The International Federation for Structural Concrete

Commission 8
Concrete
Chair: Dehn (MFPA Leipzig, Germany)
Deputy-Chair: Müller (Karlsruhe Inst. of Tech., Germany)
Members: Beushausen (Univ. of Cape Town, South Africa), De Schutter (Ghent Univ., Belgium),
Ferrara (Politecnico di Milano, Italy), Geiker (NTNU, Norway), Glavind (Danish
Technological Institute, Denmark), Grünewald (TU Delft, The Netherlands), Helland (Skanska
Norge AS, Norway), Lohaus (Leibniz Univ. Hannover, Germany), Mechtcherine (Technische
Univ. Dresden, Germany), Silfwerbrand (CBI, Sweden), Ueda (Hokkaido Univ., Japan),
Vandewalle (KU Leuven, Belgium), Walraven (TU Delft, The Netherlands)
Recent Meetings: Cavtat (May 07), Amsterdam (May 08), London (May 09), Washington (May 10)
Recent Bulletins: fib Bulletin 42: Constitutive modelling of high strength / high performance concrete
(State-of-art report prepared by former TG8.2, published 2008)
Names of fib members are given in bold
Scope
Terms of reference
The aim of the Commission is to collect and to validate information on the properties and the
behaviour of the material concrete subjected to various types of loading and environmental conditions.
The Commission focuses its attention both on classical types of concrete, in particular under unusual
conditions, and on new types of concrete under all types of loadings and conditions. 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.
Areas of interest
• durability and corrosion of concrete;
• cements, concrete admixtures and additions;
• constitutive laws for high performance concretes;
• mechanical properties of concrete with recycled components;
• properties and behavioral modeling of ultra-high strength concrete, lightweight concrete, selfcompacting
concrete and fibre-reinforced concrete;
• environmental aspects of concrete;
• aspects of mixing, execution and curing;
• behaviour of concrete under very low and very high temperatures;
• code-type modeling, in particular for the Model Code 2010;
• performance-based specifications for concrete.
These activities need partially to be coordinated among other fib Commissions and international
associations such as RILEM. Possibilities for joint Task Groups will be considered.
Working programme
• Task Groups will concentrate on the topics mentioned in the list above. They are expected to first
write state-of-the-art reports on the topics considered. To this aim they collect and evaluate the
available information and present it in a systematic way. If appropriate, chapters on existing
practical application are added.
• Proposals are made for formulations of the behaviour of concrete which can be used in design
recommendations. These proposals should, if possible, be formulated as extensions of the New
Model Code.
• The Commission follows current developments in the building industry and at the universities and
can decide to take action with regard to:
• defining new areas of study;
• recommending actions to resolve and prevent problems.
WPC8_22Nov12 – updates to fib Directory 2011 1

Task Group
TG 8.3 Fibre reinforced concrete
Convener: Vandewalle (KU Leuven, Belgium)
Secretary: Lambrechts (Bekaert s.a., Belgium)
Members: Balázs (Budapest Univ. of Technology and Economics, Hungary), Banthia (Univ. of British
Columbia, Canada), Barros (Univ. do Minho, Portugal), Criswell (Colorado State Univ., USA),
Dehn (MFPA Leipzig, Germany), Destree (ArcelorMittal, Belgium), Di Prisco (University of
Milano, Italy), Falkner (Ingenieurbüro Dr. Falkner, Germany), Gettu (Indian Institute of
Technology Chennai, India), Kanstad (The Norwegian Univ. of Science & Tech. , Norway),
Krstulovic-Opara (ArupEnergy, Houston, USA), Kusterle (Univ. Innsbruch, Austria),
Löfgren (Arup Materials Consulting, United Kingdom), Lublóy (Budapest Univ. of Tech.,
Hungary), Mari Bernat (Univ. Politécnicade Catalunya, Spain), Massicotte (Univ. of
Montreal, Canada), Ono (Kyoto Univ., Japan), Pfyl (Pfyl Partner AG, Switzerland), Plizzari
(Univ. of Brescia, Italy), Rossi (LCPC, France), Serna Ros (Univ. Politecnica Valencia, Spain),
Silfwerbrand (CBI, Sweden), Stang (Technical University of Denmark, Denmark), Szabo
(Budapest Univ. of Technology and Economics, Hungary), Tatnall (Synthetic Industries Inc.,
USA), Trottier (Dalhousie University, Halifax, Canada), Vitt ( Bekaert GmbH, Germany),
Walraven (Delft Univ. of Technology, The Netherlands)
Corr. Members: Parra-Montesinos (Univ. of Michigan, USA), Mobasher (Arizona State Univ., USA)
Recent Meetings: Leipzig (Nov 06), Atlanta (Apr 07), Paris (Nov 07), Brussels (Feb 08 – together with
T8.6), Valencia (Mar 08), Paris (June 08 - with TG 8.6), Chennai (Sept 08), Budapest
(Mar 09), Brussels (Jul 09), Milan (Oct 09), Guimaraes (Apr 10), Leuven (Jan 11), Milan
(May 11), Oslo (May 12)
Names of fib members are given in bold
Terms of reference
The Task Group collects and validates information on the behaviour of fibre reinforced concrete
subjected to various types of loading and environmental conditions.
Concerning steel fibre reinforced concrete, the group will continue the work of the RILEM technical
committee TC162-TDF Test and Design Methods for Steel Fibre Reinforced Concrete.
TG 8.3 will develop recommendations and identify research needs for all types of fibres. In the fib
Model Code 2010 (extending Model Code 90), the material ‘Fibre Reinforced Concrete’ is included.
Since both strain hardening and strain softening FRC are to be considered TG 8.3 and TG 8.6 have
prepared the relevant texts together. Also an fib bulletin will be written to give more background
information and details.
Task Group
TG 8.6 Ultra high performance fibre reinforced concrete
Convener: Walraven (Delft Univ. of Technology, The Netherlands)
Members: Aarup (CRC Technology, Denmark), Behloul (Lafarge, France), Bunje (Kassel Univ. and
Fehling & Jungmann GmbH, Germany), Dehn (MFPA Leipzig, Germany), Denarié (EPF
Lausanne, Switzerland), Di Prisco (University of Milano, Italy), Fehling (IBB Fehling +
Jungmann GmbH, Germany), Greiner (Bilfinger + Berger AG, Germany), Grünewald (TU Delft,
The Netherlands), Jungwirth (Schmitt Stumpf Frühauf and Partner, Germany), Lagerblad (CBI,
Sweden), Ma (Leipzig Univ., Germany), Muttoni (EPF Lausanne, Switzerland), Redaelli
(Perreten et Milleret, Switzerland), Resplendino (Ministry of Transport, France), Rossi (LCPC,
France), Schmidt (Kassel Univ., Germany), Shionaga (IHI Co. Ltd., Japan), Simon (Eiffage,
France), Skazlic (Univ. of Zagreb, Croatia), Stürwald (Kassel Univ., Germany), Thibaux
(Eiffage, France), Tue (Graz Univ., Austria), Weisse (Ingenieurbaukontor Schreiber & Partner
WPC8_22Nov12 – updates to fib Directory 2011 2

Leipzig GmbH, Germany)
Corr. Members: Braam (Delft Univ., The Netherlands), Brühwiler (EPF Lausanne, Switzerland), Causse
(Vinci, France), Chanvillard (Lafarge, France), Gambarova (Univ. Milano, Italy), Graybeal
(FHWA, USA), Holschemacher (Univ. of Applied Sciences, Leipzig, Germany), Kaptijn
(Ministry of Traffic and Transport, The Netherlands), Katagiri (Taiheyo Cement, Japan),
Lambrechts (Bekaert s.a., Belgium), Leutbecher (Kassel Univ., Germany), Sato (Hokkaido
Univ., Japan), Toutlemonde (LCPC, France), Ulm (Massachusetts Institute of Technology, USA)
Recent Meetings: Milano (May 07), Marseille (Nov. 07), Kassel (Mar. 08), Varenna (Sept. 08), Marseille
(Nov. 09), Paris (May 10), Milan (Oct. 10), Delft (Jan. 11)
Names of fib members are given in bold
Terms of reference
The Task Group will write design recommendations for concretes with a strength > 120 N/mm 2 ,
applicable to concrete with fibres of various nature, such as steel, polyacrylic, polypropylene etc. or
combinations thereof.
