This paper is published on the occasion of the 65th birthday of Prof. Dr.‐Ing. Ludger Lohaus, Director of the Institute of Building Materials Science, Leibniz University Hannover, and coordinator of the SPP 2020 offering congratulations. Concrete specimens that are submerged in water have a significantly lower fatigue resistance than those that are stored and tested in air. This phenomenon was recognized in the past, but it is still unknown how the moisture content in the microstructure of the concrete influences its resistance against fatigue deterioration. Hence, within the Priority Program SPP 2020 “Cyclic deterioration of High‐Performance Concrete in an experimental virtual lab”, the influence of different moisture contents in the microstructure and the influence of water as an environment on the fatigue resistance of a high‐strength concrete are investigated at the Institute of Building Materials Science, Leibniz University Hannover. This project focuses especially on additional water‐induced damage mechanisms involved in the degradation process. This paper presents results of fatigue tests on high‐strength concrete specimens with different moisture contents tested in air and underwater. The results of the fatigue tests are analyzed regarding the numbers of cycles to failure and selected damage indicators, such as stiffness development and acoustic emission activity.
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Tomann et al. (2019) studied this question.
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