• COM8: Durability

    COM8: Durability

  • COM8: Durability

    COM8: Durability

Motivation

fib Commission 8 (COM8) aims to identify concrete-related durability issues, consider and review current information available on the topic, and provide guidance on materials and methods that will assist in optimal durability design of new structures and restoration design of existing structures.

Scope and objective of technical work

Service life design forms one part of this and COM8 will develop rational procedures to obtain an optimal technical-economic performance of concrete structures in service and to ensure that sustainability, whole-life cost and associated through-life perspectives are taken into account as part of the process by which experience gained from practice is fed back to the design, execution, maintenance and rehabilitation stages. COM8 work will address the structural service life aspects of structures with rational strategies, procedures and criteria for design, assessment, maintenance and remediation.

COM8 work also includes review of methods for the determination of inspection frequencies as well as methods based on sound engineering principles that will provide optimal information for the durability assessment of marine structures.

 

Lionel LingerCommission Chair
Lionel Linger
Carola EdvuardsenDeputy Chair
Carola Edvardsen

First name Last name Country Affiliation
- - - -
F. Javier León Spain FHECOR - Ingenieros Consultores
Dan Frangopol United States Lehigh University
Mark Alexander South Africa University of Cape Town
Doug Hooton Canada University of Toronto
Joost Gulikers Netherlands Rijkswaterstaat Centre for Infrastructure
Anders Ole Stubbe Solgaard Denmark Cowi A/S
Paul Sandeford Australia GHD Pty. Ltd
Daniel Anstice Australia GHD
Atsuro Moriwake Japan TOA Corporation
Giuseppe Carlo Marano Italy Politecnico di Bari
Václav Vimmr Czech Republic STú - K, a.s.
Gro Markeset Norway TDK, Institutt for bygg- og energiteknikk
Sara Sgobba Italy Private
Mohammed Safi Sweden Royal Institute of Technology (KTH)
Kai Osterminski Germany TU München
B. J. Wigum Iceland Mannvit Reykjavik
Vute Sirivivatnanon Australia Cement Concrete & Aggregate Australia
Josse Jacobs Belgium CSTC-WTCB-BBRI
Øystein Vennesland Norway NTNU
Paul Tikalsky United States The University of Utah
Adel El-Safty United States University of North Florida
Akira Hosoda Japan Yokohama National University
Daniel Straub Germany TU München
Raoul François France INSA
Thomas Vogel Switzerland ETH Zürich
Alice Alipour United States Iowa State University
Steinar Helland Norway S Helland Konsult
Aad Van Der Horst Netherlands Delft Univ. of Technology
Ali Akbar Ramezanianpour Iran, Islamic Republic Of Amirkabir Univ. of Technology
Carmen Andrade Spain Instituto Eduardo Torroja
Carola Edvardsen Denmark Cowi AS
Alberto Meda Italy University of Rome “Tor Vergata”
Norbert Randl Austria Carinthia Univ. of Applied Sciences
Zila Rinaldi Italy University of Rome “Tor Vergata”
Alfred Strauss Austria Univ. Bodenkultur Vienna
Amir Rahimi Germany Bundesanstalt für Wasserbau
Roberto Torrent Switzerland Quali- Ti-Mat Sagl
Lojze Bevc Slovenia ZAG Slovenije
Koichi Kobayashi Japan Gifu University
Ainars Paeglitis Latvia Riga Technical University
Nuno Ferreira United Kingdom Arup
Júlio Appleton Portugal A2P Consult
Christoph Gehlen Germany CBM
Toyoaki Miyagawa Japan Kyoto University
Frank Papworth Australia BCRC
John Cairns United Kingdom Heriot-Watt University
Stuart Matthews United Kingdom Consulting
David Fernández-Ordóñez Switzerland fib
Shoji Ikeda Japan Hybrid Research Inst. Inc.
Lionel Linger France Vinci Construction
Rui Miguel Ferreira Finland VTT Techn. Research Centre of Finland
Michael Bartholomew United States CH2M HILL
Tamon Ueda Japan Hokkaido University
José Campos e Matos Portugal University of Minho
Harshavardhan Subbarao India Construma Consultancy Pvt. Ltd.
Luis Neves United Kingdom Nottingham University
Joan Casas Rius Spain Tech. Univ. of Catalunya, UPC-BarcelonaTech
Stijn Matthys Belgium Magnel Lab. for Concrete Research
Frank Dehn Germany KIT Karlsruher Institut für Technologie
Claus Larsen Norway Norwegian Public Roads Administration
David Smith United Kingdom Atkins
Michael Thomas Canada University of New Brunswick
Takao Ueda Japan University of Tokushima
Eduardo Julio Portugal Instituto Superior Tecnico, Universidade de Lisboa
Jose Pacheco United States CTLGroup
Fuyuan Gong China Zhejiang University

