Textile reinforced concrete for formwork elements: Fid-Bau Portal

Textile reinforced concrete for formwork elements

Brameshuber, W. / Brockmann, J. / Rößler, G. / Hegger, J. / Molter, M. / Wulfhorst, B. / Schneider, M.

A further advantage of formwork integrated in the construction member is, that the stripped surface does not require any subsequent treatment. This shows advantages especially in the case of high room heights, where considerable costs are invented due to a necessary post-treatment of the ceiling. The investigations carried out proved the load bearing capacity and serviceability of the formwork element consisting of textile reinforced concrete. The ultimate loads observed varied between 9 kN and 17.7 kN depending on the material combination used. This correlates to safety margins between 1.26 and 2.42. The best material combination for the formwork element was found by combining concrete B.1 with warp knit 2. This combination leads to a high maximum load bearing capacity in combination with the smallest deflection. Further the investigations carried out within this project showed the influence of different concretes and textiles on the behaviour of tensile test specimens on the one side and on the behaviour of the formwork element on the other side. The results obtained from the tensile tests offer the possibility to improve the design process and in parallel it showed differences of this new building material compared to conventional construction members. The investigations on the formwork elements also showed different influences of the textile/concrete-interactions, which are not comparable to conventional building materials, for example the influence of the consistency of the fresh concrete. Based on the results obtained in this project further activities are planned towards the investigation of the interaction between the framework element and the site concrete. Especially the composite behaviour shall be analysed in detail. Another important aim for further investigations is the realisation and optimisation of the continuos, industrial production process of similar formwork elements.