Planung und Bau von großformatigen, dünnwandigen Doppelwänden aus Ultrahochleistungsbeton

Abstract

In recent years, some ground-breaking ideas and developments in concrete construction have opened new possibilities for design and construction. One of these developments is the so-called Ultra High Performance Concrete (UHPC). As a rule, concretes with a compressive strength above 150 N/mm2 are designated. However, this compressive strength can be further enhanced with special post-treatment methods. When used correctly, it is possible with UHPC to build very filigree and lightweight constructions, which are more reminiscent of steel structures than massive concrete structures. A new method for the construction of double wall systems made of ultra-high-performance concrete has been developed as a possible application area at the Vienna University of Technology at the Institute for Structural Constructions. Advantages of this type of concrete are, above all, the increased durability and the compressive strength, which are due to the high structural density. These features allow the two wall elements to be reduced to as much as 30 mm, which considerably reduces the dead weight during the construction phase, and the transport and assembly costs are also reduced. In contrast to wall elements which are produced with normal concrete and have a thickness of 50-80 mm, this reduction is an enormous difference and progress in construction. A new design method has been developed in order to solve the problems that arise in this area. The principle of functionality has been established in numerous preliminary investigations. The problem was the smooth surface at the inner sides of the UHPC wall panels, as well as the low anchorage depth of the connecting means. In the course of this diploma thesis, three prototypes with realistic component dimensions (1.50 mx 2.50 m) were planned and produced based on these preliminary investigations. After the prototypes were concreted, they were filled with in-situ concrete in order to carry out further investigations. During the filling, four pressure sensors were installed on the backside to measure the course of the concreting pressure. A photogrammetric measuring system (Aramis) was installed on the front of the prototypes to measure the maximum deformations of the UHPC wall panels. In this thesis, the history and the development of the UHPC are briefly discussed. Afterwards, the results of the preliminary investigations are presented and the main part of this work is the production and testing of the prototypes. Finally the future perspectives are discussed.

In recent years, some ground-breaking ideas and developments in concrete construction have opened new possibilities for design and construction. One of these developments is the so-called Ultra High Performance Concrete (UHPC). As a rule, concretes with a compressive strength above 150 N/mm2 are designated. However, this compressive strength can be further enhanced with special post-treatment methods. When used correctly, it is possible with UHPC to build very filigree and lightweight constructions, which are more reminiscent of steel structures than massive concrete structures. A new method for the construction of double wall systems made of ultra-high-performance concrete has been developed as a possible application area at the Vienna University of Technology at the Institute for Structural Constructions. Advantages of this type of concrete are, above all, the increased durability and the compressive strength, which are due to the high structural density. These features allow the two wall elements to be reduced to as much as 30 mm, which considerably reduces the dead weight during the construction phase, and the transport and assembly costs are also reduced. In contrast to wall elements which are produced with normal concrete and have a thickness