Print Email Facebook Twitter An approach to develop printable strain hardening cementitious composites Title An approach to develop printable strain hardening cementitious composites Author Chaves Figueiredo, S. (TU Delft Materials and Environment) Romero Rodriguez, C. (TU Delft Materials and Environment) Ahmed, Zeeshan Y. (Eindhoven University of Technology) Bos, D. H. (Eindhoven University of Technology) Xu, Y. (TU Delft Materials and Environment) Salet, Theo M. (Eindhoven University of Technology) Copuroglu, Oguzhan (TU Delft Materials and Environment) Schlangen, E. (TU Delft Materials and Environment) Bos, Freek P. (Eindhoven University of Technology) Date 2019 Abstract New additive manufacturing methods for cementitious materials hold a high potential to increase automation in the construction industry. However, these methods require new materials to be developed that meet performance requirements related to specific characteristics of the manufacturing process. The appropriate characterization methods of these materials are still a matter of debate. This study proposes a rheology investigation to systematically develop a printable strain hardening cementitious composite mix design. Two known mixtures were employed and the influence of several parameters, such as the water-to-solid ratio, fibre volume percentage and employment of chemical admixtures, were investigated using a ram extruder and Benbow-Bridgwater equation. Through printing trials, rheology parameters as the initial bulk and shear yield stress were correlated with variables commonly employed to assess printing quality of cementitious materials. The rheology properties measured were used to predict the number of layers a developed mixture could support. Selected mixtures had their mechanical performance assessed through four-point bending, uni-axial tensile and compressive strength tests, to confirm that strain hardening behaviour was obtained. It was concluded that the presented experimental and theoretical framework are promising tools, as the bulk yield stress seems to predict buildability, while shear yield stress may indicate a threshold for pumpability. Subject 3D printingAdditive manufacturingRheologyStrain hardening To reference this document use: http://resolver.tudelft.nl/uuid:4afb3b29-9395-4fcd-bdc4-49d668c0b350 DOI https://doi.org/10.1016/j.matdes.2019.107651 ISSN 0264-1275 Source Materials & Design, 169 Part of collection Institutional Repository Document type journal article Rights © 2019 S. Chaves Figueiredo, C. Romero Rodriguez, Zeeshan Y. Ahmed, D. H. Bos, Y. Xu, Theo M. Salet, Oguzhan Copuroglu, E. Schlangen, Freek P. Bos Files PDF 1_s2.0_S0264127519300887_ ... ain_1_.pdf 5.57 MB Close viewer /islandora/object/uuid:4afb3b29-9395-4fcd-bdc4-49d668c0b350/datastream/OBJ/view