A new rotation speed-torque transformation equation for Herschel-Bulkley model in wide-gap coaxial cylinders rheometer and its applications for fresh concrete

Author(s): Yu Liu, Caijun Shi, Qiang Yuan, Xiaopeng An, Dengwu Jiao, Lingli Zhu and Huang Li
Paper category: Proceedings
Book title:4th International Symposium on Design, Performance and Use of Self-Consolidating Concrete
Editor(s): Caijun Shi & Zuhua Zhang, Hunan University, China
Kamal Henri Khayat, Hunan University, China
Missouri University of Science & Technology, USA
ISBN:978-2-35158-204-6
e-ISBN:978-2-35158-205-3
Publisher: RILEM Publications SARL
Publication year:2018
Pages:237-251
Total Pages:15
Language : English

Abstract: Herschel-Bulkley model is one of the most commonly used rheological models for Non-Newtonian Fluid, and it has been used to characterize the fresh concrete in a wide gap rheometer. In the rheological test, the measured data of rotating speed and torque need to be transformed to fundamental rheological parameters. However, the equation and the approximate solution suggested in the literature are questionable. In this paper, a new integral equation is theoretically derived. Nine sets of experimental data are fitted, and parameters of the model are obtained. This analytical solution is compared with the approximate solution proposed in the literature. The result indicates that the approximate solution overestimates the shear stress at both low and high shear rate zones, and the new transformation equation for Herschel-Bulkley model in this study is validated to describe the rheological behavior of fresh
concrete.

Online publication : 2018
Publication type : full_text
Public price (Euros) : 0.00