Project

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WooCon (wood-based concrete: building construction with composite elements of wood-concrete compounds and timber)

Applicant Zwicky Daia
Number 136918
Funding scheme NRP 66 Resource Wood
Research institution Kompetenzgruppe "Tragwerke & Verstärkungen" iCEN Hochschule für Technik und Architektur
Institution of higher education University of Applied Sciences and Arts Western Switzerland - HES-SO
Main discipline Civil Engineering
Start/End 01.09.2012 - 31.03.2017
Approved amount 496'952.00
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All Disciplines (4)

Discipline
Civil Engineering
Material Sciences
Other disciplines of Environmental Sciences
Technical Physics

Keywords (11)

fire safety; acoustic insulation; design approaches; structural wall elements; structural floor elements; use of forest waste products; timber-concrete composites; thermal insulation & storage capacity; lightweight wood-concrete; interface shear connectors

Lay Summary (German)

Lead
Holz und Holz-Leichtbeton als Baustoffe der Zukunft? Dieses Projekt befasst sich mit der Entwicklung neuer Grundlagen für tragende Bauteile, die aus Holz und Holz-Leichtbeton bestehen. Neben der verbesserten statischen Tragfähigkeit können diese neuartigen Bauelemente auch wirtschaftliche und ökologische Vorteile (Gewichtsreduktion, Wärme- und Schallisolation, Brandbeständigkeit, Wärmespeicher, Wiederverwendbarkeit in der Strom- und Wärmegewinnung) bieten.
Lay summary

Hintergrund
Zementgebundene Holzprodukte werden heutzutage vor allem für nicht tragende Zwecke eingesetzt. Dabei wäre Holz-Leichtbeton in neuartiger Zusammensetzung auch in Decken- und Wandelementen einsetzbar, und könnte damit einen Beitrag an den Tragwiderstand leisten. Gegenwärtig sind die Kenntnisse für eine praktische Anwendung von Tragelementen mit Holz-Leichtbeton jedoch noch zu gering. Es fehlen insbesondere Angaben dazu, welche Zusammensetzung der Holz-Leichtbeton für einen bestimmten Einsatzzweck aufweisen sollte, welcher Art die verwendeten Verbindungsmittel sein sollen, wie ganze Decken- oder Wandelemente wirtschaftlich konzipiert werden.

Ziel
Das Projekt zielt darauf ab, Leichtbetonmischungen mit unterschiedlich vorbehandelten Holzbestandteilen zu entwickeln und deren Eignung als tragender Baustoff zu prüfen. Die Ergebnisse gehen in einen konzeptionellen Tragwerksentwurf von Decken- und Wandelementen ein und werden mit Versuchen an Verbindern für die einzelnen Komponenten ergänzt. Mit Hilfe von bisher im Holzbau kaum angewendeten Bemessungsmethoden prognostizieren die Forschenden das Tragverhalten ganzer Bauteile bis zum Bruch und prüfen es in Belastungsversuchen im Grossmassstab. Über weitere Vorversuche und Fallstudien beurteilen die Forschenden die weiter zu erwartenden Vorteile, beispielsweise für die Wärmeisolation und -speicherung, für den Brand- und Schallschutz und in Bezug auf die wirtschaftliche Wettbewerbsfähigkeit.

Bedeutung
Tragende Bauteile mit Holz-Leichtbeton sind leichter und bieten einen integrierten Schall- und Brandschutz. Dank des hohen Holzanteils basieren die neuartigen Bauteile weitgehend auf erneuerbaren Ressourcen, sind wärmeisolierend und -speichernd, und können nach ihrem Abbruch in der Wärme- und Stromgewinnung wiederverwendet werden. Die zu entwickelnden Bemessungsansätze, bislang den traditionellen Baustoffen Stahl und Stahlbeton vorbehalten, könnten das Bauen mit Holz und Holzprodukten effizienter machen.

Direct link to Lay Summary Last update: 29.01.2013

Lay Summary (French)

Lead
Bois et béton de bois allégé: les matériaux de demain? Ce projet porte sur le développement de nouvelles bases concernant les éléments porteurs constitués de bois et de béton de bois allégé. Outre une meilleure portance statique, ces éléments de construction novateurs peuvent également présenter des avantages économiques et écologiques (réduction du poids, isolation thermique et insonorisation, résistance au feu, récupération de chaleur).
Lay summary

Contexte
Les produits à base de bois liés au ciment sont surtout utilisés à des fins autres que porteuses. Le béton de bois allégé pourrait pourtant tout aussi bien entrer dans de nouvelles compositions destinées aux éléments de plafonds et de murs, et contribuer ainsi à la résistance porteuse. Les données manquantes concernent surtout la composition du béton de bois allégé requise en fonction des différentes utilisations, le type de liant indiqué, les moyens rentables de conception d’éléments de plafond ou de mur et les méthodes possibles de dimensionnement de ces éléments de construction.

But
Le projet a pour objectif de développer des mélanges de béton allégé faisant intervenir différentes composantes de bois prétraité et de vérifier leur adéquation en tant que matériau porteur. Les résultats débouchent sur un projet conceptuel de structure porteuse d’éléments de plafond et de murs. A l’aide de méthodes de dimensionnement encore peu appliquées à ce jour dans le secteur de la construction en bois, les chercheurs pronostiquent le comportement porteur jusqu'au point de rupture d'éléments de construction complets. Par d’autres expériences préalables et études de cas, les chercheurs évaluent les autres avantages escomptés, notamment en termes d’isolation thermique et de récupération de chaleur, de protection contre le feu et d’insonorisation.

Portée
Les éléments porteurs en béton de bois allégé présentent un poids moindre ainsi qu’une insonorisation et une protection contre le feu intégrées. De par leur teneur élevée en bois, ces éléments de construction innovants sont largement basés sur des ressources renouvelables, ils sont isolants thermiques, emmagasinent la chaleur et peuvent être recyclés en chaleur ou en électricité après leur démontage. Les approches de dimensionnement à développer, jusqu’alors réservées aux matériaux traditionnels que sont l’acier et le béton armé, pourraient accroître l’efficacité de la construction en bois.

Direct link to Lay Summary Last update: 29.01.2013

Lay Summary (English)

Lead
Wood and wood-based concrete: The building material of the future? This project focuses on the development of new principles for load-bearing elements made of wood or wood-based concrete. Alongside the improved static load-bearing capacity, these innovative building elements also offer economic and ecological ad-vantages (weight reduction, thermal and acoustic insulation, fire protection, heat storage, reusability as source of heat and electricity).
Lay summary

Background
Cement-bonded wood products are today mainly used for non-load-bearing purposes. However, wood-based concrete in a new mixture could also be used in ceilings and wall elements and could thus make a contribution also to load-bearing. That said, knowledge about load-bearing elements involving wood-based concrete is still too limited for practical application to go ahead. In particular, data is lacking on the composition of wood-based concrete for specific uses, on the nature of the joints to be used, on how whole ceilings and wall elements can be planned economically and on the dimensioning methods to be applied to these elements.

Aim
The project aims to develop mixtures of lightweight concrete with different pre-treated wood components and to assess their suitability as load-bearing materials. The results will flow into a conceptual structural design of ceilings and wall elements and will be complemented by experiments with joints for the individual components. Applying dimensioning methods that have rarely been used before in wood construction, the researchers will predict the bearing capacity of entire building elements through to fracture and study it in load tests at a large scale. Practice-oriented dimensioning approaches will be derived from the results. Based on further pre-experiments and case studies, the researchers will assess other expected ad-vantages.

Significance
Load-bearing elements containing wood-based concrete are lighter in weight and offer integrated noise and fire protection. Thanks to the high share of wood, these innovative building elements are largely based on renewable resources and provide thermal insulation and storage. They can moreover be used as source of heat and electricity after their dismantling. The dimensioning methods to be developed could make construction with wood and wood-based products more efficient and thus contribute to the appropriate use of Swiss forests and Swiss wood.

Direct link to Lay Summary Last update: 29.01.2013

Responsible applicant and co-applicants

Employees

Publications

Publication
Bond behavior of steel and timber reinforcement in wood-cement compounds
Maeder Marco, Zwicky Daia (2017), Bond behavior of steel and timber reinforcement in wood-cement compounds, in 2nd Concrete Innovation Conference, TromsoCIC, Tromso.
Ecological Performance of Timber / Wood-Cement Compound Composite Slabs
Maeder Marco, Zwicky Daia (2016), Ecological Performance of Timber / Wood-Cement Compound Composite Slabs, in Sustainable Built Environment (SBE) regional conference, Zurichvdf, Zurich.
Multi-functional features of pourable wood-cement compounds – mechanical, building-physical, economic and ecological performance
Maeder Marco, Zwicky Daia (2016), Multi-functional features of pourable wood-cement compounds – mechanical, building-physical, economic and ecological performance, in World Conference on Timber Engineering, ViennaUniversity of Technology, Vienna.
Pourable Wood-Cement Compounds – Properties, Potential and Challenges of a New Structural Material
Macchi Niccolò, Zwicky Daia (2016), Pourable Wood-Cement Compounds – Properties, Potential and Challenges of a New Structural Material, in 3rd International Conference on Structures and Architecture, GuimarãesCRC Press/Balkema, Leiden.
Slab Elements made of Timber and Wood-Cement Compounds – Structural Performance and Eco-Balance
Eymard Mathieu, Zwicky Daia (2016), Slab Elements made of Timber and Wood-Cement Compounds – Structural Performance and Eco-Balance, in 3rd International Conference on Structures and Architecture, GuimarãesCRC Press/Balkema, Leiden.
Wall Elements made of Timber and Wood-Cement Compounds – Building-Physical Properties and Structural Performance
Macchi Niccolò, Zwicky Daia (2016), Wall Elements made of Timber and Wood-Cement Compounds – Building-Physical Properties and Structural Performance, in 3rd International Conference on Structures and Architecture, GuimarãesCRC Press/Balkema, Leiden.
Combustibility of Wood-Cement Compounds
Zwicky Daia (2015), Combustibility of Wood-Cement Compounds, in 10th Conference on Advanced Building Skins, BernABS, Berne.
Economic and ecological performance of WCC-based wall elements
Fadai Alireza, Winter Wolfgang (2015), Economic and ecological performance of WCC-based wall elements, in 10th Conference on Advanced Building Skins, BernABS, Berne.
Enhanced fire behaviour of wood-based buildings by resource-efficient material wood lightweight concrete
Fadai Alireza, Winter Wolfgang (2015), Enhanced fire behaviour of wood-based buildings by resource-efficient material wood lightweight concrete, in Fire Safety of Green Buildings, BerlinShaker Verlag GmbH, Berlin.
Entwicklung von Innendämm-Verbundelementen basierend auf Holzfaser - in situ Messung hygrothermischer Performance
Nackler Joachim Nathanael, Wegerer P., Fadai Alireza, Winter Wolfgang (2015), Entwicklung von Innendämm-Verbundelementen basierend auf Holzfaser - in situ Messung hygrothermischer Performance, in ÖkoSan 15, GrazAEE INTEC, Gleisdorf.
Mechanical Properties of Wood-Cement Compounds
Zwicky Daia (2015), Mechanical Properties of Wood-Cement Compounds, in 10th Conference on Advanced Building Skins , BernABS, Berne.
Numerical simulations of the overall building-physical performance of wood-cement compound-based building skins
Fadai Alireza, Nackler Joachim Nathanael (2015), Numerical simulations of the overall building-physical performance of wood-cement compound-based building skins, in 10th Conference on Advanced Building Skins, BernABS, Berne.
Thermal and acoustic insulation properties of Wood-cement compounds
Fadai Alireza, Winter Wolfgang (2015), Thermal and acoustic insulation properties of Wood-cement compounds, in 10th Conference on Advanced Building Skins, BernABS, Berne.
WCC-based Load-Bearing Wall Elements
Macchi Niccolò, Zwicky Daia (2015), WCC-based Load-Bearing Wall Elements, in 10th Conference on Advanced Building Skins, BernABS, Berne.
Wood-lightweight concrete - Development of energy and resource resource-efficient construction materials
Fadai Alireza, Winter Wolfgang (2015), Wood-lightweight concrete - Development of energy and resource resource-efficient construction materials, in IABSE Conference "Structural Engineering: Providing Solutions to Global Challenges", GenevaIABSE, Zurich.
Application of Lightweight Wood-Concrete as Construction Material
Fadai Alireza, Fuchs Michael, Winter Wolfgang (2014), Application of Lightweight Wood-Concrete as Construction Material, in hybrid2014 by iabse.ch "Exploring the Potential of Hybrid Structures for Sustainable Construction", Fribourg CHHEIA, Fribourg.
Fire Risk Evaluation Methods for Wood-Based Construction in Urban Context
Fadai Alireza, Kist M., Winter Wolfgang (2014), Fire Risk Evaluation Methods for Wood-Based Construction in Urban Context, in World Conference on Timber Engineering, Quebec City, KanadaWCTE, Quebec.
Hybrid Structural Elements made of Timber and Wood-based Concrete
Macchi Niccolò, Zwicky Daia (2014), Hybrid Structural Elements made of Timber and Wood-based Concrete, in hybrid2014 by iabse.ch: Exploring the Potential of Hybrid Structures for Sustainable Construction, Fribourg, CHHEIA, Fribourg.
Ressourceneffiziente Konstruktionen in Holzleichtbeton-Verbundbauweise
Fadai Alireza, Winter Wolfgang (2014), Ressourceneffiziente Konstruktionen in Holzleichtbeton-Verbundbauweise, in Bautechnik,, 91(10), 753-763.
Use of wood waste as a resource for structural wood-concrete compounds
Macchi Niccolò, Zwicky Daia (2014), Use of wood waste as a resource for structural wood-concrete compounds, in Performance and maintenance of bio-based building materials influencing the life cycle and LCA, Kranjska Gora, SloveniaCOST, Kranjska Gora.
Wood-based Concrete – A Promising Material for Hybrid Construction of Buildings
Macchi Niccolò, Zwicky Daia (2014), Wood-based Concrete – A Promising Material for Hybrid Construction of Buildings, in hybrid2014 by iabse.ch: Exploring the Potential of Hybrid Structures for Sustainable Construction, Fribourg, CHHEIA, Fribourg.
Wood-based Concrete for Composite Building Construction with Timber
Macchi Niccolò, Zwicky Daia (2014), Wood-based Concrete for Composite Building Construction with Timber, in Concrete Innovation Conference CIC2014, Oslo, NorwayCIC, Oslo.
Wood-based construction - sustainable use of light-weight wood-concrete
Fadai Alireza, Fuchs Michael, Winter Wolfgang (2014), Wood-based construction - sustainable use of light-weight wood-concrete, in hybrid2014 by iabse.ch "Exploring the Potential of Hybrid Structures for Sustainable Construction, Firbourg, CHHEIA, Fribourg.
Wood-Based Construction for Multi-story Buildings: Application of Cement Bonded Wood Composites as Structural Element
Fadai Alireza, Fuchs Michael, Winter Wolfgang (2014), Wood-Based Construction for Multi-story Buildings: Application of Cement Bonded Wood Composites as Structural Element, in Aicher Simon (ed.), Springer, Netherlands, 471-484.
Wood-Based Construction in Urban Context - Optimization Concepts for Increased Resource Efficiency
Fadai Alireza, Winter Wolfgang (2014), Wood-Based Construction in Urban Context - Optimization Concepts for Increased Resource Efficiency, in World Conference on Timber Engineering, Quebec City, CANWCTE, Quebec.
Optimization of wood based structural elements - Concepts for increased resource efficiency
Fadai Alireza, Winter Wolfgang (2013), Optimization of wood based structural elements - Concepts for increased resource efficiency, in Sustainable Building Conference 2013, Graz, AustriaSBC, Graz.
Wood-based construction in urban context concepts for increased ressource efficiency
Fadai Alireza, Tavoussi Tafreshi K., Winter Wolfgang (2013), Wood-based construction in urban context concepts for increased ressource efficiency, in DREVOSTAVBY 2013, Volyne, Tschechien ??, Prag.

