TY - CONF A1 - Algernon, Daniel A1 - Wiggenhauser, Herbert A1 - Abraham, O. T1 - Scanning impact-echo for the investigation of tendon ducts in concrete T2 - Memorandum of the Workshop of COST on NDT Assessment and New Systems in Prestressed Concrete Structures T2 - Workshop of COST on NDT Assessment and New Systems in Prestressed Concrete Structures DA - 2005-09-18 PY - 2005 SP - 55 EP - 62 AN - OPUS4-11051 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -