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Author(s):	Knaute, W.; Mielke, F.; Franze, H.
Title:
Abstract:	Bei der Instandsetzung von zwei etwa 30 Jahre alten Spannbetonbrücken traten eine Reihe von Problemen auf, die einer raschen Klärung bedurften, um unter den komplizierten Randbedingungen das Vorhaben fortführen zu können. Dies betraf unter anderem sofortige Materialanalysen und Erarbeitung von Lösungen zu den Themen Abdichtung/Aus kris talli sa tionen mit etwaigen Treibreaktionen bzw. gefährdeter Betonzusammensetzung und Rissen sowie ganz besonders zu den Lagern, Betonschäden an Endquerträgern und Auflagerbänken. Ein weiterer Schwer punkt war die Instandsetzung von Spann gliedern, da Mängel bei der Endverankerung festgestellt wurden. Die nötigen Unter suchungen nebst Lösungen der Pro bleme werden dargestellt. Repair of prestressed concrete bridges with continuous failure analysis. During the reinstatement of two 30 year old pre-stressed concrete bridges a great range of problems occurred. These problems required a rapid clarification to be able to continue the project under the complicated boundary conditions. This concerned among others immediate material analyses and development of solutions to the topics sealing/crystallizations with possible expansive reactions or endangered concrete composition and cracks as well as in particular bearings, concrete damages to end transversal girders and bridge seats. A further main focus was the repair of tendons because there were detected defects at the end anchorage. The necessary investigations together with the solutions of the problems are illustrated.
Source:	Bautechnik 87 (2010), No. 11
Page/s:	717-723
Language of Publication:	German

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