TY - GEN A1 - Thiele, Marc T1 - Experimental investigation of damage evolution in concrete under high-cycle fatigue N2 - The current knowledge about fatigue behavior of concrete is still incomplete. This concerns especially the progress of fatigue which precedes the fatigue failure. Therefore, the process of fatigue itself under cyclic compressive loading was investigated in a systematic and comprehensive way. The aim of this investigation was to obtain a deeper insight and to provide a better understanding of the damage process occurring within the material during fatigue loading. Concrete cylinders were tested with a number of cycles to failure between 106 and 107. To investigate macroscopic and microscopic changes in the material, various methods of non-destructive and destructive testing were used. One main result was, in contrast to other authors, that the investigated changes in macroscopic material behavior could not be explained only by a development of micro-cracks. The results indicated rather, that the related changes in the fatigue behavior are mainly a result of viscous processes in the hardened cement paste, similar to the processes of creep. Based on the experimental results a description of the possible processes was derived which take place in the material structure during fatigue loading and also leads to the observed macroscopic changes in the material behavior. In this context, the results have shown that in case of isotropic material behavior a stiffness reduction related to a scalar value could not capture the damage effect on the stress-strain-relationship caused by fatigue. T2 - INFRASTAR Workshop CY - BAM, Berlin, Gemany DA - 27.03.2017 KW - Fatigue KW - Concrete KW - High-Cycle KW - Damage Evolution PY - 2017 UR - https://opus4.kobv.de/opus4-bam/frontdoor/index/index/docId/39576 AN - OPUS4-39576 AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany