TY - CONF A1 - Arndt, Ralf A1 - Maierhofer, Christiane A1 - Röllig, Mathias A1 - Weritz, Friederike A1 - Wiggenhauser, Herbert T1 - Structural investigation of concrete and masonry structures behind plaster by means of pulse phase thermography T2 - Proceedings of the 7th International Conference on Quantitative Infrared Thermography (QIRT 2004) T2 - 7th International Conference on Quantitative Infrared Thermography (QIRT 2004) CY - Rhode-St-Genese, Belgien DA - 2004-06-05 KW - Pulse phase thermography KW - Nondestructive testing in civil engineering KW - Plaster KW - Concrete KW - Masonry KW - Delaminations KW - Voids PY - 2004 SP - I.3.1 EP - I.3.6 PB - Karman Institute for Fluid Dynamics CY - Rhode-St-Genese AN - OPUS4-4397 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Weritz, Friederike A1 - Arndt, Ralf A1 - Röllig, Mathias A1 - Maierhofer, Christiane A1 - Wiggenhauser, Herbert T1 - Investigation of concrete structures with pulse phase thermography JF - Materials and structures N2 - The applicability of pulse phase thermography (PPT) for the investigation of structures is studied systematically on concrete test specimens and on a plastered sandstone column. In the test specimens, voids and delaminations are implemented in different depths and with different sizes, modelling real voids, honeycombing and debonding. Delaminations of plaster in concrete and masonry and behind tiles on concrete are investigated. PPT is based on the frequency analysis of the cooling down process of actively heated surfaces. Therefore, it is contactless and thus completely non-destructive (if overheating of the surface is prevented), fast and allows the inspection of large surface areas. The interpretation of amplitude and phase images gives semi-quantitative information about the observed defects. The phase images provide a deeper probing up to 10–15 cm in relation to the interpretation of the thermograms and to the amplitude images. In addition, the influence of surface inhomogeneities and non-uniform heating is reduced. KW - Pulse phase thermography KW - Impulse thermography KW - Concrete KW - Voids KW - Honeycombing PY - 2005 DO - https://doi.org/10.1007/BF02481657 SN - 1359-5997 SN - 1871-6873 VL - 38 IS - 9 SP - 843 EP - 849 PB - Springer CY - Dordrecht AN - OPUS4-12300 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -