Prestressed Sandwich Beams with UHPC Layers

  • Martin Classen (RWTH Aachen University)
  • Alexander Stark (RWTH Aachen University)


Sandwich panels with concrete facings and non-metallic reinforcement can fulfill the requirements of sustainable and durable building envelopes. The application of UHPC (ultra-high performance concrete) with high strengths results in a reduction in concrete usage and the realization of thin concrete layers. An additional prestressing with non-corrosive, high-strength CFRP (carbon fiber reinforced polymers) reinforcement enables long spans. In combination with a core of polymeric rigid foam, an enhanced load-bearing capacity of sandwich panels can be reached providing a low weight. In general, sandwich panels with concrete facings are assembled by cutting slabstock foams, which results in fine dust covering the cutting edges and thus harming the bond quality to the concrete facings. In addition air inclusions may occur during concreting the sandwich panels. In order to overcome these issues, i.e. to achieve a homogenous bond quality, the core made of polyurethane (PU) is foamed in pack between hardened concrete layers. This paper reports on the flexural load-bearing behavior of prestressed sandwich beams with CFRP reinforcement and foamed core.

Keywords: UHPC, prestressed concrete, experimental testing, sandwich construction, CFRP

How to Cite:

Classen, M. & Stark, A., (2016) “Prestressed Sandwich Beams with UHPC Layers”, International Interactive Symposium on Ultra-High Performance Concrete 1(1). doi:

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Published on
18 Jul 2016