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Condition assessment of structures reveals information of the inner structure and its condition. To be insightful the testing task has to be defined regarding the target state defined by the customer. Questions such as “What method should be applied?”, “Where should be measured at what time?” and “How many measurements are sufficient?” have to be answered to guarantee reliable results. Often it is obvious that the additional use of non-destructive methods makes sense. But what method is the most appropriate and what strategy should be applied? This contribution will help to develop a strategy to achieve reliable results. Reliable results have to be accurate which means that reliable results have to be true and precise. According to the GUM (Guideline to the expression of Uncertainty in Measurement) the procedure how to evaluate data statistically will be demonstrated. Furthermore, it will be shown how statistically evaluated data can be used in static calculations to furnish the proof of the stability of the real as-built structure. This profoundly use of data contributes to make good and reliable decisions. 1 Condition Assessment for maintenance of infrastructure Condition assessment reveals information of the inner structure, e.g. geometry, reinforcement ratio, number and depth of tendon ducts, as well as of its condition in terms of corrosion, compaction of the concrete or grouting of the ducts. But to be revealing appropriate methods have to be chosen and to be performed in a well-thought-out strategy. Table 1 demonstrates a list of the most useful methods (e.g. [1], [2]) divided in visual inspection, study of documents, invasive methods, non-destructive methods (NDT) and further methods using the gained knowledge. Table 1 is not a complete list of appropriate methods but it presents the method (e.g. rebound hammer) in the context of the testing task (e.g. concrete compressive strength). Applying a certain method not always indicates the testing task. In case of potential mapping, it is not clear that the testing task is fulfilled just by localisation of corrosion active areas. It may also include delivering the plan for concrete removal. Thus, client and service provider should take time to define the testing task precisely to avoid misunderstandings. It is also obvious that only the availability of a method will not guarantee solving the testing task – a strategy has to be developed. Fig. 2 gives four simple – probably not complete – questions that could help to develop an effective strategy. The testing task can be very complex and will be defined by the material(s), structure, damage causes, exposition class, time of exposition etc. Table 1. List of methods for condition assessment.

Condition assessment: From good choice of methods to reliable results that meet the customer demand