• COM4: Concrete & concrete

    COM4: Concrete & concrete technology

  • COM4: Concrete & concrete

    COM4: Concrete & concrete technology

Motivation

The overall motivation of fib Commission 4 (COM4) is to make theoretical and practical developments in the field of concrete and concrete technology, and to present these developments in an understandable and code-type formulated manner. COM4 positions itself at the forefront of new technologies and techniques by considering both fundamental research and practical issues.

Scope and objective of technical work

The aim of COM4 is to collect and to validate information on the properties and behaviour of concrete for structural applications subjected to various types of loading and environmental conditions. The commission focuses its attention both on traditional types of concrete, in particular under unusual conditions, and on new types of concrete and cementitious composites under all types of loading and condition. The properties of the concrete types considered should be formulated in such a way that it is possible to derive behavioural models and design recommendations for practical applications.

 

tbdCommission Chair
Jean Michel Torrenti
Tor Arne Martius HammerDeputy Chair
Tor Arne Martius-Hammer

First name Last name Country Affiliation
Frank Dehn Germany KIT Karlsruher Institut für Technologie
Liberato Ferrara Italy Politecnico di Milano
Harald Justnes Norway SINTEF Building and Infrastructure
Steinar Helland Norway S Helland Konsult
Joost Walraven Netherlands Delft University of Technology
Mette Geiker Norway NTNU - Trondheim Norwegian Univ.
Viktor Mechtcherine Germany Technical Univ. Dresden
David Fernández-Ordóñez Switzerland fib
Hans-Dieter Beushausen South Africa University of Cape Town
Harald Müller Germany SMP Ingenieure im Bauwesen GmbH
Steffen Grünewald Netherlands Sustainable Concrete Centre
Geert de Schutter Belgium Ghent University
Tamon Ueda China Shenzhen University
Ludger Lohaus Germany Leibniz Universität Hannover
Lucie Vandewalle Belgium KULeuven
Tor Martius-Hammer Norway SINTEF AS
Jean Michel Torrenti France Univ Gustave Eiffel
Roman Wan-Wendner Belgium Ghent University
Michael Haist Germany Leibniz Universität Hannover(KIT)
Nikola Tošić Spain Universitat Politècnica de Catalunya
Fragkoulis Kanavaris United Kingdom Arup
Martin Cyr France Université de Toulouse

  • TG4.1 - Fibre-reinforced concrete

    Fibre concrete is more than 50 years old and the design rules have undergone developments over the years. TG4.1 will make theoretical and practical developments in the field of fibre-reinforced concrete materials technology, rheology and materials characterisation and modelling and to present these developments in code-type formulations.

    The task group collects and validates information on the behaviour of fibre-reinforced concrete materials, subjected to various types of loading and environmental conditions.

    TG4.1 is currently finalising a bulletin on the background to the design rules in MC2010.


    Lucie VandewalleConvener
    Lucie Vandewalle

    First name Last name Country Affiliation
    Lucie Vandewalle Belgium KULeuven
    David Fernández-Ordóñez Switzerland fib
    Frank Dehn Germany KIT Karlsruher Institut für Technologie
    Pierre Rossi France IFSTTAR
    Ravindra Gettu India Indian Institute of Technology Madras
    Barzin Mobasher United States Arizona State University
    Giovanni Plizzari Italy University of Brescia
    Joaquim A. O. Barros Portugal Universidade do Minho
    György L. Balázs Hungary Budapest Univ. of Techn. & Economics
    Marco di Prisco Italy Politecnico di Milano
    Avraham Dancygier Israel Technion-Israel Institute of Technology
    Gustavo Parra-Montesinos United States University of Michigan
    Ingemar Löfgren United Kingdom -
    Xavier Destree Belgium -
    Wolfgang Kusterle Germany OTH Regensburg
    Horst Falkner Germany Retired
    Nemkumar Banthia Canada Univ. of British Columbia
    Tim Soetens Belgium Sanacon
    Ulvis Skadiņš Latvia -
    Pavel Shandaliy Russian Federation MC-Bauchemie Russia
    Sherif Yehia United Arab Emirates -
    Peng Gao China Hefei University of Technology
    Dara McDonnell Australia Arup
    Klaus-Alexander Rieder United States GCP Applied Technologies Inc.

