forest carbon uptake and the end-of-life scenario for the concrete. An equilibrium or 50/50 approach for accounting for the forest carbon uptake is proposed as a middle value compromise to handle this issue. © 2017 Informa UK Limited, trading as Taylor & Francis Group

Keywords
Life cycles, wooden bridges, concrete bridges, environmental engineering, climate change, biogenic carbon storage, concrete carbonation
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-29760 (URN)10.1080/15732479.2017.1327545 (DOI)2-s2.0-85019192178 (Scopus ID)
Available from: 2017-06-02 Created: 2017-06-02 Last updated: 2019-01-03Bibliographically approved
Sandberg, K., Pousette, A. & Östman, L. (2018). Concept for renovation of facades with prefabricated wood elements. Skellefteå
Open this publication in new window or tab >>Concept for renovation of facades with prefabricated wood elements
2018 (English)Report (Other academic)
Abstract [en]

There is a major need of cost-effective renovations that lead to lower energy consumption and better environment. The aim of a Nordic built project was to develop a concept for industrially prefabricated insulated elements for renovation and upgrading of building envelopes. The project with participants from Sweden, Finland and Norway focused on increased prefabrication based on wood for a sustainable solution. This report presents results from the project including a Swedish pilot case with the newly developed prefabricated building system. The prefabricated wood elements are produced by Termowood in Norway. Several studies have been done about renovation of facades, including attitudes and costs, and about important properties of the element system, for example energy savings, thermal bridges, moisture risks, environmental impacts, production and installation.

The renovated building in the pilot case is a one-storey office building located in Skellefteå in the north of Sweden. Energy performance, thermal bridges, risk of moisture problems, LCA, applicability of the renovation method and assembly time were evaluated during the planning and execution of the renovation. Results from this pilot case showed that the elements were very light and easy for one person to handle at the building site. There is a great potential to further reduce the assembly time on site with improved joints and element sizes adapted to the building as well as improved batch packaging from the factory. With 100 mm insulation, the renovation gives a certain energy saving. LCA calculations showed that the reduction of climate impact due to energy savings during a service life of 50 years corresponds to the climate impact of the renovation measures. With a thicker insulation, the reduction in climate impact during the use phase of the building would increase more than the climate impact of the renovation. There is also a potential to reduce climate impact from the wall element by selecting materials produced closer to the element factory and with a greater share of renewable energy.

Place, publisher, year, edition, pages
Skellefteå: , 2018. p. 28
Series
RISE Rapport ; 2018:26
Keywords
Façade renovation, Building envelope, Prefabricated wood element, Energy efficiency, Thermal bridge, Insulation, Climate impact, Retrofitting
National Category
Building Technologies
Identifiers
urn:nbn:se:ri:diva-35137 (URN)978-91-88695-63-5 (ISBN)
Funder
Nordic Council of MinistersSwedish Energy AgencySwedish Research Council FormasEuropean Regional Development Fund (ERDF)
Available from: 2018-09-07 Created: 2018-09-07 Last updated: 2018-09-11Bibliographically approved
Sandberg, K., Pousette, A., Norén, J., Sandberg, M., Olofsson, T. & Mukkavaara, J. (2018). Hållbarhetsutvärdering av byggnader - Case Ripan i Kiruna.
Open this publication in new window or tab >>Hållbarhetsutvärdering av byggnader - Case Ripan i Kiruna
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2018 (Swedish)Report (Other academic)
Abstract [en]

Sustainability includes several parameters, and these can be measured and valued in many different ways. This study focuses on balancing the various parts to achieve sustainability by minimizing energy for heating and energy to produce the materials used in the building as well as minimizing cost for material investment and cost for heating using optimization techniques. This is balanced together with the environmental impact. This report describes an initial study for sustainability optimization of a smaller building. The goal is to develop a comprehensive approach to provide a broader basis of decisions for new construction.

The calculation included the building envelope (exterior walls, roof and floors), interior walls and stabilizing elements for different frames of wood (timber frame and CLT).

The result from the Ripan Case shows that the timber frame design has the lowest embodied energy and operating energy, and lowest cost for investment and heating during the operating phase. The environmental impact of the timber frame design was also low.

Abstract [sv]

Hållbarhet innefattar flera parametrar och dessa kan mätas och värderas på många olika sätt. Att väga ihop de olika delarna för att uppnå hållbarhet genom att minimera förbrukad energi för uppvärmning och energi för att producera material till bygget samt investeringskostnader för material och kostnader för uppvärmning är fokus i denna rapport. Detta vägs samman med miljöpåverkan. En inledande studie för hållbarhetsoptimering av en mindre byggnad är genomförd med målet är att utveckla en övergripande metod för att ge bredare beslutsunderlag vid nybyggnad.