The work of Task Group 8.6 will be co-ordinated with the work of fib Task Group 8.3 Fibre
reinforced concrete that develops guidelines for fibre reinforced concrete in strength classes ≤ 120
N/mm 2 . Through common members there is also co-ordination with the work of the RILEM Technical
Committee on High Performance Fibre Reinforced Cementitious Composites (TC HFC).
The format will be as close as possible to the format of the Model Code 2010 for concrete structures
presently under preparation by fib SAG 5 so that both can be used in a complementary way.
Task Group
TG 8.7 Code-type models for concrete behaviour
Convener: Müller (Karlsruhe Institute of Technology, Germany)
Secretary Burkart (Karlsruhe Institute of Technology, Germany)
Members: Cervenka (Cervenka Consulting, Czech Republic), Curbach (Technische Univ. Dresden,
Germany), Dehn (MFPA Leipzig, Germany), Gehlen (Univ. München, Germany), Glavind
(Danish Technological Institute, Denmark), Gylltoft (Chalmers Univ. of Technology, Sweden),
Helland (Skanska Norge AS, Norway), Koenders (Delft Univ. of Technology, The
Netherlands), Mechtcherine (Technische Univ. Dresden, Germany), Reinhardt (Univ.
Stuttgart, Germany), Walraven (Delft Univ. of Technology, The Netherlands)
Recent Meetings: Karlsruhe (May 08), Stuttgart (Nov. 08), Dresden (April 09)
Names of fib members are given in bold
Terms of reference
Similar to the Model Code 90, the fib Model Code 2010 will include a chapter on the constitutive and
durability related behaviour and properties of concrete. For the time being, this chapter in MC 90 deals
primarily with ordinary structural concrete. Due to the great progress in concrete technology in recent
years, new types of concrete are produced more and more in practice. However, there is still a lack in
compiling the gained knowledge and in particular in presenting the behaviour of these concretes in a
code-type manner. In addition, new concrete models have been developed in the recent past which
have to be evaluated critically in view of writing the Model Code 2010.
The major target of the Task Group consists in developing a code-type presentation of the
constitutive and durability related behaviour of concrete to be included in the new model code. This
target comprises the compilation and evaluation of available concrete models and the development of
new models complying with the framework of the fib Model Code 2010. The obtained results will be
presented in a Bulletin and will directly contribute to the work of fib SAG 5.
WPC8_22Nov12 – updates to fib Directory 2011 3

Task Group
TG 8.8 Structural design with flowable concrete
Conveners: Grünewald (TU Delft, The Netherlands), Ferrara (Politecnico di Milano, Italy)
Members:
(tentative)
Barragan (BASF, Italy), Barros (Univ. of Minho, Portugal), Behloul (Lafarge, France), Beitzel
(IBU Trier, Germany), Billberg (CBI Stockholm, Sweden), Dehn (MPFA Leipzig, Germany),
Den Uijl (TU Delft, The Netherlands), Di Prisco (Politecnico di Milano, Italy), Domone
(Univ. College London, UK), Freytag (TU Graz, Austria), Geiker (DTU Lyngby, Denmark),
Gettu (Indian Institute of Technology Madras, India), Hammer (Sintef, Norway), Kanstad
(NTNU, Norway), Laranjeira (UP Catalunya, Spain), Martinie (LCPC, France), Obladen
(Strukton, The Netherlands), Roussel (LCPC, France), Sato (Hakkaido Univ., Japan), Schmidt
(BAM, Germany), Sonebi (Queen's Univ. Belfast, UK), Stähli (Concretum Zürich, Switzerland),
Stang (DTU Lyngby, Denmark), Vandewalle (Katholieke Universiteit Leuven, Belgium),
Walraven (TU Delft, The Netherlands), Zilch (Techn. Univ. München, Germany)
Recent Meetings: Ghent (April 09), Milan (Jan. 10), Montreal (Sept. 10)
Names of fib members are given in bold
Terms of reference
Scope
Flowable concretes (self-compacting or highly flowable) have evolved to a commonly applied
building material. In spite of significant experience with flowable concrete problems still occur during
casting and the service life of concrete structures. The flow (initiated by vibration and/or the weight of
concrete) can affect the structural behaviour of hardening or hardened concrete. In order to obtain a
high flowability the mixture composition has to be adjusted and optimised. The effect of fibres on the
characteristics of flowable concrete will be considered in a subgroup of fib TG 8.8.