  • TG8.1 - Model technical specification for repairs and interventions

    Task Group 8.1 is preparing a technical report on the subject of the requirements for a model specification for repairs and interventions with the goal of achieving publication as an fib bulletin. Consideration will be given as to whether this work should later be taken forward as a future Guide to Good Practice.

    A first draft report is under development. It has been decided to further develop the approach employed in a Norwegian document containing model technical specifications for a number of rehabilitation methods and align them to the Eurocode convention. In so doing it is envisaged that this report will deliver a model technical specification for a range of rehabilitation methods, each underpinned by their principles. Topics and techniques being considered for inclusion include: Concrete removal, concrete reinstatement, patch repair; surface treatments and coating; cathodic protection; chloride extraction; realkalisation; crack sealing; physical protection / barriers; cladding; inhibitors; electro–osmosis; sacrificial anode (in patch repair); strength; external reinforcement; jacketing; external pre-stressing and replacement and reconstruction of elements. These topics will be preceded by chapters covering the investigation of defective concrete from inspection and testing to monitoring.


    Eduardo JulioConvener
    Eduardo Julio

    First name Last name Country Affiliation
    - - - -
    Irina Stipanovic Oslakovic Netherlands University of Twente
    Anders Ole Stubbe Solgaard Denmark Cowi A/S
    Carola Edvardsen Denmark Cowi AS
    Júlio Appleton Portugal A2P Consult
    Toyoaki Miyagawa Japan Kyoto University
    Frank Papworth Australia BCRC
    John Cairns United Kingdom Heriot-Watt University
    David Fernández-Ordóñez Switzerland fib
    Shoji Ikeda Japan Hybrid Research Inst. Inc.
    Michael Bartholomew United States CH2M HILL
    Eduardo Cavaco Portugal Faculdade de Ciências e Tecnologia, Universidade NOVA de Lisboa
    José Manuel de Sena Cruz Portugal University of Minho
    Koichi Kobayashi Japan Gifu University
    João jramoacorreia Portugal Instituto Superior Técnico, University of Lisbon
    Repapis Constantinos Greece University of West Attica
    Meini Su United Kingdom University of Manchester
    Takashi Habuchi Japan Toa Corporation
    Mercedes Sánchez Moreno Spain Universidad de Córdoba
    André Monteiro Portugal National Laboratory for Civil Engineering
    Harshavardhan Subbarao India Construma Consultancy Pvt. Ltd.
    Lojze Bevc Slovenia ZAG Slovenije
    Christian Christodoulou United Kingdom AECOM Ltd
    Brett Pielstick United States Private
    Stephanos Dritsos Greece University of Patras
    Andreas Lampropoulos United Kingdom University of Brighton
    Ainars Paeglitis Latvia Riga Technical University
    Etsuji Kikuta Japan Civil Engineering Research Institute for Cold Region
    Luis Lima Argentina Private
    On Moseley Greece -
    David Smith United Kingdom Atkins
    Takao Ueda Japan University of Tokushima
    Christos Giarlelis Greece Equidas Consulting Engineers
    Nicholas Kyriakides Cyprus Cyprus University of Technology
    Luís Correia Portugal University of Minho
    Voula (S.J.) Pantazopoulou Canada The Lassonde Faculty of Engineering, York University
    Sofia Ribeiro Portugal Laboratório Nacional de Engenharia Civil, LNEC
    Theodoros Rousakis Greece Democritus University of Thrace
    Norbert Randl Austria Carinthia Univ. of Applied Sciences
    Eduardo Julio Portugal Instituto Superior Tecnico, Universidade de Lisboa
    Christoph Czaderski-Forchmann Switzerland EMPA, Structural Engineering
    Mark Verbaten Netherlands ABT bv

  • TG8.2 - Birth and re-birth certificates & through-life management aspects

    Task Group 8.2 (TG8.2) is preparing a technical report on the subject of birth and re-birth certificates & related through-life management aspects.

    The goal of the technical report is to develop a template for the rational approach to the assessment of a “Life Rating” for individual structures. The template will organise and analyse design parameters and as-built data in an effort to predict the type and frequency for in-service inspections. This information will then provide a mechanism for owners and engineers to optimise the inspection frequency providing a cost saving over time.


    Michael BartholomewConvener
    Michael Bartholomew

    First name Last name Country Affiliation
    - - - -
    Philip McKenna Ireland Halcrow Group Ltd., a CH2M HILL Company
    Giuseppe Carlo Marano Italy Politecnico di Bari
    Carola Edvardsen Denmark Cowi AS
    Lojze Bevc Slovenia ZAG Slovenije
    Ainars Paeglitis Latvia Riga Technical University
    Frank Papworth Australia BCRC
    John Cairns United Kingdom Heriot-Watt University
    Brett Pielstick United States Private
    David Fernández-Ordóñez Switzerland fib
    Michael Bartholomew United States CH2M HILL
    José Campos e Matos Portugal University of Minho
    Harshavardhan Subbarao India Construma Consultancy Pvt. Ltd.
    Ali Akbar Ramezanianpour Iran, Islamic Republic Of Amirkabir Univ. of Technology

  • TG8.3 - Operational document to support Service Life Design

    The motivation of fib Task Group 8.3 (TG8.3) is the need to introduce the advanced probabilistic approach in the design of service life and durability. The fib MC2010 has incorporated a performance approach for the durability design that is not known and experienced by current engineers. A document is needed to explain in detail and with examples the procedure and the meaning of designing by performance.

    The objective of TG8.3 is to develop a technical report that will provide operational guidance to support the practical implementation of fib/ISO Service Life Design codes and standards with the goal of achieving publication as a bulletin (following the publication of relevant service life design codes and standards).


    Carmen AndradeConvener
    Carmen Andrade

    First name Last name Country Affiliation
    - - - -
    Joost Gulikers Netherlands Rijkswaterstaat Centre for Infrastructure
    Irina Stipanovic Oslakovic Netherlands University of Twente
    Václav Vimmr Czech Republic STú - K, a.s.
    David Cleland United Kingdom Queen’s University Belfast
    Gro Markeset Norway TDK, Institutt for bygg- og energiteknikk
    Sara Sgobba Italy Private
    Carmen Andrade Spain Instituto Eduardo Torroja
    Carola Edvardsen Denmark Cowi AS
    Alberto Meda Italy University of Rome “Tor Vergata”
    Koichi Kobayashi Japan Gifu University
    Nuno Ferreira United Kingdom Arup
    Toyoaki Miyagawa Japan Kyoto University
    Frank Papworth Australia BCRC
    John Cairns United Kingdom Heriot-Watt University
    Stuart Matthews United Kingdom Consulting
    David Fernández-Ordóñez Switzerland fib
    Lionel Linger France Vinci Construction
    Michael Bartholomew United States CH2M HILL
    Harshavardhan Subbarao India Construma Consultancy Pvt. Ltd.

  • TG8.4 - Life cycle cost (LCC) - Design life and/or replacement cycle

    The work of TG8.4 comprises the preparation of a state-of-the-art report on LCC including the following:

    • A flow chart for life cycle cost analyses;
    • Examples and/or case studies concerning life cycle cost evaluations of design strategies,including narratives and consequences of the favoured strategy;
    • A risk analysis covering costs and benefits;
    • Identification of hazard scenarios (weak points);
    • Discussion on the value added by the LCC analyses including:
      • Design;
      • Inspection;
      • Testing;
      • Monitoring;
      • Birth Certificate;
      • Inspectability;
      • Interventions.
    • Reference to relevant fib documents.


    José A. Campos e MatosConvener
    José A. Campos e Matos

    First name Last name Country Affiliation
    - - - -
    Irina Stipanovic Oslakovic Netherlands University of Twente
    Anders Ole Stubbe Solgaard Denmark Cowi A/S
    Zila Rinaldi Italy University of Rome “Tor Vergata”
    Alfred Strauss Austria Univ. Bodenkultur Vienna
    David Fernández-Ordóñez Switzerland fib
    Frank Papworth Australia BCRC
    José Campos e Matos Portugal University of Minho
    Joan Casas Rius Spain Tech. Univ. of Catalunya, UPC-BarcelonaTech
    David Smith United Kingdom Atkins
    Hiroshi Akiyama Japan Tokyo Soil Research CO., LTD
    Stefania Arangio Italy Sapienza University of Rome
    Colin Caprani Australia Monash University
    Amr El-Dieb United Arab Emirates United Arab Emirates University
    Rui Miguel Ferreira Finland VTT Techn. Research Centre of Finland
    Dan Frangopol United States Lehigh University
    Joost Gulikers Netherlands Rijkswaterstaat Centre for Infrastructure
    Poul Linneberg Denmark COWI A/S
    Snezana Masovic Serbia University of Belgrade
    Ali Akbar Nezhad Australia UNSW Australia
    Drahomir Novak Czech Republic Technical University of Brno
    Nader M Okasha Saudi Arabia University of Hail, Hayil
    Xin Ruan China Tongji University
    Mohammed Safi Sweden Royal Institute of Technology (KTH)
    Mauricio Sanchez-Silva Colombia Universidad de Los Andes
    M. Semih Yücemen Turkey Middle East Technical University

  • TG8.5 - Durability of post-tensioning systems

    Task Group 8.5 (TG8.5) will produce an update of Bulletin 33, “Durability of post-tensioning tendons” (Recommendation published in 2005). This update will include a title change to address the ever changing post-tensioning systems and the advancement of tendon protection systems to include prepackaged grouts and wax systems.


    Brett H. PielstickConvener
    Brett H. Pielstick

    First name Last name Country Affiliation
    - - - -
    Mohammed Safi Sweden Royal Institute of Technology (KTH)
    Nuno Ferreira United Kingdom Arup
    Brett Pielstick United States Private
    David Fernández-Ordóñez Switzerland fib
    Michael Bartholomew United States CH2M HILL
    Gregory Hunsicker United States OnPoint Engineering and Technology LLC
    Luis Neves United Kingdom Nottingham University
    Larry Krauser United States General Technologies, Inc.
    Hans Rudolf Ganz Switzerland Ganz Consulting
    Jan Laco United Kingdom Atkins
    Teddy Theryo United States Florida Department of Transportation

  • TG8.7 - Durability design of steel fibre reinforced concrete

    Steel fibres are supported in MC2010 but no limitation are placed on their use in regards durability. While it is recognised that Steel Fibre Reinforced Concrete (SFRC) may be highly durable, steel fibres do corrode in some exposures and when corrosion occurs a very small loss of fibre thickness may lead to significant loss of concrete performance. Although structural guidance codes for SFRC exist today, and provide valuable design information and procedures, durable structures may not result in exposure classes XD2, XD2, XS3 and XD3 (DafStb Guideline on Steel fibre reinforced concrete) due to the lack of any durability guidance. At best current codes suggest the need for special provisions for exposure class 3 or higher (RILEM TC 162-TDF) without providing durability design methods.

    A literature review of research and use of steel fibres in concrete in regards durability will be the main method of developing and understanding the performance of SFRC under several exposure environments. The group will consider the notion of critical chloride content distributions that support initiation of fibre corrosion, alkalinity reduction due to carbonation and the effect of cracking with regard to fibre corrosion. The aim is to define model equations that also consider reduction of mechanical capacity. This will include a review of loss of concrete performance vs corrosion of fibres considering fibre types, steel types and fibre surface effects due to the manufacturing and installation processess. Also to be reviewed is the effects of mix designs and quality control on corrosion resistance.