  • TG4.2 - Ultra high-performance fibre-reinforced concrete

    Task Group 4.2 (TG4.2) will make theoretical and practical developments for concretes with strength > 120 N/mm2 in the field of fibre-reinforced concrete materials technology, rheology and materials characterisation and modelling to present these developments in code-type formulations. Work is applicable to concrete with fibres of various types, such as steel, polymeric or combinations thereof.

    The work of TG4.2 is coordinated with the work of fib TG4.1 (Fibre-reinforced concrete) that develops recommendations for conventional fibre-reinforced concrete.


    Joost WalravenConvener
    Joost Walraven

    First name Last name Country Affiliation
    Frank Dehn Germany KIT Karlsruher Institut für Technologie
    Pietro Gambarova Italy Politecnico di Milano
    Mouloud Behloul France Lafarge
    Stefan Greiner Germany Bilfinger + Berger AG
    Alain Simon France Eiffage TP
    Kai Bunje Germany IBB Fehling & Jungmann GmbH
    Thierry Thibaux France Eiffage
    Makoto Katagiri Japan Taiheiyo Cement Corporation
    Jacques Resplendino France Setec TPI
    Marijan Skazlic Croatia University of Zagreb
    Torsten Leutbecher Germany Universität Siegen
    Berndt Aarup Denmark CRC Technology ApS
    Benjamin Graybeal United States PSI/FHWA Structures
    Pierre Marchand France IFSTTAR
    Björn Frettlöhr Germany -
    Joost Walraven Netherlands Delft University of Technology
    Ekkehard Fehling Germany IBB Fehling + Jungmann GmbH
    Pierre Rossi France IFSTTAR
    Dario Redaelli Switzerland School of Engineering and Architecture - Fribourg
    David Fernández-Ordóñez Switzerland fib
    Emmanuel Denarie Switzerland EPF Lausanne
    Steffen Grünewald Netherlands Sustainable Concrete Centre
    Nguyen Viet Tue Austria Technische Universität Graz
    Yasuhiko Sato Japan Waseda University
    Karl-Heinz Reineck Germany -
    Michael Schmidt Germany Fehling + Jungmann GmbH
    François Toutlemonde France IFSTTAR
    Marco di Prisco Italy Politecnico di Milano

  • TG4.3 - Structural design with flowable concrete

    Flowable concrete (highly flowable, self-compacting and/or self-levelling) has evolved from a special type to a commonly applied building material. fib Task Group 4.3 (TG4.3) considers three aspects of flowable concrete (FC) for structural design: material properties, production effects and structural boundary conditions. The flow of concrete (initiated by some vibration and/or the weight of concrete) can affect the structural characteristics of hardening or hardened concrete. The mixture composition has to be adjusted and optimised in order to obtain a high flowability. TG4.3 aims at promoting the application of flowable concrete, improving and adapting the concrete design and the production technology and its implementation in guidelines and codes.


    Steffen GrünewaldConvener
    Steffen Grünewald
    Liberato FerraraCo-Convener
    Liberato Ferrara

