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Author(s):	Krispel, Stefan; Strommer, Werner
Title:	Tunnel inner lining of bright self-compacting concrete / Tunnelinnenschale aus hellem selbstverdichtendem Beton
Abstract:	Ever more stringent requirements have been specified in recent years for the surfaces of tunnel inner linings with regard to surface porosity (with influence on the ease of cleaning) and lightness. These requirements are normally fulfilled by filling and applying tunnel paint. Recently there have been many cases of damage to paint or coating systems, sometimes only a few weeks after opening for traffic. This often includes the separation of the coating. This flaking leads to increased dirt adhesion and thus to a reduction of lightness and irritation to the field of view of the drivers. The refurbishment work, which is often necessary, leads to traffic obstruction like hold-ups and diversions. For this reason, the durability of the surface is of great significance, and innovative solutions are also being investigated in the field of concrete technology. The following article presents an alternative and durable method of fulfilling all the requirements placed on the surface of the tunnel inner lining. In den vergangenen Jahren wurden immer höhere Anforderungen an die Oberflächen von Tunnelinnenschalen betreffend Oberflächenporosität (Einfluss auf Reinigungsfähigkeit) und Helligkeit gestellt. Zur Erfüllung dieser Anforderungen werden meist Tunnelanstriche nach vorheriger Spachtelung verwendet. In letzter Zeit traten jedoch vermehrt Schäden an Anstrichsystemen auf, teilweise schon wenige Wochen nach Verkehrsfreigabe. Hierbei kommt es oftmals zu einem Ablösen der Anstrichschicht. Diese Ablöseerscheinungen führen aufgrund einer verstärkten Schmutzablagerung zu einer Reduktion der Helligkeit und zu Irritationen des Blickfelds der Verkehrsteilnehmer. Die oftmals erforderlichen Instandsetzungsarbeiten am Beschichtungssystem führen zu Verkehrsbehinderungen wie Staus und Umleitungen. Aus diesen Gründen ist die Beständigkeit der Oberfläche von großer Bedeutung, und innovative Lösungswege werden auch im Bereich der Betontechnologie erprobt. Im nachstehenden Beitrag wird eine alternative dauerhafte Methode vorgestellt, die alle Anforderungen an die Oberfläche der Tunnelinnenschale erfüllt.
Source:	Geomechanics and Tunnelling 4 (2011), No. 1
Page/s:	55-62
Language of Publication:	English/German

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