Abstract
Modelling the ingress of chloride ions into the cover of a concrete structure is a phenomenon that is gaining an increasing attention of the research community, but even more, from the engineering practice. As the mechanism that drives the ingress of chlorides is implicitly responsible for the service-life of concrete structures, its input parameters are a major issue whenever predicting the service-life of new concrete structures. In this paper most relevant parameters involved in the evaluation of chloride ingress models are discussed and related to the benchmark activities that currently run in RILEM TC 270-CIM on benchmarking Chloride Ingress Models. The results provide an overview of the models used in the structural design stage, mostly analytical models, and in the rehabilitation stage, mostly numerical models.
Highlights
Current models used to predict the service of reinforced concrete structures are mostly based on the ingress of chlorides with time
If this gradient would not exist, chlorides would stay where they are and the service life would be much longer and determined by another damage mechanism that causes the concrete to deteriorate. Another reason that affects the rate at which chlorides move through the pore structure of a cover is the diffusion coefficient, which is the rate determining parameter that linearly affects the movement of the chlorides through the concrete cover
Current paper gives an impression about most relevant aspects that play a role when benchmarking chloride ingress models
Summary
Current models used to predict the (remaining) service of reinforced concrete structures are mostly based on the ingress of chlorides with time. The chloride concentration gradient over the cover thickness is the major player in a chloride ingress model, since it is one of the reasons that chlorides start to move If this gradient would not exist, chlorides would stay where they are and the service life would be much longer and determined by another damage mechanism that causes the concrete to deteriorate. Another reason that affects the rate at which chlorides move through the pore structure of a cover is the diffusion coefficient, which is the rate determining parameter that linearly affects the movement of the chlorides through the concrete cover. The paper reflects the issues that are point of discussion of the RILEM TC 270-CIM which is on “Benchmarking Chloride Ingress Models on Real-life Case Studies: Theory and Practice”, and is currently active with the aim to develop a STAR and recommendation on chloride ingress modelling
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