    Nuno FerreiraConvener
    Nuno Ferreira

    First name Last name Country Affiliation
    - - - -
    David Fernández-Ordóñez Switzerland fib
    Frank Papworth Australia BCRC
    Anders Ole Stubbe Solgaard Denmark Cowi A/S
    Alberto Meda Italy University of Rome “Tor Vergata”
    Gerhard Vitt Germany Bekaert GmbH
    Nuno Ferreira United Kingdom Arup
    Carola Edvardsen Denmark Cowi AS
    Joost Gulikers Netherlands Rijkswaterstaat Centre for Infrastructure
    Carlos Gil Berrocal Sweden Chalmers University of Technology
    Véronique Bouteiller France IFSTTAR
    Federica Lollini Italy Politecnico di Milano
    Lionel Linger France Vinci Construction
    Alexander Michel Denmark DTU
    Sotiris Psomas United Kingdom Morgan Sindall
    Lucie Vandewalle Belgium KULeuven
    Marco di Prisco Italy Politecnico di Milano

  • TG8.8 - Common approaches

    Throughout durability design there are a number of common inputs that should be handled in a consistent approach, e.g. reliability, cracking, exposure risk assessment, verification approaches.

    This Task Group will maintain approaches that are consistent across different materials and durability design approaches consistency and provide liaison with other Commissions to ensure consistency across all aspects of Model Code.

    The scope:

    • This Task Group shall investigate various aspects that have a common impact on modelling of deterioration mechanisms but the TG is not directly involved in the mechanisms or materials.
    • Many of these items are fundamental to all aspects of structural design and cannot be
    • considered durability issues alone. However, the issues are key to durability design.

    Consider “Levels of Approximation” approach in durability design and set out how it is to be incorporated in durability design using the four durability verification approaches, inspection and testing and materials evaluation.


    Steinar HellandConvener
    Steinar Helland

    First name Last name Country Affiliation
    - - - -
    Philipp Bamforth United Kingdom Construction Consultancy
    Jonathan Mai-Nhu France CERIB
    Raymond Ian Gilbert Australia School of Civil and Environmental Engineering
    Konstantin Kovler Israel Technion - Israel Institute of Technology
    Stefanie Von Greve-Dierfeld Switzerland TFB Technology and Research for Concrete Structures
    Steinar Helland Norway S Helland Konsult
    François Toutlemonde France IFSTTAR
    David Fernández-Ordóñez Switzerland fib
    Lionel Linger France Vinci Construction
    Frank Papworth Australia BCRC
    Michael Bartholomew United States CH2M HILL
    Hans-Dieter Beushausen South Africa University of Cape Town
    Stuart Curtis Australia RTR Bridge Construction Services
    Jean Michel Torrenti France IFSTTAR
    R. William Cox United States Am. Segmental Bridge Inst.
    Claus Nielsen Denmark DTI - Danish Technological Institute

  • TG8.9 - Deterioration Mechanisms

    TG8.9 will investigate models for the following deterioration processes: Rebar Corrosion Initiation; Rebar Corrosion Propagation; Abrasion, Erosion and Cavitation; Freeze Thaw Attack; Leaching; Water and Water Vapour Migration and Chemical Attack.

    In MC2010 and Bulletin 34, some of these mechanisms have only loosely defined models and some have no models. MC2010 also has limited advice for exposure classes, performance tests, deemed to satisfy requirements and avoidance approaches.

    None of the deterioration processes have been developed in the fib documents for assessment of existing structures residual life. Design guidance for this phase is a primary objective for TG8.9.

    Model Code 2010 notes that a structures robustness (AG10) could be compromised by deterioration but it provides no details of what these failures might be or measures to be taken to avoid them.


