Novel sensor for non-destructive durability monitoring in reinforced concrete
- Conference Paper
Rights / licenseCreative Commons Attribution 4.0 International
Reinforced concrete is generally a durable material; however, it is also subjected to various degradation mechanisms, amongst them, corrosion of the reinforcing steel is the main one. In addition to loss in safety and serviceability, reinforcement corrosion causes high economical losses in all industrialised countries. Furthermore, costs associated with corrosion of the reinforcing steel are expected to significantly increase in the next years; this is because most of concrete structures have been long exposed to ingress of chlorides (e.g. de-icing salts, seawater) and CO2, the main aggressive agents that leads to corrosion initiation. There is currently a lack of knowledge and no data is available to determine whether the structure can be in service as this point; this forces engineers to take conservative measures, leading to the early repair of the structure. Most of concrete structures built in industrialised countries will be reaching a critical age in the next years and will have to operate beyond their service life; based on the current conservative maintenance approaches, this would lead to a strong increase in the number of structures needing repair and the corrosion costs. Thus, there is a high need to quit conservative approaches and find cost-efficiently diagnosis. In this work, we present a novel sensor to be embedded in concrete and to monitor the main parameters that lead to corrosion initiation, namely pH and chloride concentration, in combination with the relevant parameters associated with corrosion state and propagation: corrosion potential, electrical resistivity and temperature. We believe this approach will significantly improve durability monitoring in reinforced concrete; as the data obtained will provide a better insight on the corrosion state of the structure at the different locations over time. Use of this data will allow postponing repair in a safe way and optimize maintenance and planning. First results from pilot projects of embedding the sensor in engineering structures will be shown. Show more
Book titleSMAR 2019 - Fifth Conference on Smart Monitoring, Assessment and Rehabilitation of Civil Structures - Program
Pages / Article No.
Organisational unit09593 - Angst, Ueli / Angst, Ueli
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