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|
|Philip||McKenna||Ireland||Halcrow Group Ltd., a CH2M HILL Company|
|Mark||Alexander||South Africa||University of Cape Town|
|Joost||Gulikers||Netherlands||Rijkswaterstaat Centre for Infrastructure|
|Scott||Smith||Australia||Southern Cross University|
|Irina||Stipanovic Oslakovic||Netherlands||University of Twente|
|Anders Ole Stubbe||Solgaard||Denmark||-|
|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|
|Alexandra||Neves||Mozambique||Tecnica-Engenh. Consult. Lda|
|B. J.||Wigum||Iceland||Mannvit Reykjavik|
|Vute||Sirivivatnanon||Australia||Cement Concrete & Aggregate Australia|
|Adel||El-Safty||United States||University of North Florida|
|Akira||Hosoda||Japan||Yokohama National University|
|Alice||Alipour||COM_COMMUNITY_LANG_NAME_||Iowa State University|
|Steinar||Helland||Norway||S Helland Konsult|
|Aad||Van Der Horst||Netherlands||Delft Univ. of Technology|
|Agnieszka||Bigaj-van Vliet||Netherlands||TNO-Built Environment + Geosciences|
|Ali Akbar||Ramezanianpour||Iran, Islamic Republic Of||Amirkabir Univ. of Technology|
|Carmen||Andrade||Spain||Instituto Eduardo Torroja|
|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|
|Harshavardhan||Subbarao||India||Construma Consultancy Pvt. Ltd.|
|Amir||Rahimi||Germany||Bundesanstalt für Wasserbau|
|Roberto||Torrent||Switzerland||Quali- Ti-Mat Sagl|
|Michael||Bartholomew||United States||CH2M HILL|
|Stijn||Matthys||Belgium||Magnel Lab. for Concrete Research|
|Ainars||Paeglitis||Latvia||Techn. University Riga|
|Eduardo||Julio||Portugal||University of Lisboa|
|John||Cairns||United Kingdom||Heriot-Watt University|
|Stuart||Matthews||United Kingdom||Building Research Establishment Ltd|
|Shoji||Ikeda||Japan||Hybrid Research Inst. Inc.|
- 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
- TG8.6 - Calibration of code deemed-to-satisfy provisions for durability
- TG8.7 - Durability design of steel fibre reinforced 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 - - - - F. Javier León Spain FHECOR - Ingenieros Consultores Philip McKenna Ireland Halcrow Group Ltd., a CH2M HILL Company Scott Smith Australia Southern Cross University Irina Stipanovic Oslakovic Netherlands University of Twente Anders Ole Stubbe Solgaard Denmark - Paul Sandeford Australia GHD Pty. Ltd Daniel Anstice Australia - Atsuro Moriwake Japan - Tamon Ueda Japan Hokkaido University Carola Edvardsen Denmark Cowi AS Harshavardhan Subbarao India Construma Consultancy Pvt. Ltd. Michael Bartholomew United States CH2M HILL Júlio Appleton Portugal A2P Consult Toyoaki Miyagawa Japan Kyoto University Ali Akbar Ramezanianpour Iran, Islamic Republic Of Amirkabir Univ. of Technology Eduardo Julio Portugal University of Lisboa Frank Papworth Australia BCRC John Cairns United Kingdom Heriot-Watt University David Fernández-Ordóñez Switzerland fib Shoji Ikeda Japan Hybrid Research Inst. Inc.
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 Edvardsen Denmark Cowi AS Harshavardhan Subbarao India Construma Consultancy Pvt. Ltd. Michael Bartholomew United States CH2M HILL Lojze Bevc Slovenia ZAG Slovenije Ainars Paeglitis Latvia Techn. University Riga Frank Papworth Australia BCRC John Cairns United Kingdom Heriot-Watt University Brett Pielstick United States Private David Fernández-Ordóñez Switzerland fib
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 - Carmen Andrade Spain Instituto Eduardo Torroja Carola Edvardsen Denmark Cowi AS Alberto Meda Italy University of Rome “Tor Vergata” Harshavardhan Subbarao India Construma Consultancy Pvt. Ltd. Michael Bartholomew United States CH2M HILL 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 Building Research Establishment Ltd David Fernández-Ordóñez Switzerland fib Lionel Linger France Vinci Construction
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 - - - - Philip McKenna Ireland Halcrow Group Ltd., a CH2M HILL Company Irina Stipanovic Oslakovic Netherlands University of Twente Anders Ole Stubbe Solgaard Denmark - Carola Edvardsen Denmark Cowi AS Zila Rinaldi Italy University of Rome “Tor Vergata” Alfred Strauss Austria Univ. Bodenkultur Vienna David Fernández-Ordóñez Switzerland fib Lionel Linger France Vinci Construction
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 - Alexandra Neves Mozambique Tecnica-Engenh. Consult. Lda Michael Bartholomew United States CH2M HILL Nuno Ferreira United Kingdom Arup Brett Pielstick United States Private David Fernández-Ordóñez Switzerland fib
TG8.6 - Calibration of code deemed-to-satisfy provisions for durability
The objective of Task Group 8.6 is to give an overview of the current deemed-to-satisfy rules and of the corresponding levels of reliability regarding durability in order to give suggestions on how current deemed-to-satisfy rules can be improved.
The group should undertake a review of the background of deemed-to-satisfy options for concrete mixes for specified service life situations. The work involves a calibration of the reliability levels provided by current deemed-to-satisfy options.
First name Last name Country Affiliation - - - - Philip McKenna Ireland Halcrow Group Ltd., a CH2M HILL Company Joost Gulikers Netherlands Rijkswaterstaat Centre for Infrastructure Gro Markeset Norway TDK, Institutt for bygg- og energiteknikk Sara Sgobba Italy - Kai Osterminski Germany - Steinar Helland Norway S Helland Konsult Carmen Andrade Spain Instituto Eduardo Torroja Carola Edvardsen Denmark Cowi AS Amir Rahimi Germany Bundesanstalt für Wasserbau Michael Bartholomew United States CH2M HILL Christoph Gehlen Germany CBM Frank Papworth Australia BCRC David Fernández-Ordóñez Switzerland fib
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