MS 1-2: Performance Based Evaluation of Corrosion in Reinforced and Pre-Stressed Concrete Structures


Ulrich Schneck, CITec Concrete Improvement Technologies GmbH, Dresden, Germany

Ulrich Schneck    

Brochure

The aim of the symposium shall be to present current methods, approaches and opportunities for a performance based assessment of corrosion processes in reinforced and pre-stressed concrete structures. The advantages of a performance based evaluation - compared to the most commonly used prescriptive rules - are for example:

- in case of regular monitoring: early information about developing corrosion issues, about local failures in concrete quality, about deviating environment exposure and/ or chloride ingress behaviour compared to the planned material specifications, and consequently a reduced repair effort
- in case of one-time monitoring prior to concrete repair and maintenance actions: the corrosion related surface parts can be identified safely and be separated from corrosion free areas (which is usually different from the visual appearance) – this results in enhanced repair options, precise information for required quantities in tenders, and higher durability of the repair
- in case of early detected problem areas without immediate need of repair: monitoring sensors can be placed appropriately for long-term surveillance

Generally, with a deeper understanding of the corrosion processes in an individual structure, the maintenance and repair effort can be reduced and focussed on areas in need. The lifetime can be expanded, and responsible advice can be given about when, how and where to act or even to do nothing and tolerate an overall increased chloride content, because no typical macro elements and pitting corrosion can result from this situation.


 

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