The main objectives of fib Task Group 8.8 are to write a state-of-the-art report and a recommendation
on the structural design with flowable concretes. The performance of a structure with flowable
concrete depends not only on material characteristics, but also on the production method and the
structure itself. Areas of structural design where flowable concretes differ from traditional vibrated
concrete have to be identified. Four aspects will be considered in order to describe structural
behaviour:
- mechanical characteristics
- local effects (i.e. close to the concrete surface or reinforcement bars)
- effects of orientation/segregation due to the flow/vibration
- how to optimise the mixture composition of and production techniques for flowable concrete
Working programme
fib TG 8.8 consists of two subgroups: 'plain concrete' and 'fibre reinforced concrete'; both groups meet
together. The second group will focus on the effect of orientation and distribution of fibres on the
characteristics of flowable concrete, whereas other relevant aspects will be considered by the first
group. The work is divided in three phases: 1) orientation, 2) compilation and comparison (output:
state-of-art report) and 3) translation (output: recommendation).
WPC8_22Nov12 – updates to fib Directory 2011 4

Task Group
TG 8.9 Aesthetics of concrete surfaces
Convener: Lohaus (Leibniz Univ. Hannover, Germany)
Secretary Werner (Leibniz Univ. Hannover, Germany)
Members: Barragan (BASF, Italy), Boska (TU Darmstadt, Germany), Casals (Oficina tècnica d'enginyeria
civil, Spain), Dehn (MFPA Leipzig, Germany), De Weerdt (SINTEF, Norway) Eide (SINTEF,
Norway), Gjerde (Victoria School of Wellington, New Zealand), Goldammer (Deutscher Beton-
und Bautechnik-Verein E.V., Germany), Heck (TU Graz, Austria), Hellström (Swedish Concrete
Association, Sweden), Hierlein (Fachvereinigung Deuscher Betonfertigteilbau e.V. , Germany),
Hofstadler (TU Graz, Austria), Karman (Ecoratio, Netherlands), Motzko (Technische Univ.
Darmstadt, Germany), Pacios (ETS Ingenieros Industriales – UPM, Spain), Reinisch (Doka
GmbH, Austria), Tadros (SPECO Engineering Ltd., Canada), van de Riet (Ecoratio,
Netherlands),
Recent Meetings: Hannover (Dec. 09), Darmstadt (July 10), Darmstadt (Feb 11)
Names of fib members are given in bold
Terms of reference
Scope
The notion of attractive concrete is subjective and varies according to the viewer. In order to have a
basis for the work of TG 8.9, it is necessary to limit the requirements regarding the appearance of
concrete surfaces. Because exposed concrete has been established in recent years by well-known
architects as having a homogenous and smooth appearance, the work will be focused on this kind of
visible concrete surfaces.
An attractive concrete surface is observed within the context of the surfaces of the whole building. The
resulting impression depends considerably on the viewing distance and lighting conditions. Therefore
the utilization of the building is important when evaluating a concrete surface. The realization of an
exposed concrete surface is influenced by many different factors, including concrete technology,
concrete formwork and formwork material, the application of a releasing agent, the method of
operation on-site, logistical conditions during transportation of the concrete and concreting, as well as
climatic influences and the coordination of all persons involved in the building process.
Objectives
TG 8.9 will formulate a state of the art report how exposed concrete is defined and built. The final aim
is to create a generally accepted recommendation or guideline for exposed concrete with a
homogenous appearance. This generally accepted recommendation or guideline will be characterized
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.
Work programme
Phase 1: it will first be necessary to collect and evaluate test results and practical experience with
exposed concrete. The influences on the appearance of a visible surface should be discussed and it
should be assessed in how far they can be controlled in the planning process and during the execution.