    First name Last name Country Affiliation
    Frank Dehn Germany KIT Karlsruher Institut für Technologie
    Liberato Ferrara Italy Politecnico di Milano
    Mouloud Behloul France Lafarge
    Ravindra Gettu India Indian Institute of Technology Madras
    Bas Obladen Netherlands Strukton Group
    Peter Billberg Sweden Strängbetong
    Laetitia Martinie France INSA
    Nicolas Roussel France IFSTTAR
    Bernhard Freytag Austria Technische Universität Graz
    Mohamed Sonebi Ireland Queen’s University Belfast
    Patrick Stähli Switzerland Concretum Construction Science AG
    Filipe Laranjeira Spain Univ. Politecnica de Catalunya
    Guido Bertram Germany Grawe + Bertram Ingenieure
    Andreas Leemann Switzerland EMPA
    Susan Taylor Ireland Queen's University Belfast
    Sandra Nunes Portugal University of Porto
    On Spangenberg Denmark Technical University of Denmark
    Gregor Fischer Denmark Technical University of Denmark
    Joost Walraven Netherlands Delft University of Technology
    Mette Geiker Norway NTNU - Trondheim Norwegian Univ.
    Terje Kanstad Norway The Norwegian Univ.of Science & Tech
    Henrik Stang Denmark University of Denmark
    Konrad Zilch Germany -
    Steffen Grünewald Netherlands Sustainable Concrete Centre
    Wolfram Schmidt Germany BAM - Bundesanstalt für - Materialforschung und -prüfung
    John Cairns United Kingdom Heriot-Watt University
    David Fernández-Ordóñez Switzerland fib
    Bryan Barragan France OCV Chambery International
    Joop Den Uijl Netherlands -
    Harald Beitzel Germany Inst. für Bauverfahrens- und Umwelttechnik
    Yasuhiko Sato Japan Waseda University
    Lucie Vandewalle Belgium KULeuven
    Joaquim A. O. Barros Portugal Universidade do Minho
    Marco di Prisco Italy Politecnico di Milano
    Tor Martius-Hammer Norway SINTEF AS

  • TG4.4 - Aesthetics of concrete surfaces

    The notion of exposed concrete is subjective and varies according to the viewer. The motivation of fib Task Group 4.4 (TG4.4) is to show possibilities how to categorise and evaluate visible concrete surfaces and how to point out technical factors of influence.

    TG4.4 will formulate a state-of-the-art technical report on how exposed concrete is defined and built. The final aim is to create a generally accepted recommendation or guidelines for exposed concrete with a homogenous appearance. This generally accepted recommendation or guidelines will be characterised by classifying exposed concrete in different categories. The limit of its objective performance will be considered as well as the consequences on the effort on-site and the planning of structural framework.


    Ludger LohausConvener
    Ludger Lohaus

    First name Last name Country Affiliation
    Frank Dehn Germany KIT Karlsruher Institut für Technologie
    Tone Anita Østnor Norway SINTEF Building and Infrastructure
    Lluis Casals Roige Spain Oficina tecnica d’enginyeria civil
    Klaus-R. Goldammer Germany Deutscher Beton- und Bautechnik-Verein e.V.
    Christoph Motzko Germany TU Darmstadt
    Alexander Reinisch Austria Doka Industrie GmbH
    Erik Boska Germany TU Darmstadt
    Antonia Pacios Alvarez Spain ETS Ingenieros Industriales - UPM
    Klaartje de Weerdt Norway NTNU
    Christian Hofstadler Austria Institut für Baubetrieb und Bauwirtschaft
    Karen Fischer Germany Leibniz Universität Hannover
    Nikki Cauberg Belgium WTCB-CSTC-BBRI
    Elisabeth Hierlein Germany FDB - Fachvereinigung
    Ludger Lohaus Germany Leibniz Universität Hannover
    David Fernández-Ordóñez Switzerland fib
    Bryan Barragan France OCV Chambery International
    Maher Tadros United States University of Nebraska-Lincoln
    Morten Gjerde New Zealand Victoria University of Wellington

  • TG4.5 - Time-dependent Behavior of Concrete

    The primary objective of the task group is to identify limiting aspects during the design of new or assessment of existing structures related to predicting the time-dependent (mechanical) behavior of “new” but also “traditional” concrete types. Based on the identified short-comings the task group will initiate literature reviews, compile/ update consistent databases and update existing model formulations. Where possible the TG will make use of the data already available in the scientific literature. Where this is not the case, the task group will strive to develop research strategies and coordinate research efforts by its members, supported by national or international research funds.

    The task group plans to develop databases and calibrated prediction models for the time-dependent mechanical properties of cast concrete including:

    • Maturity vs. time concepts, applicable to early age and multi-decade predictions
    • Development of compressive and tensile strength as function of maturity/ time;
    • Development of Young’s modulus as function of maturity/ time;
    • Development of fracture energy as function of maturity/ time;
    • Development of creep and shrinkage as function of maturity/ time;
    • Empirical relationship between mechanical properties and compressive strength as function of maturity/ time;
    • Development of stress-strain diagram as function of maturity/ time;
    • Transport of liquids and gases;
    • Guidance for the coupled hygro-thermal chemo-mechanical analysis of concrete with relevance to e.g. mass concrete or certain structural components prone to early-age cracking;
    • Guidance for the time-dependent nonlinear (fracture mechanical) analysis of concrete including advanced constitutive models and strain rate effects;
    • Time-dependent resistance of concrete subject to sustained load
    • Time-dependent resistance of concrete subject to fatigue;


    Roman Wan-WendnerConvener
    Roman Wan-Wendner

    First name Last name Country Affiliation
    Frank Dehn Germany KIT Karlsruher Institut für Technologie
    Robert Coufal Czech Republic TBG METROSTAV s.r.o.
    Annemarie Herrmann Germany -
    Joachim Juhart Austria Graz University of Technology
    Véronique Baroghel-Bouny France -
    Gert König Germany König und Heunisch Planungsgesellschaft
    Frank Altmann Qatar BG&E
    Sonja Fennis Netherlands Rijkswaterstaat Grote Projecten & Onderhoud
    Mark Alexander South Africa University of Cape Town
    Nele De Belie Belgium -
    Franka Tauscher Germany -
    Guang Ye Netherlands Delft University of Technology
    Doug Hooton Canada University of Toronto
    Joost Gulikers Netherlands Rijkswaterstaat Centre for Infrastructure
    Mette Geiker Norway NTNU - Trondheim Norwegian Univ.
    Viktor Mechtcherine Germany Technical Univ. Dresden
    Alfred Strauss Austria Univ. Bodenkultur Vienna
    Roberto Torrent Switzerland Quali- Ti-Mat Sagl
    Steffen Grünewald Netherlands Sustainable Concrete Centre
    Michael Haist Germany Leibniz Universität Hannover(KIT)
    David Fernández-Ordóñez Switzerland fib
    Hans-Dieter Beushausen South Africa University of Cape Town
    Roman Wan-Wendner Belgium Ghent University
    Harald Müller Germany SMP Ingenieure im Bauwesen GmbH
    Geert de Schutter Belgium Ghent University
    Dara McDonnell Australia Arup

  • TG4.6 - Constitutive laws for concretes with supplementary cementitious materials

    The use of Supplementary Cementitious Materials (SCM) as binder in concrete is increasing, mainly driven by the need of the concrete industry to make concrete more environmentally friendly and in particular to meet official requirements for lower CO2 emissions. Here, it is to replace considerable amount of the high emitting Portland cement with low emitting SCM. The fib Model Code for Concrete Structures 2010 (MC2010) covers the use of SCM, but limits the materials and the amount of SCM. The overall motive of fib Task Group 4.6 (TG4.6) is to prepare the basis for an extension of the MC2010 that includes assessment of less known SCM as well as larger replacements.

    TG4.6 aims to prepare a state-of-the-art report addressing the items in chapter 5.1 Materials – Concrete in the MC2010. The constitutive relations can be formulated as in, and assessed in relation to compliance with those given in MC2010.