Collaboration

Group / person Country
Types of collaboration
Charpentes VIAL SA Switzerland (Europe)
- Industry/business/other use-inspired collaboration
TU Vienna / ITI Austria (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
ERNE Holzbau AG Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Industry/business/other use-inspired collaboration

Scientific events

Active participation

Title Type of contribution Title of article or contribution Date Place Persons involved
Students’ day enigma/smw (Associations of material sciences students ETHZ and EPFL) Individual talk Light-weight wood-based concrete in composite action with timber – latest BFF ? 12.04.2017 Smart Living Lab, Fribourg, Switzerland Zwicky Daia;
IKI-Seminar Individual talk Holzleichtbeton im Verbund mit Holz – ziemlich beste Freunde 01.02.2016 Universität der Bundeswehr, Neubiberg, Germany Zwicky Daia;
NRP66 3rd Scientific Progress Report meetings Poster WooCon Project 16.04.2015 Thun, Switzerland Macchi Niccoló; Zwicky Daia;
Visite rectrice HES-SO Talk given at a conference Projet WooCon 09.10.2014 HEIA Fribourg, Switzerland Zwicky Daia; Boissonnade Nicolas;
NRP66 2nd Scientific Progress Report meetings Talk given at a conference WooCon Project 11.04.2014 Murten, Switzerland Zwicky Daia;
Mid-term meeting consortium Individual talk WooCon 25.11.2013 Vienna, Austria Fridez Anthony; Zwicky Daia; Macchi Niccoló;
NRP66 1st Scientific Progress Report meetings Talk given at a conference WooCon Project 19.04.2013 Magglingen, Switzerland Zwicky Daia;
Site visit steering committee Individual talk Wood-based concrete – building construction with composite elements of wood-concrete compounds and timber 12.11.2012 Fribourg, Switzerland Zwicky Daia;
NRP66 kick-off meeting, 30.03.2012 Talk given at a conference WooCon Project 01.09.2012 Sursee, Switzerland Zwicky Daia;