Beräkningar av inbyggd energi, driftsenergi, investerings- och uppvärmningskostnader har genomförts för ett planerat hus på Camp Ripan i Kiruna. I beräkningen av byggnaden inkluderades klimatskärm (ytterväggar, stomstabiliserande element och grund) för två olika stommar av trä (träregelstomme och KL-trä). För miljöberäkningarna användes främst indata från EPDer och resultatet redovisas i form av klimatpåverkan, CO2-ekvivalenter.

Den utvecklade metoden ger potential för bättre ekologisk och ekonomisk hållbarhet genom ett optimerat val av byggnadsmaterial för byggnader. Optimeringsalgoritmen ger förslag på byggnadsmaterial med minst energiåtgång vid produktion, den sk inbyggda energin, samt vid uppvärmning under driftsfasen samt lägst kostnader. Miljöaspekten vägs också in i bedömningen för att få ett mer heltäckande beslutsunderlag för beställare och projektörer. Metoden är tänkt att i fortsatta studier vidareutvecklas för användning på mer komplexa byggnader som till exempel flerbostadshus.

Resultatet från Case Ripan visar att regelkonstruktionen har lägst inbyggd energi, driftsenergi, investeringskostnad samt kostnad för uppvärmning under driftsfasen. Även miljöpåverkan från regelkonstruktionen var låg.

Publisher
p. 33
Series
RISE Rapport ; 2018:79
Keywords
Sustainability, low energy house, energy optimization, LCA, timber house
National Category
Engineering and Technology
Identifiers
urn:nbn:se:ri:diva-37853 (URN)978-91-88907-33-2 (ISBN)
Funder
Swedish Agency for Economic and Regional GrowthVinnova
Available from: 2019-02-28 Created: 2019-02-28 Last updated: 2019-04-05Bibliographically approved
Gustafsson, A., Pousette, A., Hagman, O. & Ekevad, M. (2017). Conference proceedings, ICTB 2017, 3rd International Conference on Timber Bridges.
Open this publication in new window or tab >>Conference proceedings, ICTB 2017, 3rd International Conference on Timber Bridges
2017 (English)Report (Other (popular science, discussion, etc.))
Abstract [en]

Conference proceedings from the conference ICTB 2017, the 3rd International Conference on Timber Bridges, 26-29 June 2017 in Skellefteå, Sweden. Content of the conference is presented in the Conference programme included in these proceedings on pages 3-10.  Papers presented at the conference were distributed on USB to participants at the conference.

The conference contained 5 Keynote presentations and 45 Technical papers presented in 10 sessions, and also a technical visit to wooden buildings and bridges in Skellefteå.

A pre-tour included visit to several timber bridges between Skellefteå and Umeå, and the pretour programme is included in these proceedings on pages 11-15.

Publisher
p. 16
Series
SP Rapport, ISSN 0284-5172 ; 2017:26
Keywords
timber bridge, design, moisture, monitoring, testing, joints, durability, LCA, timber-concrete bridge, historical timber bridges, FEM analyses, case studies
National Category
Engineering and Technology
Identifiers
urn:nbn:se:ri:diva-32388 (URN)
Available from: 2017-10-26 Created: 2017-10-26 Last updated: 2018-08-20Bibliographically approved
Pousette, A., Malo, K. A., Thelandersson, S., Fortino, S., Salokangas, L. & Wacker, J. (2017). Durable Timber Bridges - Final Report and Guidelines. Skellefteå
Open this publication in new window or tab >>Durable Timber Bridges - Final Report and Guidelines
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2017 (English)Report (Other academic)
Abstract [en]

This is the final report from the project DuraTB - Durable Timber Bridges. The goal of the project was to contribute to the development of sustainable timber bridges by making guidelines for moisture design and developing new and improved bridge concepts and details in terms of durability and maintenance aspects.

In this report the analyzes, surveys, results and guidelines are described. More detailed descriptions are referred to the many publications that the project has delivered.

The research leading to these results has received funding from the WoddWisdom-Net Research Programme which is a transnational R&D programme jointly funded by national funding organisations within the framework of the ERA-NET WoodWisdom-Net 2.

