Print Email Facebook Twitter Design and analyses of printable strain hardening cementitious composites with optimized particle size distribution Title Design and analyses of printable strain hardening cementitious composites with optimized particle size distribution Author van Overmeir, A.L. (TU Delft Materials and Environment) Chaves Figueiredo, S. (Eindhoven University of Technology) Šavija, B. (TU Delft Materials and Environment) Bos, Freek P. (Eindhoven University of Technology) Schlangen, E. (TU Delft Materials and Environment) Date 2022 Abstract Since the advent of three-dimensional concrete printing (3DCP), several studies have shown the potential of strain hardening cementitious composites (SHCC) as a self-reinforcing printable mortar. However, only a few papers focus on achieving sufficient buildability when developing printable SHCC. This study investigates the role of the particle size distribution (PSD) in relation to the buildability properties of the mixture in the fresh state and strain hardening properties in the hardened state. To this end 6 mixtures were designed based on optimal particle packing with the application of the Modified Andreasen and Andersen Model. The two mix designs showed the highest displacement at maximum stress were selected for further development of their fresh state rheological properties. This was achieved by addition of a viscosity modifying agent (VMA) and a super plasticizer (SP) and through material analysis by means of ram extrusion tests. Further fresh material characterization on the final two 3DP-SHCC mix designs was attained by the deployment of uniaxial unconfined compression tests (UUCT), Vicat tests and Buildability tests. After successful printing of the two SHCC composites, the compressive strength, the 4-point bending strength and the uniaxial tensile strength and strain were determined at an age of 28 days. The research shows that optimization of the PSD in a 3DP-SHCC mix design results in an improvement of the buildability, but can introduce decreased pumpability and strain hardening capacity. Subject 3d concrete printing3DP-SHCCBuildabilityECCPumpabilityStrain hardening To reference this document use: http://resolver.tudelft.nl/uuid:227b3595-0e17-4f6e-822a-f7c24780f1ab DOI https://doi.org/10.1016/j.conbuildmat.2022.126411 ISSN 0950-0618 Source Construction and Building Materials, 324 Part of collection Institutional Repository Document type journal article Rights © 2022 A.L. van Overmeir, S. Chaves Figueiredo, B. Šavija, Freek P. Bos, E. Schlangen Files PDF 1_s2.0_S0950061822001040_main.pdf 3.72 MB Close viewer /islandora/object/uuid:227b3595-0e17-4f6e-822a-f7c24780f1ab/datastream/OBJ/view