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.
|First name||Last name||Country||Affiliation|
|Frank||Dehn||Germany||KIT Karlsruher Institut für Technologie|
|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|
|Hans-Dieter||Beushausen||South Africa||University of Cape Town|
|Harald||Müller||Germany||SMP Ingenieure im Bauwesen GmbH|
|Geert||de Schutter||Belgium||Ghent University|
|Ludger||Lohaus||Germany||Leibniz Universität Hannover|
|Jean Michel||Torrenti||France||Univ Gustave Eiffel|
|Nikola||Tošić||Spain||Universitat Politècnica de Catalunya|
|Martin||Cyr||France||Université de Toulouse|
|Michael||Haist||Germany||Leibniz Universität Hannover|
|Eduardo||Julio||Portugal||Instituto Superior Tecnico, Universidade de Lisboa|
|Liberato||Ferrara||Italy||Politecnico di Milano|
|Jaime||Gálvez Ruiz||Spain||Universidad Politecnica de Madrid|
- TG4.0 - Code-type Concrete Models
- TG4.1 - Fibre-reinforced concrete
- TG4.3 - Structural design with flowable concrete
- TG4.4 - Restoration of heritage in exposed concrete
- TG4.5 - Time-dependent Behavior of Concrete
- TG4.7 - Structural Applications of Recycled Aggregate Concrete – Properties, Modeling, and Design
- TG4.8 - Low-carbon concrete structures
TG4.0 - Code-type Concrete Models
The first target of TG4.0 consists in developing an updated code-type presentation of the constitutive and durability related behaviour of structural concrete for inclusion in MC2020. The basis and point of origin of the AG’s/TG’s work is formed by the existing chapter 5.1 “Concrete” in MC2010. The work of TG4.0 comprises firstly a critical review and an updating of the existing models, further the implementation of new available concrete models, taking into consideration the increase of knowledge by research within the last decade. Major criteria for models being suited are their physical and thermo-dynamical soundness and accuracy as well as practical characteristics like simplicity and operationality. Further, emphasis is placed on concise explanatory notes and well-selected references which will be given as commentary (left-hand column) to the code text.
The second target of TG4.0 consists in preparing a background document (Bulletin) on the concrete models included in the chapter “Concretes” of MC2020. This document will give detailed background information together with the results of analyses and evaluations. Thus, the bulletin will represent a comprehensive summary of the relevant knowledge available to the members of the Task Group 4.0 at the time of its drafting. Moreover, the new bulletin will provide an essential basis for the development of future generations of code-type models related to the characteristics and the behaviour of structural concrete. Further it will offer insights into the complexity of the normative work related to code-type concrete modelling, leading to a better understanding and adequate appreciation of MC2020.
This new Bulletin will be an update of the Bulletin 70 “Code-type models for concrete behaviour – Background of MC2010”, which has been released parallel to MC2010 in 2013.
