Glassfiber-textiles as reinforcement for concrete structures: bending and tensile tests: Fid-Bau Portal

Glassfiber-textiles as reinforcement for concrete structures: bending and tensile tests

Hegger, J. / Döinghaus, P.

The latest developments in the manufacture of textile structures offer the possibility to position the glass fibre reinforcement in the exact way regarding the flux of forces in the composite element. This leads to the following advantages of Textile Reinforced Concrete (TRC) against short fibre and steel reinforced structures. More load capacity, better exploitation of the fibres, less thickness, and positive influence on the crack formation. Different test programs such as 4-point-bending-test and tensile tests were described. In the tests the exploitation of the theoretically possible glass fibre stresses, the ductility, the influence of the amount of reinforcement, the bond between fibres and concrete, the influence of the fibres' angles relative to the direction of flux of force, and the interaction between short fibres and textiles were determined. The used textiles were multi-axial layer fabric (WIMAG S3). The load-deflection-curves of different profiles were investigated. An U-profile that was unloaded and again reloaded showed a delayed elastic behaviour. There is a linear dependence between load and initial cracking stress as well as between load and ultimate strength. In general, the textile reinforcement has a positive influence on the crack formation. Both crack width and crack distribution can be optimised. The measured crack widths were less than 0.1 mm. The combination of textiles with short fibres can improve this effect. The advantages of textiles as reinforcement in concrete such as exact positioning, very thin components, reduced weight, application of 3D textiles etc. are discussed. Such structures can be used for integrated frameworks, tubes, facade panels, noise control walls, fire protection elements etc.