TY - CONF A1 - Bäßler, Ralph A1 - Burkert, Andreas A1 - Eich, Gerd T1 - Use of Multiring-Electrodes for Humidity Measurements in Reinforced Concrete Blocks T2 - Corrosion 2004 T2 - Corrosion 2004 ; 59th NACExpo 2004 ; 59th Annual conference & exposition. NACE International - The Corrosion Society CY - New Orleans, LA, USA DA - 2004-03-28 PY - 2004 IS - Paper 04426 PB - NACE International CY - New Orleans, La. AN - OPUS4-2600 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Bäßler, Ralph A1 - Burkert, Andreas A1 - Eich, Gerd T1 - Integrated Protection System for Chloride Deteriorated Concrete Structures T2 - Corrosion 2004 T2 - Corrosion 2004 ; 59th NACExpo 2004 ; 59th Annual conference & exposition. NACE International - The Corrosion Society CY - New Orleans, LA, USA DA - 2004-03-28 KW - Chloride Induced Corrosion KW - Thermal-Sprayed Zinc KW - Moisture Content KW - Embedded Sensors PY - 2004 PB - NACE International CY - New Orleans, La. AN - OPUS4-2601 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Mietz, Jürgen A1 - Burkert, Andreas A1 - Eich, Gerd A1 - Raupach, M. T1 - Development of a new combined corrosion protection system for chloride-contaminated reinforced concrete structures JF - Materials and corrosion N2 - Chloride-induced damage of reinforcing steel is especially for parking garages and bridges often very severe as large amounts of chlorides act on horizontal surfaces which could lead to fast ingress of these detrimental ions up to the level of the reinforcement and subsequently to high rates of corrosion. In order to avoid the disadvantages of conventional rehabilitation (unreliable prognosis with patch repair or high costs and regular maintenance with cathodic protection using impressed current) a new combined protection system was developed where the principle of drying out the concrete (by means of a surface protection system) is combined with a temporary cathodic protection (by means of a sprayed zinc layer) during the transitional period of the drying out process. This new system was tested both in the laboratory and on-site at a pilot application. Based on the results obtained the possibilities and limitations of the new system are discussed in this paper. KW - Chlorid-induced corrosion KW - Reinforcing steel KW - Cathodic protection KW - Sprayed zinc layer KW - Surface protection system PY - 2005 DO - https://doi.org/10.1002/maco.200403836 SN - 0947-5117 SN - 1521-4176 VL - 56 IS - 2 SP - 104 EP - 110 PB - Wiley-VCH Verl. CY - Weinheim AN - OPUS4-7157 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Mietz, Jürgen A1 - Burkert, Andreas A1 - Burkert, Annette A1 - Eich, Gerd T1 - Long-term Behaviour of Corrosion Protection Materials for Prestressed Systems T2 - 24th IMAC - International Modal Analysis Conference (Proceedings) T2 - 2nd International fib Congress CY - Naples, Italy DA - 2006-06-05 KW - Prestressed systems KW - Corrosion protection KW - Wax KW - Grease KW - Electrochemical tests PY - 2006 SN - 0-912053-94-1 SP - 12 pages PB - Society for Experimental Mechanics CY - St. Lous AN - OPUS4-12513 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Mietz, Jürgen A1 - Burkert, Annette A1 - Burkert, Andreas A1 - Eich, Gerd T1 - Investigations on the protection effect of filling materials for post-tensioning systems under construction conditions JF - Materials and corrosion N2 - About the long-term protection behaviour of corrosion protection materials (filling materials) for prestressed systems under critical environmental conditions is only little known. The corrosion protection effect is usually based on theoretical considerations and is proven by short-term tests. The selection of the different products is mainly made according to economical or workability criteria. In a research project the barrier effect of different commercial corrosion protection materials (waxes as well as oil-based greases) against water, their tendency for undercutting as well as their additional corrosion protection effect were investigated. The exposure tests were carried out with non-stressed as well as stressed prestressing steel specimens which were subjected to critical conditions (condensed water, artificial soil solution, direct soil contact). Parallel to these long-term exposure tests the applicability of different electrochemical techniques and their significance with respect to testing the corrosion protection ability and water absorption was evaluated. Within the project a suitable method for simple testing the performance of corrosion protection materials under real conditions was developed. By means of a small compact cell submicroscopical reactions of the used sensors could be measured. The high sensitivity of this measuring technique enables the detection of degradation processes at thin protection layers. KW - Prestressed systems KW - Corrosion KW - Corrosion protection KW - Electrochemical tests KW - Grease KW - Wax PY - 2006 DO - https://doi.org/10.1002/maco.200603986 SN - 0947-5117 SN - 1521-4176 VL - 57 IS - 11 SP - 843 EP - 851 PB - Wiley-VCH Verl. CY - Weinheim AN - OPUS4-13931 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Bäßler, Ralph A1 - Burkert, Andreas A1 - Eich, Gerd T1 - Portable Equipment for Determination of Corrosion Stage of Concrete Structures - Comparison of Laboratory and On-Site Experiences T2 - Western States Corrosion Seminar - 40th T2 - Western States Corrosion Seminar : 40th CY - San Diego, CA, USA DA - 2006-03-12 KW - Galvanostatic Pulse KW - Reinforcement Corrosion KW - Corrosion Rate PY - 2006 SP - 06407\1 EP - 06407\11 PB - NACE CY - Houston AN - OPUS4-12151 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Mietz, Jürgen A1 - Burkert, Andreas A1 - Lehmann, Jens A1 - Burkert, Annette A1 - Eich, Gerd T1 - Galvanised constructional elements in contact with prestressing steel tendons JF - Materials and corrosion N2 - In order to clarify under which practical conditions real risks for hydrogen-induced stress corrosion cracking of prestressing steels exist laboratory investigations in aqueous solutions and concrete as well as tests with stressed prestressing steels were carried out. While different distances between steel and zinc (cathode and anode) showed only a negligible influence on the polarisation of the steel a significant dependence on the area ratio steel/zinc was observed. A critical area ratio of 10:1 can be defined above which polarisation of the steel to hydrogen evolution potentials is unlikely. The results obtained in the laboratory concerning the critical area ratio were confirmed by on-site investigations in a precasting plant. Exposure tests with hydrogen loading did not lead to fractures during the testing time for approved prestressing steels. The characteristic mechanical values determined immediately after the hydrogen loading tests did not show significant changes. Thus, an indirect contact between prestressing steels and galvanised elements can be estimated as uncritical. But a direct contact has to be excluded by compliance with DIN 1045-1, i.e minimal distance of 2 cm between prestressing steel and galvanised elements. PY - 2008 DO - https://doi.org/10.1002/maco.200804114 SN - 0947-5117 SN - 1521-4176 VL - 59 IS - 2 SP - 131 EP - 138 PB - Wiley-VCH Verl. CY - Weinheim AN - OPUS4-16724 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Bäßler, Ralph A1 - Burkert, Andreas A1 - Lehmann, Jens A1 - Burkert, Annette A1 - Eich, Gerd A1 - Mietz, Jürgen T1 - Galvanized constructional elements in contact with prestressing steel tendons T2 - 22nd International Galvanizing Conference - Intergalva (Proceedings) T2 - 22nd International Galvanizing Conference CY - Madrid, Spain DA - 2009-06-08 KW - Prestressed concrete KW - Prestressing steel KW - Hydrogen-induced stress corrosion cracking KW - Galvanized construction elements PY - 2009 SP - 1 EP - 11 AN - OPUS4-20700 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -