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Estimating rheological models using rheological parameters and coefficient of determination for hybrid fiber reinforced cementitious composites

Author(s): Mingli Cao, Wen Si and Yaqian Mao
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
Publisher: RILEM Publications SARL
Publication year:2018
Total Pages:9
Language : English

Abstract: A new hybrid fiber reinforced cementitious composites (HyFRCC) has been obtained by using macroscopic steel fiber, polyvinyl alcohol fiber, and micro calcium carbonate whiskers to enhance its mechanical properties synergistically. Presently, those rheology models which
apply to normal cement-based materials well, have been compared in rheological parameters and regression coefficient to explore the rheological properties of HyFRCC mixtures further. In this paper, Bingham model, modified Bingham model, Herschel-Bulkley model and
Casson model were respectively adopted to fit the rheological curves of the HyFRCC mixtures with the yield stress, plastic viscosity, and fit goodness serving as the effectiveness assessment parameters. The results show that the change trend of yield stress obtained from the four rheological models are always similar. The highest yield stress obtained by Herschel-Bulkley model and the Bingham model showed the highest plastic viscosity. The HyFRCC mixtures with superplasticizer showed the shear thickening while the addition of steel fiber alleviated this
behavior. Moreover, calcium carbonate whiskers can effectively improve the fitting degree of rheological model compared with polyvinyl alcohol fiber.

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

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