Discrete Element Simulations of Rheological Response of Cementitious Binders as Applied to 3D Printing
- 1.5k Downloads
This paper aims to model the extrusion-based 3D printing process of a plain ordinary Portland cement (OPC) paste using the discrete element method (DEM), and outlines the methodology adopted to evaluate the linkage between particle scale processes and extrusion process. A mini slump test is used to define the rheological model to be used in DEM, and extract the relevant parameters. They are then implemented in a scaled-down extrusion printing model to determine the influence of particle-scale effects on extrusion force. The DEM model is able to capture the differences in extrusion load-displacement responses similar to the experiments. Refinements to the model based on extracted parameters are also discussed.
KeywordsPlain Ordinary Portland Cement Extrusion Force Discrete Element Method (DEM) Slump Test Mini-slump Cone
The authors sincerely acknowledge support from National Science Foundation (CMMI: 1353170) towards the conduct of this study.
- 9.Nair, S.A.O., Alghamdi, H., Arora, A., Mehdipour, I., Sant, G., Neithalath, N.: Microstructural packing, rheology, and ram extrusion characteristics of 3D-printable cementitious binders. Cem. Concr. Res. (Submitted)Google Scholar
- 11.Ness, C., Ooi, J.Y., Sun, J., Marigo, M., McGuire, P., Xu, H., Stitt, H.: Linking particle properties to paste extrusion flow characteristics using discrete element simulations, ArXiv Prepr. 160806188. (2016)Google Scholar
- 16.Zelelew, H.M.: Simulation of the permanent deformation of asphalt concrete mixtures using discrete element method (DEM). Washington State University (2008)Google Scholar
- 17.Cundall, P.A.: PFC user manual. Itasca Consulting Group, Inc., Mineapolis (2004)Google Scholar