Abstract: “In this paper, direct shear box test was employed for characterizing rheology of semi-solid, dough-like fresh cement-based materials tailored for extrusion. In total, five fresh cementitious mixtures, suitable for extrusion, were prepared and tested under various values of consolidation pressure and their shear yield strength was obtained. The results were interpreted by Mohr-Coulomb failure envelope. Effects of fiber volume, and water content on rheological properties of the fresh cement-based materials for extrusion were investigated. It was concluded that shear box test was an effective method for characterization of rheology of semi-solid fresh cementitious composites for extrusion. Water and fibers demonstrated different influence on overall rheology of the semi-solid, dough-like fresh cementitious composites for extrusion. The research findings will help for tailoring and optimization of material formulations of cement-based materials for extrusion.”

Keywords: extrusion, fresh cement, nanoclay, rheology, semi- solid, shear