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.
|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|
|Giuseppe Carlo||Marano||Italy||Politecnico di Bari|
|Václav||Vimmr||Czech Republic||STú - K, a.s.|
|Gro||Markeset||Norway||TDK, Institutt for bygg- og energiteknikk|
|Mohammed||Safi||Sweden||Royal Institute of Technology (KTH)|
|B. J.||Wigum||Iceland||Mannvit Reykjavik|
|Vute||Sirivivatnanon||Australia||Cement Concrete & Aggregate Australia|
|Paul||Tikalsky||United States||The University of Utah|
|Adel||El-Safty||United States||University of North Florida|
|Akira||Hosoda||Japan||Yokohama National University|
|Alice||Alipour||United States||Iowa State University|
|Steinar||Helland||Norway||S Helland Konsult|
|Aad||Van Der Horst||Netherlands||BAM Infraconsult bv.|
|Ali Akbar||Ramezanianpour||Iran, Islamic Republic of||Amirkabir Univ. of Technology|
|Carola K.||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|
|Ainars||Paeglitis||Latvia||Riga Technical University|
|John||Cairns||United Kingdom||Heriot-Watt University|
|Shoji||Ikeda||Japan||Hybrid Research Inst. Inc.|
|Rui Miguel||Ferreira||Finland||VTT Techn. Research Centre of Finland|
|Michael||Bartholomew||United States||CH2M HILL|
|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|
|Frank||Dehn||Germany||KIT Karlsruher Institut für Technologie|
|Claus||Larsen||Norway||Norwegian Public Roads Administration|
|Michael||Thomas||Canada||University of New Brunswick|
|Takao||Ueda||Japan||University of Tokushima|
|Eduardo||Julio||Portugal||Instituto Superior Tecnico, Universidade de Lisboa|
|Agnieszka||Bigaj-van Vliet||Netherlands||TNO-Built Environment + Geosciences|
|Qing-feng||LIU||China||Shanghai Jiao Tong University|
- TG8.1 - Model technical specification for repairs and interventions
- TG8.2 - Birth and re-birth certificates & through-life management aspects
- TG8.3 - Operational document to support Service Life Design
- TG8.4 - Life cycle cost (LCC) - Design life and/or replacement cycle
- TG8.5 - Durability of post-tensioning systems
- TG8.7 - Durability design of steel fibre reinforced concrete
- TG8.8 - Common approaches
- TG8.9 - Deterioration Mechanisms
- TG8.10 - Steel reinforcement
- TG8.11 - Testing of new concrete
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.
First name Last name Country Affiliation Irina Stipanovic Oslakovic Netherlands University of Twente Anders Ole Stubbe Solgaard Denmark Cowi A/S Carola K. 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 Constantinos Repapis 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 - 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 UNNOBA 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 Jan Laco United Kingdom Atkins
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.
First name Last name Country Affiliation Philip McKenna Ireland Halcrow Group Ltd., a CH2M HILL Company Giuseppe Carlo Marano Italy Politecnico di Bari Carola K. 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 - 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).
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 - Carola K. 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:
- Birth Certificate;
- Reference to relevant fib documents.
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.
First name Last name Country Affiliation Mohammed Safi Sweden Royal Institute of Technology (KTH) Nuno Ferreira United Kingdom Arup Brett Pielstick United States - 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.
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 K. 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.
- 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.
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 Agnieszka Bigaj-van Vliet Netherlands TNO-Built Environment + Geosciences
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.
First name Last name Country Affiliation Carmen Andrade Spain - David Fernández-Ordóñez Switzerland fib Carola K. 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.
First name Last name Country Affiliation Ivica Zivanovic France Freyssinet Carmen Andrade Spain - 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.
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 - 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 K. 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 Agnieszka Bigaj-van Vliet Netherlands TNO-Built Environment + Geosciences