Rheology Behavior of Short Fiber-Reinforced Cement-Based Extrudate
Publication: Journal of Engineering Mechanics
Volume 125, Issue 5
Abstract
It is important to understand the rheological properties of an extrudate of short fiber-reinforced cementitious (SFRC) composites to achieve a successful extrusion of SFRC composites. This paper presents the preliminary results on the study of the rheology field of SFRC extrudate. The paper started with the analysis of cementitious flows in a shallow flight extruder in which the height of the flight to the width of the channel ratio is small (H/W < 0.1). The fresh cementitious flow inside was considered as a 2D steady shear flow with nonlinear viscoelastic properties. By the fact that the Deborah number is small for the cementitious flow in an extruder, the constitutive equation of “retarded-motion-expansion” was adopted. The formula of the flow volume rate for a shallow flight screw extruder was derived and numerically solved by the finite-difference method. The velocity profiles and pressure gradient of the flow were presented. Then, a correction factor was used to modify the obtained results for the case of the deep flight screw extruder (H/W > 0.1). The differences between the results predicted by the Newtonian theory and those by the nonlinear viscoelastic theory were also investigated and analyzed.
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Published In
Journal of Engineering Mechanics
Volume 125 • Issue 5 • May 1999
Pages: 530 - 536
History
Published online: May 1, 1999
Published in print: May 1999
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