    Carmen AndradeConvener
    Carmen Andrade
    Christophe GehlenConvener
    Christophe Gehlen

    First name Last name Country Affiliation
    - - - -
    Carmen Andrade Spain Instituto Eduardo Torroja
    David Fernández-Ordóñez Switzerland fib
    Carola Edvardsen Denmark Cowi AS
    Christoph Gehlen Germany CBM
    Steinar Helland Norway S Helland Konsult
    Stefanie Von Greve-Dierfeld Switzerland TFB Technology and Research for Concrete Structures
    Manu Santhanam India IIT Madras
    Amir Rahimi Germany Bundesanstalt für Wasserbau

  • TG8.10 - Steel reinforcement

    The key objective of this task group is to provide clear design procedures for the four durability verification methods in MC2010 for metallic reinforcements in concrete.

    Extensive as MC2010 is on durability design, it does not give any guidance on specialty reinforcement noting only, “The following special types of steel that show enhanced corrosion protection properties can be used: galvanized steels, epoxy coated steels and stainless steels”. Use of reinforcement with a high resistance to corrosion has the potential to reduce the impost of reinforcement corrosion by orders of magnitude. With appropriate design procedures, specialty steel can significantly reduce cover requirements leading to increased sustainability. Therefore, it is important to develop clear approaches to durability deign using these materials for MC2020.

    Pre-tensioned elements are typically specified to have higher covers and lower crack widths than low carbon steel. It is unclear if the higher covers fully account for the lower critical chloride level, different failure mechanisms and higher reliability requirements based on mode of failure. It is also unclear whether these higher protection requirements are universally required or if they can be relaxed based on the steel specification. This needs to be resolved for MC2020.


    Frank PapworthConvener
    Frank Papworth

    First name Last name Country Affiliation
    - - - -
    Ivica Zivanovic France Freyssinet
    Carmen Andrade Spain Instituto Eduardo Torroja
    David Fernández-Ordóñez Switzerland fib
    Frank Papworth Australia BCRC
    Warren Green Australia Vinsi Partners
    Peter Golding Australia Galvanizers Association of Australia
    Jan Vítek Czech Republic Metrostav a. s.

  • TG8.11 - Testing of new concrete

    Durability design of concrete structures may incorporate a number of performance-based requirements depending on the deterioration mechanisms and exposure conditions to consider. While exposure definitions and performance-based requirements are dealt with in other fib TG’s, well documented test procedures for relevant materials properties are needed for support of the durability design and subsequent quality assurance. This includes well-founded probabilistic definitions for those properties.

    The objective of Task Group 8.11 is to provide guidance on test methods and corresponding acceptance criteria and testing frequencies concerning quality assurance of concrete production. Furthermore, the objective is to link performance-requirements of concrete as yielded from durability design with the execution. For the latter, all stages of concrete production, i.e. pre-testing in the laboratory, trial testing in laboratory and on-site, and testing of running production are considered.


    Carola EdvardsenConvener
    Carola Edvardsen

    First name Last name Country Affiliation
    - - - -
    Sarah Schmiedel Germany Universität (Campus Süd) Institut für Massivbau und Baustofftechnologie
    Federica Lollini Italy Politecnico di Milano
    Michael Vogel Germany Karlsruher Institut für Technologie (KIT) - Universität (Campus Süd)
    Anders Ole Stubbe Solgaard Denmark Cowi A/S
    Ivica Zivanovic France Freyssinet
    Carmen Andrade Spain Instituto Eduardo Torroja
    David Fernández-Ordóñez Switzerland fib
    Irina Stipanovic Oslakovic Netherlands University of Twente
    Frank Dehn Germany KIT Karlsruher Institut für Technologie
    Nuno Ferreira United Kingdom Arup
    Carola Edvardsen Denmark Cowi AS
    Lionel Linger France Vinci Construction
    Hans-Dieter Beushausen South Africa University of Cape Town
    Christoph Gehlen Germany CBM
    Stefanie Von Greve-Dierfeld Switzerland TFB Technology and Research for Concrete Structures
    Amir Rahimi Germany Bundesanstalt für Wasserbau
    Guillermo Di Pace Argentina Di Pace - Rhor Consulting
    Doug Hooton Canada University of Toronto
    Alfred Strauss Austria Univ. Bodenkultur Vienna
    Roberto Torrent Switzerland Quali- Ti-Mat Sagl

 

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