Non-reinforced ultra-high performance concrete (UHPC)

A cover for sandwich wall panels

Multi-layer reinforced-concrete wall panels comprise a supporting and facing shell made of reinforced concrete as well as an interior insulating layer. The facing shell, which forms the façade, has a minimum thickness of 70 mm, is generally non-load-bearing and serves as a weather protection layer for the thermal insulation and as a design feature of the building. Despite having a non-load-bearing function, these façades are of solid design because the internal reinforcement must be protected against corrosion. Innovative developments in the fields of concrete engineering and anchoring technology enable slender, non-reinforced, energy-efficient and sustainable architectural concrete façades with a component thickness of merely a few centimeters to be built as the facing shell of multi-layer reinforced-concrete wall panels (Fig.). This potential presents itself through the use of ultra-high performance concretes which are characterized, for example, by their high tensile strength and flexural strength. Connectors made of glass fiber-reinforced polymer material allow multiple and hyperstatic mounting of the façade without the formation of thermal bridges. Stresses resulting from restraint action can be reduced due to the comparatively low modulus of elasticity.

In order to be able to design this system, comprehensive small-scale testing on the material, component testing on the façade system and numerical investigations are performed at TU Kaiserslautern. The investigations focus, for example, on determining structural element resistances taking into account load-bearing direction, scale effect and exposure, and on the influence of the supporting structure on the load-bearing behavior. The results will be incorporated in a design proposal that will be verified by means of component testing. Construction recommendations will be developed for the actual production process at the precast plant. The objective is to enable the use of non-reinforced UHPC in the cover of sandwich wall panels.

Related articles:

Issue 2019-02 Concrete sandwich panel

Glass-rigid foam facing without connectors

The layout of conventional precast concrete sandwich panels comprises an at least 7?cm thick reinforced concrete facing, an insulation layer, and a reinforced concrete bearing layer. Anchors made of...

Issue 2017-02 Load-bearing reinforced architectural concrete façade

The Deutsche Bank project in Berlin

Description of building and structural components This office and commercial building includes seven stories. Its load-bearing structure mainly consists of a seamlessly designed framework comprising...

Issue 2020-02 Vacuum insulation for sandwich wall panels

Load-transferring and switchable

Improving the energy efficiency of buildings is of central importance in view of rising energy prices, increasingly scarce fossil energy reserves and the continually advancing greenhouse effect....

Issue 2015-06 Philipp

     Quick construction design               thanks to Strakon with      3D ­interface

Reinforced concrete sandwich panels have become the standard in façade design for commercial buildings as well as office buildings, as they are offering almost unlimited possibilities for design in...

Issue 2018-01

Precast insulated load bearing roof element and methods of manufacturing a roof element

(10) US2017321420 (A1 (57) The present disclosure relates to a precast load bearing roof deck element for a building comprising an upper floor layer of concrete, a load bearing steel reinforced lower...