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Relationship between rheology and fiber dispersion of FRC with different fibers

Author(s): Mingli Cao, Yaqian Mao and Wen Si
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:13
Language : English

Abstract: Fiber distribution is an important factor affecting both fresh and hardened properties of
fiber reinforced cement-based composite(FRC). Studying the relationship between rheology
properties and fiber distribution can help us get better properties of hardened FRC. In this
paper, the rheological properties and fiber distribution of FRC were studied by rotary
rheometer and inverted fluorescence microscope respectively. With different fiber type and
different fiber volume fraction, the rheological properties were investigated in fresh state
while fiber distribution in hardened state. The rheological parameters (plastic viscosity and
yield stress) and fiber distribution parameters (the number of fibers per unit area in the cross
section of the specimen, and fiber distribution coefficient) were used to evaluate the
relationship between rheological properties and fiber distribution character. The relationships
are not the same for FRC with different types of fibers. There presents positive correlation
between rheological parameters and dispersion parameters for polyvinyl alcohol fiber
reinforced cement-based composite (PVA-RC). While there is positive correlation between
plastic viscosity and fiber number, as well as curvilinear correlation between plastic viscosity
and fiber dispersion coefficient, for steel fiber reinforced cement-based composite (SF-RC). In addition, the quantitative polynomial fit can be used to quantitatively link rheological
parameters to fiber dispersion.

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

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