Abstract
This paper discusses the need for reliable and valid multi-scale and multi-physics prediction models to support the design of new as well as the assessment, maintenance, and repair of existing reinforced concrete structures.
 A multi-physics and multi-scale deterioration model for chloride-induced corrosion of reinforced concrete has been established. Ongoing work includes extension of the model to 3D as well as modelling of the impact of the steel-concrete interface characteristics and electrochemical potential on chloride thresholds.
 Identified challenges include, among others, the improved understanding and modelling of single- and multi-deterioration mechanisms, environmental exposure, and data for validation.
 We envision that next generation maintenance and management of reinforced concrete infrastructure will combine numerical simulations based on multi-scale and multi-physics principles and extensive in-situ monitoring, allowing continuous Bayesian updating of 4D simulations of functional performance.
Highlights
A well‐functioning civil infrastructure form the foundation for quality of life for our society and enable global development and progress
Several challenges are related to the establishment and maintenance of the infrastructure covering, among others, aspects of sustainability, from environmental impacts over economy to societal impacts as well as climate change calling for reassessment and climate adaptation of existing structures
To quantify the structural performance of reinforced concrete elements affected by chloride‐induced reinforcement corrosion, a multi‐physics and multi‐scale model is being developed
Summary
A well‐functioning civil infrastructure form the foundation for quality of life for our society and enable global development and progress. Parametric design requires reliable and valid models and data These models need to be mechanism based and multi‐scale to allow for the use of innovative materials and structural solutions without long‐ term performance records. Requirements to circular materials economy will enforce recycling at highest level of structures, structural elements, and materials These changes call for generic mechanism based models to allow for design optimization and later structural assessment of existing structures. The fib Model Code for Service Life Design [6] and the ISO Standard 16204 [8] provide models for prediction of materials performance They do not support assessment at the structural level of deteriorated structures.
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