TG10.2 - Model Codes Updating

Building on the accomplishments of TG10.1, which in 2023 successfully delivered the fib Model Code (2020), TG10.2 aims to establish a continuous updating process for the fib Model Code. The motivation behind this initiative is to ensure the continued relevance, accuracy, and applicability of the Model Code in the dynamically evolving field of structural concrete. This effort aligns seamlessly with the long-term vision of COM 10 for ongoing Model Code enhancement consistent with the strategic goals outlined in the fib Roadmap to carbon neutrality in 2050.

The primary objective of TG10.2 is to systematically improve and update the fib Model Code in response to the continuous technology and knowledge development of materials, technologies and the structural forms that can potentially be created using structural concrete.

Convener
Agnieszka Bigaj

Co-convener
Gerrie Dieteren

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TG10.3 - Examples of the Model Code

The Model Code (2020) represents the accomplishments of extensive research, analysis, and collective expertise, embodying the most up-to-date insights and best practices in concrete engineering. This task group, aims to translate the principles outlined in the Model Code (2020) into tangible examples that will serve as guidance for professionals and practitioners across the globe. The efforts are to enhance the understanding and application of the Model Code.

The task group aims to develop examples that comprehend a diverse array of challenges and scenarios encountered in real-world applications. These examples will not only illustrate the principles espoused by the Model Code but also provide practical insights for structural engineers.

The TG10.3 will focus on developing real design examples derived from the fib Model Code (2020). Examples will cover various aspects of structural design practices as outlined in the Model Code. The examples will address a wide range of challenges and scenarios encountered in real-world applications of concrete design.

The objectives will guide the task group to develop examples that demonstrate the principles and best practices outlined in the fib Model Code, ultimately contributing to disseminate best practices in structural design.

The work in TG10.3 is currently carried out in the following Working Groups:

• TG10.3 WG1 - General Design – Convener: Daniel Miranda
• TG10.3 WG2 - Assessment of Existing Structures – Convener: Patrick Valeri
• TG10.3 WG3 - Design of FRC – Convener: Andrea Monserrat
• TG10.3 WG4 - Embedded FRP – Convener: Szinvai Szabolcs
• TG10.3 WG5 - Recycled Aggregates – Convener: Nikola Tosic

Convener
Marcelo Melo

Co-convener
Motohiro Ohno

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TG8.1 - Model technical specification for repairs and interventions

Task Group 8.1 has prepared a Guide (to good practice) on protection, repair, and strengthening techniques for concrete structures. Given the guide's extensive scope, it has been divided into two publications: bulletin 102, which addresses protection and repair methods, and bulletin 103, which focuses on strengthening methods. The chapters aim to provide practical guidelines and illustrative case studies to support the application of the pre-normative specifications in fib Model Code 2020.

For each protection, repair and strengthening method addressed in the Guide, readers have a description of when to adopt it, which materials and systems are required, which techniques are available, and what kind of equipment is needed. It then presents a summary of stakeholders’ roles and qualifications, design guidelines referring to most relevant codes and references, the intervention procedure, quality control measures and monitoring and maintenance activities.

A technical report titled “Restoring Reinforcement Passivity Through Replacement of Concrete Cover” is currently under review by members of Commission 8. Upon the publication of this report, Task Group 8.1 will have fulfilled its objectives, leading to its disbandment.

Convener
Eduardo Júlio

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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

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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

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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.

Convener
Carmen Andrade

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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.

Convener
Franziska Schmidt

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TG8.12 - Deterioration mechanisms related to other phenomena

Task Group 8.12 has a focus of addressing all durability phenomena other than corrosion due to chlorides and carbonation. The phenomena include Freeze Thaw, Chemical Attack, Abrasion/Erosion/Cavitation, and Internal Attacks (ASR / DEF).

Convener
Leandro Sánchez

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TG7.1 - Sustainable Concrete - general framework

Affordability, availability and variability of concrete in connection with strength and durability has made concrete the most used construction material in the world. Use of advanced concrete structures represents important potential in the way towards sustainability of built environment. Concrete and concrete structures should contribute to the development of a sustainably built environment in a socially, environmentally and economically responsible manner.

Definition of a basic framework of sustainable concrete design and an assessment considering environmental, economic and social aspects. The framework will focus on different types of concrete structures - buildings, bridges, roads, water structures etc. and their construction and operation in various specific regional conditions. The entire life cycle will be considered.

