Obtaining rheological parameters from flow test — Analytical,computational and lab test approach |
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| Affiliation: | 1. Center of Excellence for Functional Materials, Laboratory of Physical Chemistry, Åbo Akademi University, Porthansgatan 3, FI-20500 Turku, Finland;2. Kemira R&D and Technology, Luoteisrinne 2, FI-02271 Espoo, Finland;1. IFSTTAR, Laboratoire Navier, Université Paris Est, France;2. Dow Construction Chemicals, Horgen, Switzerland;1. ICI Rheocenter, Innovation Center Iceland, Arleynir 2-8, 112 Reykjavik, Iceland;2. Reykjavik University, Menntavegur 1, 101 Reykjavik, Iceland;3. Department of Civil, Architectural and Environmental Engineering, Missouri University of Science and Technology, Rolla, MO, United States |
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| Abstract: | In the mix design process of cementitious suspensions, an adequate rheology of the cement paste is crucial. A novel rheological field test device for cementitious fluids is presented here and investigated theoretically, by computer simulation and by lab tests. A simple flow stoppage test with a timed spread passage point provides accurate rheological parameters according to the Bingham material model. Values for yield stress and plastic viscosity are obtained for a test specimen of no more than 19.75 · 10? 6 m3 of fluid. This volume is equivalent to 19.75 g of water at room temperature. Such a small volume allows reliable tests even for small amounts of fillers. Promising results show that both yield stress and plastic viscosity can be determined by this simple test. This novel rheological test method also enables the correlation of different rheological equipment used by different laboratories. |
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