The results will have to be summarized in a state of the art report.
Phase 2: Based on the results of phase 1 as well as on already existing national regulations and
recommendations, categories for exposed concrete surfaces will be developed. These categories will
result in a generally accepted recommendation or guideline for exposed concrete with a homogenous
and smooth appearance. The kind of publication of this guideline has to be discussed, possibly as
recommendations for the classification of attractive concrete surfaces.
WPC8_22Nov12 – updates to fib Directory 2011 5

Task Group
TG 8.10 Performance-based specifications for concrete
Conveners: Beushausen (University of Cape Town (UCT), South Africa), Dehn (MFPA Leipzig,
Members
(tentative):
Germany)
Recent Meetings: Leipzig (Jan 11)
Names of fib members are given in bold
Terms of reference
Alexander (Univ. of Cape Town, South Africa), Altmann (TU Dresden, Germany), De Belie
(Univ. of Ghent, Belgium), De Schutter (Univ. of Ghent, Belgium), Fennis (TU Delft, The
Netherlands), Geiker (TU Denmark), Goncalves LNEC, Portugal), Gulikers (RWX, The
Netherlands), Haist (Karlsruhe Institute of Technology, Germany), Hammer (Sintef, Norway),
Hooton (Univ. of Toronto, Canada), König (MFPA Leipzig, Germany), Mechtcherine (TU
Dresden, Germany), Müller (Karlsruhe Institute of Technology, Germany), Strauss (BOKU
Vienna, Austria), Torrent (Holcim, Switzerland), Walraven (TU Delft, The Netherlands),
Wendner (BOKU Vienna, Austria), Ye (TU Delft, The Netherlands),
Scope
Recent advances in cementitious materials technology - as well as the growing use of recycled
materials - have supported the increasing use of modern types of concrete which have been
specifically developed for an application case but which are not covered in existing codes and
specifications.
Traditional descriptive/prescriptive specifications regard concrete as a mix of different ingredients
leading to an apparently identical performance knowing that concrete can vary widely. In contrast,
performance-based specifications set demands on how the concrete will be used rather than on how it
needs to be composed.
Traditional requirements for constituent materials, limiting water/binder ratios and cement contents
are often not applicable for modern construction. With the advancement of testing methods for fresh
and hardened concrete properties, a performance-based design and specification of concrete and
concrete structures is approaching for most applications and already frequently applied. In addition to
compressive strength and durability, other properties (e.g. elastic/plastic deformations, fresh concrete
properties, thermal characteristics during and after hardening, strength development, ductility, crack
resistance, etc.) are relevant and need to be considered.
Also aspects of quality assurance and sustainability must be taken into account.
Objectives
• Provision of concrete technological background and posing of practical questions
• Provision of concrete technological and structural expertise
• Development of (new) design concepts for performance-based concretes/constructions and transfer
of the concepts into practice
Working programme
• A kick-off meeting and a workshop were held in January 2011 (together with RILEM TC 230-PSC:
Performance-based specifications and control of concrete durability, fib Commissions 3 and 5).
• The duration of the TG is set for four years whereby the work will be subdivided into three phases:
- Orientation (definition of achievable short-, medium- and long-term goals)
- Preparation of a state-of-the-art review on performance-based specifications and testing methods
- Preparation of concrete technological and structural design recommendations
Since there is a lack of available knowledge and experience for performance-based design methods for
concrete, TG 8.10 can be a common base for the initiation of national and international collaborations
and research projects leading to pre-normative or even normative specifications (inclusion in
codes/standards).
WPC8_22Nov12 – updates to fib Directory 2011 6

Task Group
TG 8.11 Fire resistant concretes and cementitious
composites for tunnel construction
Conveners: Dehn (MFPA Leipzig GmbH, Germany), Neumann (MFPA Leipzig GmbH, Germany)
Members To be announced
Scope
In research and practice - both in the private and public sector – an important requirement is to have
information about concretes and cementitious composites which show a significant resistance against
extremely high temperatures and temperature gradients as they can occur during tunnel fire scenarios.
Therefore, fib Task Group 8.11 “Fire resistant concretes and cementitious composites for tunnel
construction” intends to prepare a Technical Report that will be a collection of available mix designs
for concretes and cementitious composites in terms of their performances in fire based on
experimental studies and/or real-life experiences. TG 8.11 will intensively cooperate with fib
Commission 1 and fib WG 4.3-5 on “Fire Design of Concrete Tunnels”.
Objectives
• Summary of physical, chemical, thermo-hydraulic/-mechanical and technological background
information for fire resistant concretes and cementitious composites
• Collection of available mix designs for concretes and cementitious composites
Working programme: The planned duration of TG 8.11 is three years.
Task Group
TG 8.12 Constitutive laws for concretes with supplementary
cementitious materials
Conveners: Martius-Hammer (SINTEF, Norway), Justnes (SINTEF, Norway)
Members Brameshuber (RWTH, Germany), Andrade (Instituto Eduardo Torroja, Spain), Bier (TU
Bergakademie Freiberg, Germany), De Schutter (Ghent Univ., Belgium), Dehn (MFPA
Leipzig GmbH, Germany), Denarie (EPF Lausanne, Switzerland), Fidjestol (Elkem ASA ,
Norway), Helland (Skanska Norge AS, Norway), Hooton (Univ. of Toronto, Canada),
Lagerblad (CBI, Sweden), Pade (Danish Technological Institute, Denmark), Visser (TNO
Built Environ. & Geosciences, Netherlands), Vogt (CBI BetongInstitutet, Sweden), Vollpracht
(RWTH, Germany), Ye (Delft Univ. of Technology, Netherlands)
Recent Meetings: Leipzig (Nov 11), Cyprus (March 12)
Names of fib members are given in bold
Terms of reference
Scope
The use of Supplementary Cementitious Materials (SCM) as a binder in concrete is increasing driven
mainly by the concrete industry’s need to make concrete more environmentally friendly and in
particular to meet requirements for lower CO2-emissions. Today’s codes for concrete and concrete
structures allow the use of SCM but limit which materials can be used and the amount of SCM (e.g.
fly ash, silica fume, blast furnace slag, natural pozzolans, fine powders, etc.). TG 8.12 therefore
intends to gather available information about SCM - even for lesser known types - and prepare the
basis for an extension of fib MC 2010, including the assessment of SCM to verify, validate and extend
the constitutive laws/models when SCM are used. The work will also provide input to fib SAG8
“Sustainability”.
WPC8_22Nov12 – updates to fib Directory 2011 7

Terms of reference
The target duration is 4 years, with two meetings per year. The members will be recruited from both
academia and industry; furthermore the TG will cooperate with the new RILEM committee “TC SCM
Hydration and microstructure of concrete with supplementary cementitious materials” and fib TG 8.10
“Performance based specifications”. The work will include review of literature and ongoing research
in the field, codes and recommendations, as well as already-existing constitutive relations and models.
Objectives
The group aims to draft a state-of-the-art report addressing the items in chapters 5.1 (“Materials -
Concrete”) and 7.8 (“Design -Verification of limit states associated with durability) of MC2010. The
constitutive relations can be formulated as in, and assessed in relation to compliance with those given
in MC2010.
The subchapters may contain assessment of the validity of material laws in the two above mentioned
chapters in MC2010 are valid for SCM, based on existing knowledge. If not valid, modifications may
be suggested based on an overview of work to develop or modify material laws for SMC. This may
lead to the results: 1) MC2010 models are valid, 2) other existing laws specially made for SMC are
valid, 3) material laws need to be further investigated or developed.
Working Programme
• Start-up meeting in October 2011
• Joint RILEM TG SCM-meeting.
• Second meeting organised as an internal workshop to plan the further work in the TG; also to
prepare list of STAR-content including authors.
• Biannual meetings to present and discuss new knowledge as prepared in draft chapters.
• Intermediate reporting in Structural Concrete and/or other journals/conferences.
• Final publication as an fib bulletin, state-of-the-art report and other journals/conferences
WPC8_22Nov12 – updates to fib Directory 2011 8