Abstract
The capability of processing robust Engineered Cementitious Composites (ECC) materials with consistent mechanical properties is crucial for gaining acceptance of this new construction material in various structural applications. ECC’s tensile strain-hardening behavior and magnitude of tensile strain capacity are closely associated with fiber dispersion uniformity, which determines the fiber bridging strength, complementary energy, critical flaw size and degree of multiple-crack saturation. This study investigates the correlation between the rheological parameters of ECC mortar before adding PVA fibers, dispersion of PVA fibers, and ECC composite tensile properties. The correlation between Marsh cone flow rate and plastic viscosity was established for ECC mortar, justifying the use of the Marsh cone as a simple rheology measurement and control method before fibers are added. An optimal range of Marsh cone flow rate was found that led to improved fiber dispersion uniformity and more consistent tensile strain capacity in the composite. When coupled with the micromechanics based ingredient-tailoring methodology, this rheological control approach serves as an effective ECC fresh property design guide for achieving robust ECC composite hardening properties.
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Acknowledgments
The authors would like to thank the Michigan Department of Transportation and the U.S. National Science Foundation MUSES (Materials Use: Science, Engineering, and Society) Grant (CMS-0223971) and Metamorphix Global, Inc. for partially funding this research. The authors would also like to thank Professor Shuichi Takayama and Dr. Hao Chen at the University of Michigan Department of Biomedical Engineering for their helpful discussions on florescence microscopy.
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Li, M., Li, V.C. Rheology, fiber dispersion, and robust properties of Engineered Cementitious Composites. Mater Struct 46, 405–420 (2013). https://doi.org/10.1617/s11527-012-9909-z
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DOI: https://doi.org/10.1617/s11527-012-9909-z