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P. Preinstorfer, J. Kollegger:
"A new construction method for double wall elements made of UHPC";
Talk: fib Symposium 2016, Cape Town; 2016-11-21 - 2016-11-23; in: "Performance-based approaches for concrete structures", (2016), ISBN: 978-2-88394-120-5; 395 - 396.

Ultra high performance concrete (UHPC) is characterised by a high strength and a high density. Taking this positive attributes into mind, it is possible to reduce the wall thicknesses of prefabricated double-wall elements to a minimum. A disadvantage of these high performance materials for the described application is the smooth surface of the hardened concrete. As a result, the bond between the prefabricated elements and the cast-in-situ concrete is insufficient. Therefore a new construction method has been developed at TU Wien. Thanks to the arrangement of a reinforcement mesh protruding from the precast concrete and embedded in the cast-in-place concrete, it is possible to achieve an artificial interlock ensuring a monolithic structure. The theoretical background of this new construction method is described in this paper. To verify the positive effects of the new construction method, different tests have been carried out at the laboratory of the Institute, including shear transfer tests and bending test of thin walled UHPC-plates with an added layer of cast-in-situ concrete on the top. This paper contains a detailed description of the test specimens and experimental procedure, as well as the test results. By using the new method of construction for the production of double-wall elements a rigid connection in the bonded interface can be confirmed.

double-wall element, high performance materials, bond behaviour