Surface-ready, fully completed, textile reinforced balcony slabs with integrated bearing elements
Table of contents
Project data
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Titel | Title |
Report in the yearbook 2011
Lightweight TRC Balcony Slab
Slender connection between textile reinforced slab and steel reinforced beam
The suitability of textile reinforced concrete for lightweight, material-efficient balcony floor slabs was examined by an industrial cooperation project, which was promoted by the Arbeitsgemeinschaft industrieller Forschungen (AiF). It was successfully demonstrated that, compared to the conventional steel reinforced concrete design, balcony slabs can be manufactured thinner and lighter. Special challenge of this project was to find an appropriate procedure for an industrial and economic mass production. There have also been developed computation and design methods to satisfy the required ultimate and serviceability limit state criteria.
As a result of the theoretical considerations and of five experimentally tested prototypes, the cooperative partners provided a fully functional, four point supported balcony floor slab with a peripheral edge beam and an area of 3.75 m x 1.75 m which may be presented to customers. Different reinforcing materials like reinforcing steel BSt 500, stainless steel BSt 500 NR and a carbon textile SIGRATEX Grid 600 (SGL Technologies GmbH) were applied. These different reinforcing components were assigned to different slab parts in dependence of their suitability – reinforcing steel BSt 500 to the (solid) edge beam, the carbon fabric to the slender parts of the slab and the stainless steel in the transition area between slab and edge beam to achieve optimal bond there. Additionally, a top layer made of a special coating was placed onto the slab to guarantee a durable, resistant surface. Due to the little slab thickness which varies between 4.5 and 11 cm, a slender lightweight structure was designed. The prototype of the balcony slab was concreted by a cast-and-laminate technology in a concrete plant.
The continuous improvement of the design during the prototype development led to a minimization of the manufacturing time and costs. The final economic analysis, considering further not yet integrated optimizations, showed that a textile reinforced concrete slab can compete with an equally bearable steel reinforced concrete slab.