Potentials of Steel Fibres for Mesh Mould Elements
- 1.5k Downloads
Mesh Mould is a digital fabrication technique developed at ETH Zurich in which the reinforcement and formwork production are unified in a robotically controlled system. An industrial robot fabricates a dense, three-dimensional, double-sided, welded reinforcement mesh that is infilled with a special concrete mix that achieves sufficient compaction without flowing out the mesh, which acts as porous formwork. Since the project started in 2012, the actual generation of robot end-effector is capable of bending and welding conventional steel reinforcement of 6 and 4.5 mm in diameter. Due to the process, the load-bearing capacity of these Mesh Mould elements is not equal in both directions due to geometrical restrictions in the end-effector. This study aims to increase the load-bearing capacity in the weaker direction by using steel fibre reinforced concrete (SFRC), which orients the fibres during flowing in this direction and in addition prevents the leakage of the concrete by enhancing jamming. A total of 10 specimens with 540 × 210 × 80 mm dimensions were tested in a displacement controlled symmetric four-point bending test. By combining SFRC with a mesh, the bending strength increased significantly with respect to the samples without fibres. The capacity is higher than the capacity of the individual parts, which are evaluated in separate material tests. Nonetheless, the bending strength in this study was limited by the weld strength, which was considerably lower than the one achieved by the robot. Higher weld strength would lead to better performance than in this first study, which is a part of an ongoing research effort.
KeywordsMesh Mould Steel fibre reinforced concrete SFRC Digital reinforcement assemblies Digital construction
This paper summarizes the results of a Master thesis carried out under research supported by the National Centre for Competence in Research in Digital Fabrication – Innovative Building Processes in Architecture (project number 51NF40_141853).
- 1.Hack, N., Lauer, W., Gramazio, F., Kohler, M., Blank, N.: Method of fabricating a 3-dimensional structure, mesh formwork element for fabricating a 3-dimensional structure, and method of fabricating the same. In: Google Patents (2015)Google Scholar
- 2.Kumar, N., Hack, N., Dörfler, K., Walzer, A., Gonzalo, J. Gramazio, F., Kohler, M., Buchli, J.: Design, development and experimental assessment of a robotic end-effector for non-standard concrete applications. In: 2017 IEEE International Conference on Robotics and Automation, Singapore, pp. 1707–1713 (2017)Google Scholar
- 3.Gebhard, L.: Mesh Mould: Model Material Filling Study. Zürich (2017, unpublished)Google Scholar
- 4.Hack, N., Wangler, T., Mata-Falcón, J., Dörfler, K., Kumar, N., Walzer, A., Graser, K., Reiter, L., Richner, H., Buchli, J., Kaufmann, W., Flatt, R., Gramazio, F., Kohler, M.: Mesh Mould: an on site, robotically fabricated, functional formwork. In: 11th High Performance and 2nd Concrete Innovation Conference, Tromsø (2017)Google Scholar
- 6.DFAB HOUSE homepage. http://dfabhouse.ch/mesh_mould/. Accessed 5 Mar 2018
- 7.Mata-Falcón, J.: Mesh Mould structural tests. Zürich (2016, unpublished)Google Scholar
- 8.Pfändler, P.: Potential of steel fibre for Mesh Mould elements. Zürich (2017, unpublished)Google Scholar
- 9.DIN EN 14651: 2007 12: Prüfverfahren für Beton mit metallischen Fasern; Bestimmung der Biegezugfestigkeit (Proportionalitätsgrenze, residuelle Biegezugfestigkeit), Deutsche Fassung EN (2007)Google Scholar
- 10.Ruffray, J., Bernhard, M., Jipa, A., Meibodi, M., Montague de Taisne, N., Stutz, F., Wanglert, T., Flatt, R.J., Dillenburger, B.: Complex architectural elements from HPFRC and 3D printed sandstone. In: International Symposium on Ultra-High Performance Fibre-Reinforced Concrete UHPFRC 2017, Montpellier (2017)Google Scholar