Commission Chair
Petr Hájek

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TG7.3 - Concrete made with recycled materials – Life cycle perspective

The objective of TG7.3 is to collect statistical data on concrete production, waste generation and those related to resource recycling in the world. The objective also includes an investigation of:

• the properties of recycled materials for concrete made from waste and by-products,
• the properties of concrete with recycled materials and their applications
• concrete recycling technologies, and
• the environmental impact caused during recycling of concrete waste.

Finally, TG7.3 will publish a state-of-the-art report on concrete with recycled materials such as demolished concrete, ceramics, glass, ashes, organic waste, etc. and to propose the ideal future for recycling concrete resources considering aspects of durability and recyclability of concrete, and minimising the environmental impact in the life cycle.

Convener
Takafumi Noguchi

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TG7.5 - Environmental product declarations (EPD) and equivalent performance of concrete

The objective of Task Group 7.5 will be two-fold:

• to recommend preferred approaches (road maps) for establishing "equivalent performance" of low environmental impact concrete typically containing high amounts of supplementary cementitious materials and therefore in terms of composition falls outside the prescriptions found in existing standards/regulations. By equivalent performance is understood that the concrete has acceptable production, structural and durability properties for its intended use. Clear road maps for establishing equivalent performance are a prerequisite and will likely act as a catalyst for increased use of such lower environmental impact concrete compositions to the benefit of the global community.
• to establish best available technologies for Environmental Product Declarations (EPDs) on concrete compositions (mix designs). EPDs are an emerging means, which, if performed on a common basis, allow a comparison of the environmental impact of different concrete compositions/products. As such, EPDs may be used by the consumer (end-user) to make a qualified decision concerning the choice of concrete, e.g. as requirements to the environmental performance can be verified and therefore also specified.

Convener
Costantino Menna

Co-Convener
Ladin Camci

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TG7.6 - Resilient structures

The objective of this task group is to highlight criticalities in current structural design practice and to provide fundamentals to address the design, the maintenance and the retrofit principles towards resilient structures in sustainable urban systems, and more broadly, in view of smart cities.

TG7.6 aims to develop guidelines to help diverse stakeholders involved within such processes to face resilience issues through a multiscale approach.

These guidelines will approach resilience issues according to a multiscale approach, starting from the single building scale. Structural design principles are rethought from the point of view of the practicality, reparability, robustness and serviceability in the aftermath of a catastrophe. Particularly, performance goals are recognised to define new resilience-based limit states, in order to enhance disaster preparedness and response of urban structures. Innovative and novel standards and metrics are implemented within the guidelines, as a support to the development of post-event strategic intervention, protection and response technologies and recovery strategies.

Convener
Domenico Asprone

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TG7.7 - Sustainable concrete masonry components and structures

Current requirements on energy efficiency, building comfort and sustainability have stimulated a growing use of new concrete technologies for construction and retrofit of (i) load-bearing walls in unreinforced, reinforced and confined masonry buildings and (ii) cladding, infill and partition walls in reinforced concrete or steel framed building structures. In that respect, researchers, designers, construction companies and building owners have paid special attention to the use of autoclaved aerated concrete (AAC) and light-weight aggregate concrete (LWAC) with recycled waste aggregates for production of innovative concrete masonry units (CMUs). It is also emphasised that CMUs may be formulated with special aggregates to produce specific colours or textures for finish use.

The scope and objective of TG7.7 will move in that direction in order to develop a general methodology for construction, design, assessment and retrofit of concrete masonry panels and walls.

Convener
Fulvio Parisi

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TG7.8 - Recycled Materials and industrial by-products for high performance reinforced concrete structures

The objective of Task Force 7.8 within fib Commission 7 is to address the sustainable use of materials through the effective exploitation of waste materials and industrial by-products, for the production of high-performance concrete with enhanced durability.

The objective of the task group 7.8 is to highlight critical aspects in current practice in waste recycling and use of secondary materials for high performance concrete. It shall address the state of the art, best practice and also identify and analyse gaps in the exploitation of waste materials with potential for delivery of high-performance durable concrete.

The task group aims at developing a framework for guidelines to help different stakeholders involved within the recycling industry and the producers of HPC, in order to facilitate the production and classification of materials but also their exploitation for HPC optimisation.

The Task Force is to address the following key areas:

• The production of high-performance concrete based on waste and industrial by-products.
• Use of waste materials as a substitute for aggregate
• Use of by-products as supplementary cementitious materials.
• Resilience of reinforced concrete structures with improved structural performance through the application of industrial by-products for safe structures, promoting sustainability practices.
• LCA applications & integrated end of life considerations for waste recycling to produce high performance concrete.
• Framework for Guidelines for the production and classification of waste and its application in high performance concrete.

Convener
Ruben Paul Borg

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