An overview of Krk Bridge repairs

摘要

Krk Bridge is still the biggest reinforced concrete arch bridge with the longest concrete arch span in the world (390 m) and in spite of the designed concrete cover of only 2.5 cm is still, after 30 years of use in a very aggressive marine environment, in good condition. The paper is trying to explain it by the description of some measures undertaken during the execution and 20 years of its repair and protection. Important things in the execution were composition of concrete, specified and achieved concrete quality and in the maintenance proper testing of the concrete and reinforcement, choice of repair systems, materials and technologies of application and their optimal application in properly chosen time on properly chosen positions of the structure. Some other interested things (positive and negative) of execution, testing and repair are described as well, like slipforming of the thin and high columns, design and construction of multipurpose, complex moveable scaffolding for bridge monitoring and maintenance, sea shells attack of under water reinforced concrete foundation elements, asphalt reconstruction without surface demolition and cleaning of very thin concrete slab (11-13 cm), etc.