TY - JOUR A1 - Maierhofer, Christiane A1 - Zacher, Gerhard A1 - Kohl, Christoph A1 - Wöstmann, Jens T1 - Evaluation of Radar and Complementary Echo Methods for NDT of Concrete Elements JF - Journal of nondestructive evaluation N2 - Non-destructive testing (NDT) of concrete structures plays an increasing role in civil engineering. This paper presents the results of systematic measurements carried out in the laboratory at BAM and on-site at several bridges using reconstructed and fused radar and ultrasonic echo data sets. For investigating the influence of concrete mixture, radar and ultrasonic measurements were performed at test specimens consisting of concrete mixtures with different pore content and distribution as well as with steel fibres. Further, it is demonstrated how the fusion of data sets recorded with different methods at the same structure (here: concrete bridges) enhances the information content in the fused data set. Different approaches for data fusion algorithms are discussed. The results of these investigations show the high potential of reconstruction and data fusion for the improvement and simplification of the interpretability of large data sets measured with impulse-echo methods. The presented results are based on the research project FOR384 funded by the DFG (Deutsche Forschungsgemeinschaft). KW - Radar KW - Ultrasonic KW - Data fusion KW - Pixel level KW - Evidence theory KW - Concrete KW - Bridges KW - Reinforcement KW - Pores KW - Steel fibres PY - 2008 DO - https://doi.org/10.1007/s10921-008-0030-8 SN - 0195-9298 SN - 1573-4862 VL - 27 IS - 1-3 SP - 47 EP - 57 PB - Plenum Press CY - New York, NY AN - OPUS4-17711 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -