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|
|León||F. Javier||Spain||FHECOR - Ingenieros Consultores|
|Frangopol||Dan||United States||Lehigh University|
|Alexander||Mark||South Africa||University of Cape Town|
|Hooton||Doug||Canada||University of Toronto|
|Gulikers||Joost||Netherlands||Rijkswaterstaat Centre for Infrastructure|
|Solgaard||Anders Ole Stubbe||Denmark||Cowi A/S|
|Sandeford||Paul||Australia||GHD Pty. Ltd|
|Marano||Giuseppe Carlo||Italy||Politecnico di Bari|
|Vimmr||Václav||Czech Republic||STú - K, a.s.|
|Markeset||Gro||Norway||TDK, Institutt for bygg- og energiteknikk|
|Safi||Mohammed||Sweden||Royal Institute of Technology (KTH)|
|Wigum||B. J.||Iceland||Mannvit Reykjavik|
|Sirivivatnanon||Vute||Australia||Cement Concrete & Aggregate Australia|
|Tikalsky||Paul||United States||The University of Utah|
|El-Safty||Adel||United States||University of North Florida|
|Hosoda||Akira||Japan||Yokohama National University|
|Alipour||Alice||United States||Iowa State University|
|Helland||Steinar||Norway||S Helland Konsult|
|Van Der Horst||Aad||Netherlands||BAM Infraconsult bv.|
|Ramezanianpour||Ali Akbar||Iran, Islamic Republic of||Amirkabir Univ. of Technology|
|Edvardsen||Carola K.||Denmark||Cowi AS|
|Meda||Alberto||Italy||University of Rome “Tor Vergata”|
|Randl||Norbert||Austria||Carinthia Univ. of Applied Sciences|
|Rinaldi||Zila||Italy||University of Rome “Tor Vergata”|
|Strauss||Alfred||Austria||Univ. Bodenkultur Vienna|
|Rahimi||Amir||Germany||Bundesanstalt für Wasserbau|
|Torrent||Roberto||Switzerland||Quali- Ti-Mat Sagl|
|Paeglitis||Ainars||Latvia||Riga Technical University|
|Cairns||John||United Kingdom||Heriot-Watt University|
|Ikeda||Shoji||Japan||Hybrid Research Inst. Inc.|
|Ferreira||Rui Miguel||Finland||VTT Techn. Research Centre of Finland|
|Bartholomew||Michael||United States||CH2M HILL|
|Campos e Matos||José||Portugal||University of Minho|
|Subbarao||Harshavardhan||India||Construma Consultancy Pvt. Ltd.|
|Neves||Luis||United Kingdom||Nottingham University|
|Casas Rius||Joan||Spain||Tech. Univ. of Catalunya, UPC-BarcelonaTech|
|Dehn||Frank||Germany||KIT Karlsruher Institut für Technologie|
|Larsen||Claus||Norway||Norwegian Public Roads Administration|
|Thomas||Michael||Canada||University of New Brunswick|
|Ueda||Takao||Japan||University of Tokushima|
|Julio||Eduardo||Portugal||Instituto Superior Tecnico, Universidade de Lisboa|
|Bigaj-van Vliet||Agnieszka||Netherlands||TNO-Built Environment + Geosciences|
- 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 Stipanovic Oslakovic Irina Netherlands University of Twente Solgaard Anders Ole Stubbe Denmark Cowi A/S Edvardsen Carola K. Denmark Cowi AS Appleton Júlio Portugal A2P Consult Miyagawa Toyoaki Japan Kyoto University Papworth Frank Australia BCRC Cairns John United Kingdom Heriot-Watt University Fernández-Ordóñez David Switzerland fib Ikeda Shoji Japan Hybrid Research Inst. Inc. Bartholomew Michael United States CH2M HILL Cavaco Eduardo Portugal Faculdade de Ciências e Tecnologia, Universidade NOVA de Lisboa de Sena Cruz José Manuel Portugal University of Minho Kobayashi Koichi Japan Gifu University jramoacorreia João Portugal Instituto Superior Técnico, University of Lisbon Constantinos Repapis Greece University of West Attica Su Meini United Kingdom University of Manchester Habuchi Takashi Japan Toa Corporation Sánchez Moreno Mercedes Spain Universidad de Córdoba Monteiro André Portugal National Laboratory for Civil Engineering Subbarao Harshavardhan India Construma Consultancy Pvt. Ltd. Bevc Lojze Slovenia ZAG Slovenije Christodoulou Christian United Kingdom AECOM Ltd Pielstick Brett United States - Dritsos Stephanos Greece University of Patras Lampropoulos Andreas United Kingdom University of Brighton Paeglitis Ainars Latvia Riga Technical University Kikuta Etsuji Japan Civil Engineering Research Institute for Cold Region Lima Luis Argentina UNNOBA Moseley On Greece - Smith David United Kingdom Atkins Ueda Takao Japan University of Tokushima Giarlelis Christos Greece Equidas Consulting Engineers Kyriakides Nicholas Cyprus Cyprus University of Technology Correia Luís Portugal University of Minho Pantazopoulou Voula (S.J.) Canada The Lassonde Faculty of Engineering, York University Ribeiro Sofia Portugal Laboratório Nacional de Engenharia Civil, LNEC Rousakis Theodoros Greece Democritus University of Thrace Randl Norbert Austria Carinthia Univ. of Applied Sciences Julio Eduardo Portugal Instituto Superior Tecnico, Universidade de Lisboa Czaderski-Forchmann Christoph Switzerland EMPA, Structural Engineering Verbaten Mark Netherlands ABT bv Laco Jan 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 McKenna Philip Ireland Halcrow Group Ltd., a CH2M HILL Company Marano Giuseppe Carlo Italy Politecnico di Bari Edvardsen Carola K. Denmark Cowi AS Bevc Lojze Slovenia ZAG Slovenije Paeglitis Ainars Latvia Riga Technical University Papworth Frank Australia BCRC Cairns John United Kingdom Heriot-Watt University Pielstick Brett United States - Fernández-Ordóñez David Switzerland fib Bartholomew Michael United States CH2M HILL Campos e Matos José Portugal University of Minho Subbarao Harshavardhan India Construma Consultancy Pvt. Ltd. Ramezanianpour Ali Akbar 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 Gulikers Joost Netherlands Rijkswaterstaat Centre for Infrastructure Stipanovic Oslakovic Irina Netherlands University of Twente Vimmr Václav Czech Republic STú - K, a.s. Cleland David United Kingdom Queen’s University Belfast Markeset Gro Norway TDK, Institutt for bygg- og energiteknikk Sgobba Sara Italy Private Andrade Carmen Spain - Edvardsen Carola K. Denmark Cowi AS Meda Alberto Italy University of Rome “Tor Vergata” Kobayashi Koichi Japan Gifu University Ferreira Nuno United Kingdom Arup Miyagawa Toyoaki Japan Kyoto University Papworth Frank Australia BCRC Cairns John United Kingdom Heriot-Watt University Matthews Stuart United Kingdom Consulting Fernández-Ordóñez David Switzerland fib Linger Lionel France Vinci Construction Bartholomew Michael United States CH2M HILL Subbarao Harshavardhan 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 Stipanovic Oslakovic Irina Netherlands University of Twente Solgaard Anders Ole Stubbe Denmark Cowi A/S Rinaldi Zila Italy University of Rome “Tor Vergata” Strauss Alfred Austria Univ. Bodenkultur Vienna Fernández-Ordóñez David Switzerland fib Papworth Frank Australia BCRC Campos e Matos José Portugal University of Minho Casas Rius Joan Spain Tech. Univ. of Catalunya, UPC-BarcelonaTech Smith David United Kingdom Atkins Akiyama Hiroshi Japan Tokyo Soil Research CO., LTD Arangio Stefania Italy Sapienza University of Rome Caprani Colin Australia Monash University El-Dieb Amr United Arab Emirates United Arab Emirates University Ferreira Rui Miguel Finland VTT Techn. Research Centre of Finland Frangopol Dan United States Lehigh University Gulikers Joost Netherlands Rijkswaterstaat Centre for Infrastructure Linneberg Poul Denmark COWI A/S Masovic Snezana Serbia University of Belgrade Akbar Nezhad Ali Australia UNSW Australia Novak Drahomir Czech Republic Technical University of Brno Okasha Nader M Saudi Arabia University of Hail, Hayil Ruan Xin China Tongji University Safi Mohammed Sweden Royal Institute of Technology (KTH) Sanchez-Silva Mauricio Colombia Universidad de Los Andes Yücemen M. Semih 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 Safi Mohammed Sweden Royal Institute of Technology (KTH) Ferreira Nuno United Kingdom Arup Pielstick Brett United States - Fernández-Ordóñez David Switzerland fib Bartholomew Michael United States CH2M HILL Hunsicker Gregory United States OnPoint Engineering and Technology LLC Neves Luis United Kingdom Nottingham University Krauser Larry United States General Technologies, Inc. Ganz Hans Rudolf Switzerland Ganz Consulting Laco Jan United Kingdom Atkins Theryo Teddy 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 Fernández-Ordóñez David Switzerland fib Papworth Frank Australia BCRC Solgaard Anders Ole Stubbe Denmark Cowi A/S Meda Alberto Italy University of Rome “Tor Vergata” Vitt Gerhard Germany Bekaert GmbH Ferreira Nuno United Kingdom Arup Edvardsen Carola K. Denmark Cowi AS Gulikers Joost Netherlands Rijkswaterstaat Centre for Infrastructure Gil Berrocal Carlos Sweden Chalmers University of Technology Bouteiller Véronique France IFSTTAR Lollini Federica Italy Politecnico di Milano Linger Lionel France Vinci Construction Michel Alexander Denmark DTU Psomas Sotiris United Kingdom Morgan Sindall Vandewalle Lucie Belgium KULeuven di Prisco Marco 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 Bamforth Philipp United Kingdom Construction Consultancy Mai-Nhu Jonathan France CERIB Gilbert Raymond Ian Australia School of Civil and Environmental Engineering Kovler Konstantin Israel Technion - Israel Institute of Technology Von Greve-Dierfeld Stefanie Switzerland TFB Technology and Research for Concrete Structures Helland Steinar Norway S Helland Konsult Toutlemonde François France IFSTTAR Fernández-Ordóñez David Switzerland fib Linger Lionel France Vinci Construction Papworth Frank Australia BCRC Bartholomew Michael United States CH2M HILL Beushausen Hans-Dieter South Africa University of Cape Town Curtis Stuart Australia RTR Bridge Construction Services Torrenti Jean Michel France IFSTTAR Cox R. William United States Am. Segmental Bridge Inst. Nielsen Claus Denmark DTI - Danish Technological Institute Bigaj-van Vliet Agnieszka 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 Andrade Carmen Spain - Fernández-Ordóñez David Switzerland fib Edvardsen Carola K. Denmark Cowi AS Gehlen Christoph Germany CBM Helland Steinar Norway S Helland Konsult Von Greve-Dierfeld Stefanie Switzerland TFB Technology and Research for Concrete Structures Santhanam Manu India IIT Madras Rahimi Amir 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 Zivanovic Ivica France Freyssinet Andrade Carmen Spain - Fernández-Ordóñez David Switzerland fib Papworth Frank Australia BCRC Green Warren Australia Vinsi Partners Golding Peter Australia Galvanizers Association of Australia Vítek Jan 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 Schmiedel Sarah Germany Universität (Campus Süd) Institut für Massivbau und Baustofftechnologie Lollini Federica Italy Politecnico di Milano Vogel Michael Germany Karlsruher Institut für Technologie (KIT) - Universität (Campus Süd) Solgaard Anders Ole Stubbe Denmark Cowi A/S Zivanovic Ivica France Freyssinet Andrade Carmen Spain - Fernández-Ordóñez David Switzerland fib Stipanovic Oslakovic Irina Netherlands University of Twente Dehn Frank Germany KIT Karlsruher Institut für Technologie Ferreira Nuno United Kingdom Arup Edvardsen Carola K. Denmark Cowi AS Linger Lionel France Vinci Construction Beushausen Hans-Dieter South Africa University of Cape Town Gehlen Christoph Germany CBM Von Greve-Dierfeld Stefanie Switzerland TFB Technology and Research for Concrete Structures Rahimi Amir Germany Bundesanstalt für Wasserbau Di Pace Guillermo Argentina Di Pace - Rhor Consulting Hooton Doug Canada University of Toronto Strauss Alfred Austria Univ. Bodenkultur Vienna Torrent Roberto Switzerland Quali- Ti-Mat Sagl Bigaj-van Vliet Agnieszka Netherlands TNO-Built Environment + Geosciences