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Abstract
A new constructive and technological approach was developed for the efficient production of large-dimensioned, curved freeform formworks, which allows the manufacturing of single and double-curved textile reinforced concrete elements. The approach is based on a flexible, multi-layered formwork system, which consists of glass-fibre reinforced plastic (GFRP). Using the unusual structural behavior caused by anisotropy, these GFRP formwork elements permit a specific adjustment of defined curvature. The system design of the developed GFRP formwork and the concrete-lightweight-elements with stabilized spacer fabric was examined exhaustively. Prototypical curved freeform surfaces with different curvature radii were designed, numerically computed and produced. Furthermore, the fabric’s contour accuracy of the fabric was verified, and its integration was adjusted to loads. The developed textile reinforced concrete (TRC) had 3-point bending tensile strength of 41.51 MPa. Beyond that, it was ensured that the TRC had a high durability, which has been shown by the capillary suction of de-icing solution and freeze thaw test with a total amount of scaled material of 1172 g/m² and a relative dynamic E-Modulus of 100% after 28 freeze-thaw cycles.
Highlights
Research in the fields of innovative concrete structures with high potential for lightweight design, and of textile reinforcement for special applications has been object of intensive scientific and application-oriented efforts for a couple of years (Curbach & Scheerer, 2001; Brameshuber, 2006; Funke et al, 2014a)
A new constructive and technological approach was developed for the efficient production of large-dimensioned, curved freeform formworks, which allows the manufacturing of single and double-curved textile reinforced concrete elements
The approach is based on a flexible, multi-layered formwork system, which consists of glass-fibre reinforced plastic (GFRP)
Summary
Research in the fields of innovative concrete structures with high potential for lightweight design, and of textile reinforcement for special applications has been object of intensive scientific and application-oriented efforts for a couple of years (Curbach & Scheerer, 2001; Brameshuber, 2006; Funke et al, 2014a). (Curbach & Jesse, 2009) and the citations listed there) Another advantage in comparison to ordinary reinforced concrete is that corrosion can be largely excluded. A crucial technological objective of textile reinforced concrete elements is the development of complex solid preform-structures These are produced by processing flat structures through appropriate cutting (Curbach et al, 2003). Selectively deformable textile 3D-structures, for instance spacer fabric, for the reinforcement of concrete lightweight elements exist, the corresponding formwork elements are only in an early stage of development. These elements are essential for the realization of concrete shell structures that can be curved in any way
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