Print Email Facebook Twitter The Effect of Material Fresh Properties and Process Parameters on Buildability and Interlayer Adhesion of 3D Printed Concrete Title The Effect of Material Fresh Properties and Process Parameters on Buildability and Interlayer Adhesion of 3D Printed Concrete Author Panda, Biranchi (Nanyang Technological University) Noor Mohamed, Nisar Ahamed (Nanyang Technological University) Chandra Paul, Suvash (Monash University Malaysia; Nanyang Technological University) Bhagath Singh, GVP (Swiss Federal Institute of Technology) Tan, Ming Jen (Nanyang Technological University) Šavija, B. (TU Delft Materials and Environment) Date 2019 Abstract The advent of digital concrete fabrication calls for advancing our understanding of the interaction of 3D printing with material rheology and print parameters, in addition to developing new measurement and control techniques. Thixotropy is the main challenge associated with printable material, which offers high yield strength and low viscosity. The higher the thixotropy, the better the shape stability and the higher buildability. However, exceeding a minimum value of thixotropy can cause high extrusion pressure and poor interface bond strength if the printing parameters are not optimized to the part design. This paper aims to investigate the effects of both material and process parameters on the buildability and inter-layer adhesion properties of 3D printed cementitious materials, produced with different thixotropy and print head standoff distances. Nano particles are used to increase the thixotropy and, in this context, a lower standoff distance is found to be useful for improving the bond strength. The low viscosity “control” sample is unaffected by the variation in standoff distances, which is attributed to its flowability and low yield stress characteristics that lead to strong interfacial bonding. This is supported by our microscopic observations. Subject 3D concrete printingBond strengthProcess parametersThixotropy To reference this document use: http://resolver.tudelft.nl/uuid:62518d75-2ede-4d68-b947-d508a8f4f521 DOI https://doi.org/10.3390/ma12132149 ISSN 1996-1944 Source Materials, 12 (13) Part of collection Institutional Repository Document type journal article Rights © 2019 Biranchi Panda, Nisar Ahamed Noor Mohamed, Suvash Chandra Paul, GVP Bhagath Singh, Ming Jen Tan, B. Šavija Files PDF Panda_2019_The_Effect_of_ ... ncrete.pdf 5.47 MB Close viewer /islandora/object/uuid:62518d75-2ede-4d68-b947-d508a8f4f521/datastream/OBJ/view