Overlay Ductal®: a durable solution for bridges retrofitting

  • Damien Jacomo (LafargeHolcim)
  • Frédéric Boudry (Walo Bertschinger AG)
  • Sébastien Bernardi (LafargeHolcim)


The Chillon Viaduct, built by prestressed box girder segmental construction, was constructed in the late 1960s. Recent examination of structural performance showed that punching of wheel loads through the deck slab is prevailing, though structural safety requirements currently can be fulfilled. Furthermore, the box girder concrete is prone to alkali silica reaction (ASR). The chosen strengthening measure is adding a layer of ultra-high performance fiber reinforced concrete (UHPFRC) additionally reinforced with steel rebars on the top surface of the deck slab, also serving as waterproofing layer. A new 45 mm (1.7 in.) Ductal® bridge deck delivers an effective response to these challenges.

Keywords: retrofit, composite structure, Ductal®, overlay, strain-hardening, thixotropic

How to Cite:

Jacomo, D., Boudry, F. & Bernardi, S., (2016) “Overlay Ductal®: a durable solution for bridges retrofitting”, International Interactive Symposium on Ultra-High Performance Concrete 1(1). doi:

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Published on
18 Jul 2016