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Abstract:	Ein typisches Anwendungsfeld für gefugte Betonflächen sind Betonfahrbahnen. Diese sind hohen Beanspruchungen aus dem Verkehrsaufkommen und extremen Witterungsbedingungen ausgesetzt. Um wilde Risse aus daraus entstehenden Zwangsspannungen zu verhindern, werden in der Regel Querscheinfugen eingebracht. Diese stellen jedoch zugleich eine Schwachstelle im Beton dar, sodass eine kontinuierliche Instandhaltung und Wartung notwendig werden. Eine ökologisch und ökonomisch sinnvolle Alternative zur Erneuerung der gesamten Betondecke ist die Sanierung der Betonfahrbahn mithilfe einer fugenlosen und zugleich dünnen Deckschicht aus Carbonbeton. Eine Trennung des Verbunds zwischen Alt- und Carbonbeton im Bereich der Querscheinfuge gewährleistet die Verteilung entstehender Risse und die Reduzierung der Einzelrissbreiten durch multiple Rissbildung. Flüssigkeiten können so weniger tief in den Beton eindringen und schaden weder dem Altbeton noch der korrosionsresistenten Carbonbewehrung. Repair of concrete traffic areas with slim carbon reinforced concrete layers Concrete pavements are exposed to high loads from existing traffic volumes and extreme weather conditions. In order to prevent wild cracking caused by the resulting constraining stresses, transverse joints are usually installed. However, these are also weak points in the concrete pavement, so that continuous maintenance and upkeeping is necessary. An ecologically and economically viable alternative to renewing the entire concrete slab is to rehabilitate the concrete runway with the aid of a jointless as well as thin top layer of carbon reinforced concrete. By separating the bond between the old concrete layer and the carbon concrete layer in the area of the transverse joint, a distribution of cracks is ensured and the crack width of the individual cracks in the carbon reinforced concrete pavement is reduced by multiple crack formation. Liquids can therefore penetrate less deeply into the concrete and damage neither the old concrete layer nor the corrosion-resistant carbon reinforcement.
Source:	Beton- und Stahlbetonbau 115 (2020), No. 10
Page/s:	768-778
Language of Publication:	German

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