Dehnungsfugen und Abdichtung im Beton: SikaSwell und Waterbar
Kurzantwort: Dehnungs- und Arbeitsfugen im Beton benötigen eine spezielle Abdichtung, die dem Wasserdruck und der Bewegung des Bauwerks standhält. SikaSwell® A wird innerhalb des Betons in kalten Arbeitsfugen eingesetzt; Sika Waterbar® O ES wird ebenfalls im Beton eingebettet, jedoch in Dehnungsfugen mit dauerhafter Bewegung, etwa in Wasserbehältern und im Tiefbau.
Welches Produkt für welche Fuge
| Produkt |
Funktionsweise |
Ideal für |
| SikaSwell® A |
Profil aus Acrylpolymer, das sein Volumen bei Wasserkontakt um 50 % vergrößert und die Fuge von innen abdichtet |
Kalte Arbeitsfugen (zwischen aufeinanderfolgenden Betonagen), Rohrdurchführungen |
| Sika Waterbar® O ES |
PVC-Band mit zentralem Wulst, das beidseitig der Fuge im Beton eingebettet wird |
Dehnungsfugen mit dauerhafter Bewegung, Wasserbehälter, Tiefbau |
Wichtiger Unterschied: Arbeitsfuge vs. Dehnungsfuge
-
Arbeitsfuge (kalte Fuge): entsteht, wenn die Betonage unterbrochen und später fortgesetzt wird (z. B. zwischen Bodenplatte und Wand). Es ist keine Bewegung vorgesehen, aber es handelt sich um eine Schwachstelle gegenüber Wasser. Hier ist SikaSwell® A die richtige Wahl.
-
Dehnungsfuge: wird bewusst geplant, um die thermische oder strukturelle Bewegung des Bauwerks über seine gesamte Nutzungsdauer aufzunehmen. Dafür ist ein flexibles, eingebettetes Band wie Sika Waterbar® O ES nötig.
So werden sie eingebaut
-
SikaSwell® A wird mit Klebstoff oder Nägeln auf dem bereits erhärteten Beton befestigt, unmittelbar bevor der nächste Bauabschnitt betoniert wird, sodass es im neuen Beton eingebettet wird.
-
Sika Waterbar® O ES wird vor dem Betonieren mittig in der Schalung platziert, sodass die Hälfte des Bandes auf jeder Seite der Dehnungsfuge liegt.
Häufig gestellte Fragen
Kann ich SikaSwell A in einer Dehnungsfuge mit Bewegung verwenden?
Das ist nicht der Haupteinsatzzweck: Es ist für kalte Arbeitsfugen ohne vorgesehene Bewegung konzipiert. Für Dehnungsfugen mit dauerhafter Bewegung ist ein Waterstop-Band wie Sika Waterbar® O ES die richtige Lösung.
Was passiert, wenn SikaSwell A vor dem Betonieren nass wird?
Wenn es durch Wasser oder Regen vorzeitig aufquillt, bevor es einbetoniert wird, verliert es einen Teil seiner Abdichtungswirkung; es muss bis zum Betonieren geschützt werden.
Können beide Systeme auf derselben Baustelle kombiniert werden?
Ja, das ist üblich: SikaSwell A in kalten Arbeitsfugen und Sika Waterbar in den im Projekt geplanten Dehnungsfugen, etwa in einem Behälter oder Keller.
Siehe auch: Betonschutz und -verstärkung.
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