    Fragoulis KanavarisConvener
    Fragoulis Kanavaris

    First name Last name Country Affiliation
    Frank Dehn Germany KIT Karlsruher Institut für Technologie
    Guang Ye Netherlands Delft University of Technology
    Doug Hooton Canada University of Toronto
    Björn Lagerblad Sweden CBI
    Jeanette Visser Netherlands Strukton Engineering
    Thomas Bier Germany TU Bergakademie Freiberg
    Steinar Helland Norway S Helland Konsult
    Carmen Andrade Spain Centre Internacional de Mètodes Numèrics en l’Ènginyeria (CIMNE)
    Claus Pade Denmark Danish Technological Institute
    Anya Vollpracht Germany Private
    David Fernández-Ordóñez Switzerland fib
    Emmanuel Denarie Switzerland EPF Lausanne
    Geert de Schutter Belgium Ghent University
    Fragkoulis Kanavaris United Kingdom Arup

  • TG4.7 - Structural Applications of Recycled Aggregate Concrete – Properties, Modeling, and Design

    The main objective of the TG is to formulate design recommendations for the structural use of RAC. This will take the form of proposing new or adjusting existing expressions and models for mechanical and structural properties of reinforced and prestressed concrete structures.

    To achieve this goal, the TG will first perform a comprehensive critical review of literature alongside a preparation of databases of experimental results regarding mechanical and structural properties of RAC. Where necessary and possible, identified gaps in existing results will be complemented by new studies of TG members within existing or new research projects. Based on this work, the TG will formulate expressions and models for the following:

    • Physical properties of RAC – density, water absorption, permeability
    • Mechanical properties – compressive strength, tensile strength, modulus of elasticity, stress–strain relationship, fracture energy, shrinkage, creep
    • Durability-related properties – carbonation resistance, chloride ingress, freeze-thaw resistance, chemical attack
    • Structural behavior – flexural strength, shear strength, axial strength, punching strength, seismic resistance, fire resistance, deformation, cracking, bond and anchorage
    • Fire resistance of RAC and RAC structures – resistance under fire and residual resistance after exposure to elevated temperatures of RAC and reinforced and prestressed RAC members


    Nikola TošićConvener
    Nikola Tošić
    Jean-Michel TorrentiCo-Convener
    Jean-Michel Torrenti

    First name Last name Country Affiliation
    Nikola Tošić Spain Universitat Politècnica de Catalunya
    Jean Michel Torrenti France Univ Gustave Eiffel
    David Fernández-Ordóñez Switzerland fib

  • TG4.8 - Low-carbon concrete structures

    Decreasing the environmental impact of concrete structures is an objective put forward by almost all the actors involved in the domain of construction. Although cementitious materials intrinsically involve low embodied energy, their use in large volumes in worldwide construction lead to approximately 8% of global CO2 emissions. Portland cement is the main constituent responsible for the environmental impacts caused by the life cycle of concrete, as it generates on average more than 800 kg CO2/t of clinker.

    The task group will have two main objectives:

    1- Identify the different ways to obtain low-CO2 concretes among the different possible routes:

    • Evaluate which ones are rapidly reachable and how far we are from an universal utilization of these concretes.
    • Define the work to carry out to bring these concrete at an industrial level.
    • Estimate the scientific, technical and economical obstacles and challenges that could retard the implementation and acceptances of such concretes.

    2- Evaluate the consequences of these low-CO2 concretes on the design of concrete structures, in terms of:

    • Durability, for instance the impact of these new concretes on carbonation and chloride ingress, the most widespread problems facing reinforced concrete worldwide.
    • Structural design, with the verification of the applicability of the international codes (Eurocodes…). The part concerning creep and shrinkage will be developed in the new COM4/TG Time dependent behavior of concrete.


    Martin CyrConvener
    Martin Cyr

    First name Last name Country Affiliation
    Martin Cyr France Université de Toulouse
    David Fernández-Ordóñez Switzerland fib

 

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