TG8.1 - Model technical specification for repairs and interventions

Task Group 8.1 is preparing a 'Compendium on Protection, Repair and Strengthening of Concrete Structures'. This aims to be a repository of large scope knowledge on the topic ‘rehabilitation’, containing short and specific (inspection, design, detailing, and execution) guidelines, listing reference documents (codes, technical reports, scientific papers) and presenting illustrative case studies on each subject.

A first draft of the compendium is almost ready to be reviewed by Commission 8 members, as well as by TG3.4 members. It is envisaged to be published as a technical report or a guide to good practice, depending on the commissions’ recommendations. The document includes three parts, organized in protection, repair and strengthening techniques. A template for methods’ guidelines, as well as a template for case-studies, has been delivered to authors to reach a harmonized presentation of each chapter.

Convener
Eduardo Júlio

View all members

get in touch

access network

documents

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.

Convener
José A. Campos e Matos

View all members

get in touch

access network

documents

TG8.8 - Design 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.

The work in TG8.8 is currently carried out in the Working Groups below.

Convener
Steinar Helland

Co-Convener
Joanitta Ndawula

View all members

get in touch

access network

documents

TG8.9 - Deterioration Mechanisms Related to Corrosion

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.

The scope:

• This Task Group shall investigate prediction tools (models)
• Derive revised design rules, which ensure sufficient durability close to broadly accepted reliability levels of limit states identified in TG8.8 and to be considered in TG8.9 and TG3.4
• The TG will provide specific input into MC2020 but is expected to continue as a COM8 TG to continuously develop the solutions for the issues listed.

The work in TG8.9 is currently carried out in the following Working Groups:

• TG8.9 WG1 - Corrosion Initiation – Convener: Amir Rahimi
• TG8.9 WG2 - Corrosion Propagation – Convener: Carmen Andrade
• TG8.9 WG3 - Chloride threshold – Conveners: Frank Papworth, Federica Lollini
• TG8.9 WG4 - Durability of steel Fiber reinforced Concrete (SFRC) – Convener: David Gardiner

Convener
Carmen Andrade

View all members

get in touch

access network

documents

TG8.11 - Testing and Monitoring

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.

The work in TG8.11 is currently carried out in the following Working Groups:

• TG8.11 WG1 - Testing New Concrete – Convener: Carola Edvardsen
• TG8.11 WG2 - Monitoring of Concrete – Convener: Joan Casas Rius

Convener
Carola Edvardsen

View all members

get in touch

access network

documents

TG8.12 - Deterioration mechanisms related to other phenomena

TBD

TBD

The work in TG8.12 is currently carried out in the following Working Groups:

• TG8.12 WG1 - Freeze-Thaw – Convener: Suraneni
• TG8.12 WG2 - Abrasion/erosion and cavitation – Convener: Thomas Vogel
• TG8.12 WG3 - Chemical and biogenic attack, and leaching – Convener: Bertron
• TG8.12 WG4 - Internal Attacks (ASR/DEF) – Convener: Rajabipour

Convener
Manu Santhanam

View all members

get in touch

access network

documents