First name Last name Country Affiliation Harald Müller Germany SMP Ingenieure im Bauwesen GmbH David Fernández-Ordóñez Switzerland fib Carmen Andrade Spain Centre Internacional de Mètodes Numèrics en l’Ènginyeria (CIMNE) Mouna BOUMAAZA France Vinci Construction Manfred Curbach Germany Technische Univ. Dresden Avraham Dancygier Israel Technion-Israel Institute of Technology Frank Dehn Germany KIT Karlsruher Institut für Technologie Vyatcheslav Falikman Russian Federation Russian Structural Concrete Association Christoph Gehlen Germany TUM School of Engineering and Design Michael Haist Germany Leibniz Universität Hannover Petr Hajek Czech Republic Czech Technical University in Prague Terje Kanstad Norway The Norwegian Univ.of Science & Tech Sylvia Kessler Germany Helmut-Schmidt-University/ University of the Federal Armed Forces Hamburg Lionel Linger France Vinci Construction Grand Projets Ludger Lohaus Germany Leibniz Universität Hannover Viktor Mechtcherine Germany Technical Univ. Dresden Nadja Oneschkow Germany Leibniz University Hannover Takumi Shimomura Japan Nagaoka Univ. of Technology Darko Tasevski Switzerland Emch+Berger AG Bern Jean Michel Torrenti France Univ Gustave Eiffel Nikola Tošić Spain Universitat Politècnica de Catalunya Amir Rahimi Germany Bundesanstalt für Wasserbau Hans-Wolf Reinhardt Germany Universität Stuttgart Michael Vogel Germany Karlsruher Institut für Technologie (KIT) - Universität (Campus Süd) Tamon Ueda China Shenzhen University Joost Walraven Netherlands Delft University of Technology Roman Wan-Wendner Belgium Ghent University Peng Zhang China Qingdao University of Technology Ulrich Häussler-Combe Germany Consultant Vladislav Kvitsel Germany Karlsruhe Institute of Technology Kerstin Speck Germany Technische Universität Dresden Fernando Acosta Germany Züblin AG
TG4.1 - Fibre-reinforced concrete
Model Code 2020 has completed the draft related to the homogenization of FRC to RC and PC design rules,starting from the principles introduced for the first time in Model Code 2010.
Even if the proposed equations are now better harmonized with those controlling the behaviour of the common concrete structures, many aspects, remained out of the code.
These aspects have been already investigated mainly in relation to steel fibres, but we need to extend them to any type of fibres and to hybrid concretes. Moreover, the market has been strongly oriented to sustainability and to the introduction of new matrixes to reduce CO2 emissions and therefore we have to understand which effectiveness can be guaranteed with the adoption of these eco-mixes.
After the publication of the Bulletin 105, we need a special bulletin able to propose other examples of real applications, aimed at checking the effectiveness of the equations introduced and the advantages correlated to sustainability. These examples should be also analysed in other Commissions like the number 1, 3 and 7. When a good proposal concerning the indicated aspects will be achieved, the suggestion is to introduce it, updating the actual draft of Model Code, without waiting for the next edition. To this aim a special role should be played by databases: the database already started by Albert De La Fuente has to be developed, because it could help the evolution of future proposals, making them much more reliable. It has to be enlarged to UHPC where a special need of data is required.
First name Last name Country Affiliation Gerhard Vitt Germany Bekaert GmbH 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 - Wolfgang Kusterle Germany OTH Regensburg Horst Falkner Germany Retired Nemkumar Banthia Canada Univ. of British Columbia Tim Soetens Belgium Sanacon Bryan Barragan France OCV Chambery International Billy Boshoff South Africa University of Pretoria Terje Kanstad Norway The Norwegian Univ.of Science & Tech Bruno Massicotte Canada Ecole Polytechnique de Montréal Fausto Minelli Italy University of Brescia Sandro Moro Italy BASF Pedro Serna Ros Spain Univ. Politecnica de Valencia-Icitech ab van den bos Netherlands NLyse Elena Vidal Sarmiento Spain Bekaert Xavier Destrée Belgium ArcelorMittal François Duplan France - Cristina Frazao Portugal - Jaime Gálvez Ruiz Spain Universidad Politecnica de Madrid
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.
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 TU München Steffen Grünewald Netherlands Ghent University 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 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 - Restoration of heritage in exposed concrete
Since existing exposed concrete structures are in direct contact with the environment, they are prone to experience degradation faster, and since appearance is a main key-issue, maintenance of this type of structures needs to be properly addressed. In addition, many of these structures have a unique cultural (historical, architectural, technical, other) value, being therefore classified as heritage. For this reason, the repair techniques adopted for current concrete structures may not be adequate in some situations and restoration methods should be adopted instead.
The main goal of fib TG 4.4. is to publish a ‘Guide on Conservation and Restoration of Surfaces of the Built Heritage in Exposed Concrete’, including recommendations and guidelines, as well as successful examples that can be assumed as reference case studies. Experts from the academia, designers, consultants, contractors, and other professionals working in restoration of exposed concrete surfaces are welcome to join TG4.4 as active members.
First name Last name Country Affiliation David Fernández-Ordóñez Switzerland fib Eduardo Julio Portugal Instituto Superior Tecnico, Universidade de Lisboa Jónatas Valenca Portugal Universidade de Lisboa Hugo Sérgio Sousa Costa Portugal ISEC - Institute of Engineering of Polytechnic Institute of Coimbra Robert Armbruster United States The Armbruster Company, Inc. Elisa Franzoni Italy University of Bologna Elisabeth Marie-victoire France Laboratoire de Recherche des Monuments Historiques Myriam Bouichou France Laboratoire de Recherche des Monuments Historiques Teresa Cunha - Ferreira Portugal University of Porto Xavier Hallopeau France SECCO Corrosion Consulting Elsa Eustáquio Portugal Laboratório Nacional de Engenharia Civil Véronique Bouteiller France IFSTTAR Helena Silva Portugal Laboratório Nacional de Engenharia Civil, LNEC Carmen Andrade Spain Centre Internacional de Mètodes Numèrics en l’Ènginyeria (CIMNE) Claudia Devaux France dda devaux & devaux architects Ana Tostões Portugal Universidade de Lisboa
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;
First name Last name Country Affiliation Guang Ye Netherlands Delft University of Technology Michael Haist Germany Leibniz Universität Hannover David Fernández-Ordóñez Switzerland fib Roman Wan-Wendner Belgium Ghent University Dara McDonnell Australia Arup Harald Müller Germany SMP Ingenieure im Bauwesen GmbH Jan Vítek Czech Republic Metrostav a. s. Jean Michel Torrenti France Univ Gustave Eiffel Takumi Shimomura Japan Nagaoka Univ. of Technology Darko Tasevski Switzerland Emch+Berger AG Bern Alejandro Pérez Caldentey Spain Universidad Politécnica de Madrid Nikola Tošić Spain Universitat Politècnica de Catalunya Jan Cervenka Czech Republic Cervenka Consulting Ltd Ravi Patel Germany Institute of Building materials (IMB) Nadja Oneschkow Germany Leibniz University Hannover Eamon Stack Ireland Banagher Precast Peter Takacs United Kingdom aecom Giovanni Di Luzio Italy Politecnico di Milano Farid Benboudjema France ENS Paris-Saclay, Université Paris-Saclay Richard Caron Germany KIT Anja Klausen Norway NTNU Antonia Menga Norway NTNU Mohammad Najeeb Shariff India Indian Institute of Technology Bombay Dirk Schlicke Austria Technische Universität Graz Thierry Vidal France LMDC (Laboratoire Matériaux et Durabilité des Constructions)
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
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 Harald Müller Germany SMP Ingenieure im Bauwesen GmbH Takafumi Noguchi Japan University of Tokyo Frank Dehn Germany KIT Karlsruher Institut für Technologie João Nuno Pacheco Portugal CERIS/c5Lab Sustainable Construction Materials Association Hans-Dieter Beushausen South Africa University of Cape Town Roman Wan-Wendner Belgium Ghent University Ivan Ignjatović Serbia University of Belgrade Albert De la Fuente Spain Universitat Politècnica de Catalunya Marija Nedeljković Netherlands TU Delft Yahya Kurama France Univ. of Notre Dame Jiabin Li Belgium KU Leuven Amor Ben Fraj France CEREMA George Wardeh France Un. de Cergy-Pontoise Flavio Stochino Italy Università di Cagliari Miren Etxeberria Spain UPC Edu Sindy Seara-Paz Spain Universidade a Coruña Mirian Velay-Lizancos United States Purdue University Romildo Toledo Filho Brazil Federal University of Rio de Janeiro Liberato Ferrara Italy Politecnico di Milano Samer Al-Martini United Arab Emirates Abu Dhabi University Elhem Ghorbel France CY Cergy Paris university Belén Gonzalez-Fonteboa Spain Universidade de Coruña Enzo Martinelli Italy University of Salerno Marco Pepe Italy University of Salerno Jan Podroužek Czech Republic Brno University of Technology Reem Sabouni United Arab Emirates Abu Dhabi University Snežana Marinković Serbia University of Belgrade Ali Abbas United Kingdom University of East London Fabienne Robert France CERIB Sivakumar Kandasami India L&T Construction Boksun Kim United Kingdom University of Plymouth Dan V. Bompa United Kingdom University of Surrey Shahria Alam Canada University of British Columbia Bohuslav Slánský Czech Republic Skanska Pawel Sikora Poland West Pomeranian University of Technology in Szczecin Sandrine Braymand France University of Strasbourg Jean Michel Mechling France Université de Lorraine Zengfeng Zhao China Tongji University Débora Martinello Carlesso Spain - Irene Josa United Kingdom University College London (UCL) Dora Foti Italy Politecnico di Bari Arthur Slobbe Netherlands TNO Juan Garzón Netherlands TNO Khaled Hassan Qatar IRD (Infrastructure Research & Development) Cristiano Coviello Italy - Lucas Menegatti Brazil UFRJ Ana Sofia Louro Portugal LNEC Kaihua Liu China - Marco Davolio Italy Politecnico di Milano Jean Ayodélé Adessina France Cerema Sourav Chakraborty India Indian Institute of Technology Hyderabad KVL Subramaniam India Indian Institute of Technology Hyderabad Ruben Paul Borg Malta University of Malta Annkathrin Sinning Germany - Josef Hegger Germany RWTH Aachen Martin Classen Germany RWTH Aachen University Thorsten Stengel Germany - Peter Wild Germany Munich University of applied sciences Andrea Kustermann Germany Munich University of applied sciences Jairo Andrade Brazil Graduate Program in Materials and Engenheering Technology Wengui Li Australia - Dario Coronelli Italy Politecnico di Milano Ricardo Carrazedo Brazil Universidade São Paulo
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.
First name Last name Country Affiliation Martin Cyr France Université de Toulouse David Fernández-Ordóñez Switzerland fib Michael Haist Germany Leibniz Universität Hannover Jean Michel Torrenti France Univ Gustave Eiffel Taku Matsuda Japan SUMITOMO MITSUI CONSTRUCTION CO., LTD Zoi Ralli Canada Lassonde School of Engineering Zengfeng Zhao China Tongji University Ali Abbas United Kingdom University of East London Hasanain Al-Naimi United Kingdom University of East London Shashank Bishnoi India Indian Institute of Technology Delhi Mouna BOUMAAZA France Vinci Construction Guillaume Habert Switzerland ETH Zurich Tor Martius-Hammer Norway SINTEF AS Rachida Idir France Cerema Fragkoulis Kanavaris United Kingdom Arup Tim Lohmann United Kingdom Wentworth House Partnership Takafumi Noguchi Japan University of Tokyo Arezki Tagnit Hamou Canada Sherbrooke University Stefanie Von Greve-Dierfeld Switzerland TFB Technology and Research for Concrete Structures Brant Walkley United Kingdom University of Sheffield Roman Wan-Wendner Belgium Ghent University Eduardo Julio Portugal Instituto Superior Tecnico, Universidade de Lisboa Hugo Sérgio Sousa Costa Portugal ISEC - Institute of Engineering of Polytechnic Institute of Coimbra Ricardo Nuno Francisco do Carmo Portugal ISEC - Coimbra Institute of Engineering Jean-Philippe Vacher France MG Group Hisham Hafez United Kingdom University of Leeds Jörg Unger Germany Bundesanstalt für Materialforschung und -prüfung, BAM Karen Scrivener Switzerland EPFL Sylvia Kessler Germany Helmut-Schmidt-University/ University of the Federal Armed Forces Hamburg VANDERLEY JOHN Brazil Polytechnic School