Self-organised

Title Date Place
International Workshop hybrid2014 by iabse.ch: Exploring the Potential of Hybrid Structures for Sustainable Construction 22.06.2014 Frobourg, Switzerland
Consortium meeting 26.03.2013 Fribourg, Switzerland
Consortium meeting 23.10.2012 Neuenburg, Switzerland

Knowledge transfer events



Self-organised

Title Date Place
Minisymposium 'Multi-Functional Performance of Cement-Bound Wood Products' @ WCTE2016 22.08.2016 Vienna, Austria
Minisymposium 'Wood-Cement Compounds for Building Skins – Structural, Building-Physical and Sustainability Performance' @ Advanced Building Skins 03.11.2015 Berne, Switzerland
Finissage travelling exhibition NRP66 18.11.2014 College of Engineering and Architecture, Fribourg, Switzerland

Communication with the public

Communication Title Media Place Year
New media (web, blogs, podcasts, news feeds etc.) Beton aus Holz Materialsgate – Information & Innovation International 2017
Media relations: radio, television Beton aus Holzresten SRF Tagesschau Spätausgabe Wochenende German-speaking Switzerland 2017
Media relations: radio, television Construction: à base de sciure, le béton fait sa révolution RTS téléjournal 19h30 Western Switzerland 2017
Media relations: radio, television Schweizer Forscher entwickeln Holzbeton Deutschlandfunk - Forschung aktuell International 2017
Print (books, brochures, leaflets) Quand les bâtiments défient les lois de la nature (hémisphères) Western Switzerland 2014
Media relations: print media, online media Baut mit Holz! 20 Minuten German-speaking Switzerland 2013
Media relations: print media, online media Nouvelle recherche – le béton de bois Reflex (Magazine EPFL) Western Switzerland 2013

Awards

Title Year
SNF International Short Visit Grant für F&E sabbatical am Imperial College, London (März - Juni 2015) 2015

Associated projects

Number Title Start Funding scheme
160622 Structural behaviour of elements made of timber and wood-based concrete in composite action 01.03.2015 International short research visits

Abstract

The proposed project aims at developing a multi-layer wall and floor system composed of lightweight wood-concrete and timber sections in composite action for application in structural building components.The project requires investigations on the composition of wood-concrete compounds, on the interfaces, the compatibility, and the composite action between the different components and materials of the multi-layer system, and on manufacturing methods, in order to optimize a composite system by using the best characteristics of each material and component. For the construction technology to be acceptable in future practical application, engineering know-how (i.e. structural behaviour and appropriate design approaches and values, structural reliability) is to be amended and verified by scientifically robust background data; the economic and ecological competitiveness of the primarily wood-based multi-layer structural elements is analysed as well. The outcome of the project has to be communicated to the target audience in order to create attention for possibly future applications of the new construction technology. The results of the proposed research should primarily prove the practical applicability of the new structural elements, i.e. proof of readiness for first use of a new construction technology:- Composition recipes for wood-concrete compounds as structural material are developed, of which the mechanical short- and long-term properties, workability characteristic and appropriate pre-treatment methods for the wood particles have been preliminarily investigated.- Structural composite elements, made of wood-concrete compound layers and beam- or slab-type timber components, are conceptually designed for floors and walls and their structural performance is analysed theoretically and experimentally in limited test series.- Basic proposals for structural design approaches, structural modelling and structural details of the new building construction technology are developed and experimentally verified. - First appraisals of the new multi-layer composite elements with regard to building physics, fire safety, as well as economic and ecological feasibility are available.The proposed technology combines concrete construction tradition with organic renewable resources as an alternative to conventional concrete or masonry, also opening opportunities to reduce carbon emissions through the increased use of wood for construction (since the carbon dioxide stocked in the wood is preserved for several decades instead of burning it). This opens new application fields for a smarter wood-based construction, with an increased volume and use of locally available wood from renewable resources, allowing for substitution of more traditional construction materials by a more ecological, economic and sustainable building technology.
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