Place, publisher, year, edition, pages
Skellefteå: , 2017. p. 177
Series
SP Rapport, ISSN 0284-5172 ; 2017:25
Keywords
timber bridges, durability, moisture, design, timber bridge consepts, timber bridge details
National Category
Infrastructure Engineering
Identifiers
urn:nbn:se:ri:diva-30000 (URN)
Projects
DuraTB - Durable Timber Bridges
Funder
VINNOVA
Available from: 2017-06-27 Created: 2017-06-27 Last updated: 2019-01-22Bibliographically approved
Pousette, A., Jacobsson, P., Johansson, E., Nilsson, L.-O. & Warg, C. (2017). Improved edge design for stress-laminated decks made of spruce. In: : . Paper presented at ICTB 2017, 3rd International Conference on Timber Bridges Skellefteå, Sweden. 26-29 June, 2017.
Open this publication in new window or tab >>Improved edge design for stress-laminated decks made of spruce
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2017 (English)Conference paper, Published paper (Refereed)
Abstract [en]

Stress-laminated bridge decks in Sweden are usually made of glulam beams of spruce and it is therefore crucial to avoid moisture as the wood has no impregnation that can protect it from decay. Typically the protection of the deck consists of a waterproof bitumen sheet under the asphalt layers on the top surface and of claddings along the edges. The aim of this work was to study the risk of damages and how to ensure the function of the deck plates. The adhesion of bitumen sheets and the effect of different primers was studied. The design at the edges was studied and an improved solution with a steel angle along the deck edge was developed and tested. The improved design should be robust and easy to install to always assure a correct performance. The new design has been developed within the European research project DuraTB - Durable Timber Bridges and is now included in general recommendations for timber bridges in Sweden.

Keywords
timber bridge, stress-laminated deck, waterproof bitumen sheet, bitumen primer, edge
National Category
Infrastructure Engineering
Identifiers
urn:nbn:se:ri:diva-32394 (URN)
Conference
ICTB 2017, 3rd International Conference on Timber Bridges Skellefteå, Sweden. 26-29 June, 2017
Funder
VINNOVA
Note

DuraTB - Durable Timber Bridges

Available from: 2017-10-26 Created: 2017-10-26 Last updated: 2019-02-05Bibliographically approved
Norén, J., Pousette, A. & Sandberg, K. (2017). Moisture safety of tall timber facades. Borås
Open this publication in new window or tab >>Moisture safety of tall timber facades
2017 (English)Report (Other academic)
Abstract [en]

Moisture safety of tall timber facades

The main purpose of the project was to facilitate safe design of sustainable and cost-effective solutions for wood facades of high-rise buildings. Studies have been carried out of different designs of the wall itself and of different details in the wall. Direct and indirect consequences of moisture damage have been considered but mainly risk of mould or decay. Façade details with high risk were identified e.g. window and balcony, and the types of damage that may occur, and what the consequences may be. Based on this, some damage scenarios were selected where detailed solutions were analysed more carefully. Details were also compared with modified designs with improvements such as addition of a sealing strip or plate covering. LCA and LCC have been calculated for some damage scenarios to show consequences of damages and the importance of well-executed designs and details.

Place, publisher, year, edition, pages
Borås: , 2017. p. 47
Series
SP Rapport, ISSN 0284-5172 ; 2017:38
Keywords
timber facades, tall facades, moisture safety, wood moisture, damage scenarios, LCA, LCC
National Category
Engineering and Technology
Identifiers
urn:nbn:se:ri:diva-33483 (URN)
Projects
Tall Timber Facades
Funder
VINNOVA
Available from: 2018-03-09 Created: 2018-03-09 Last updated: 2018-08-20Bibliographically approved
Fortino, S., Hradil, P., Genoese, A., Pousette, A. & Fjellström, P. (2016). A multi-Fickian hygro-thermal model for timber bridge elements under Northern Europe climates. In: : . Paper presented at World Conference on timber engineering (WCTE 2016). Vienna, Austria. 22-25 August, 2016..
Open this publication in new window or tab >>A multi-Fickian hygro-thermal model for timber bridge elements under Northern Europe climates
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2016 (English)Conference paper, Oral presentation only (Other academic)
Abstract [en]

This work proposes a multi-Fickian method to analyse the hygro-thermal behaviour of timber bridge elements under Northern Europe climates. A temperature-dependent wood hysteresis is included in the model and the thermal effects due to temperatures above and below zero are taken into account. As a case study, the model is used for the hygro-thermal simulation of a glulam beam of Älsvbacka bridge in North of Sweden that was monitored by using wireless sensors in a previous study. The model, implemented in Abaqus FEM code, is able to predict the states of moisture and temperature in protected parts of the beam by using as external loads the relative humidity and temperature of the air provided by in-situ measurements. Furthermore a simplified model using a wood hysteresis independent of temperature is found to provide similar results and appears easier to implement in finite element codes.

National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-16282 (URN)2-s2.0-85011004556 (Scopus ID)9783903039001 (ISBN)
Conference
World Conference on timber engineering (WCTE 2016). Vienna, Austria. 22-25 August, 2016.
Available from: 2016-10-19 Created: 2016-10-19 Last updated: 2019-01-04Bibliographically approved
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0003-0757-1909

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