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Experiences with hydrophobic impregnations in repair-measures

Author(s): Angelika Schießl-Pecka, Christoph Gehlen
Paper category: Proceedings
Book title: Proceedings on International RILEM Conference on Materials, Systems and Structures in Civil Engineering Conference segment on Moisture in Materials and Structures
Editor(s): Kurt Kielsgaard Hansen, Carsten Rode and Lars-Olof Nilsson
ISBN: 978-2-35158-178-0
e-ISBN: 978-2-35158-179-7
Publisher: RILEM Publications SARL
Publication year: 2016
Pages: 282 - 291
Total Pages: 10
Language : English

Abstract: Recently, a 20 year-old, highly frequented highway tunnel in South Germany was inspected. It was found that the tunnel walls already showed notable chloride contents in the splash water zone. Fortunately, reinforcement corrosion had not been detected yet. To prevent concrete removal it was decided to leave the chlorides in the concrete and to apply a surface protection system in combination with a monitoring system. Many of the commercially available and approved surface protection systems are based on epoxy. However when applying these epoxy based coating systems in tunnels, the application conditions (surface temperature, relative humidity and dew point temperature) are often difficult to meet. In order to study alternative surface protection systems, it was decided by the managing authorities (Autobahndirektion Südbayern and Federal Highway Research Institute (BASt)) to apply a hydrophobic impregnation (water repellent agent). Since water repellent agents are not foreseen as protective systems in German standards, a pilot project was launched. Different products were applied on the tunnel walls in order to study their efficiency.

Online publication : 2016
Publication type : full_text
Public price (Euros) : 0.00

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