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Open AccessArticle

Thixotropic Behavior of Reconstituted Debris-Flow Mixture

1
Department of Engineering, University of Ferrara, V. Saragat, 1, 44122 Ferrara, Italy
2
Department of Civil, Chemical, Environmental and Materials, University of Bologna, Viale Risorgimento, 2, 40136 Bologna, Italy
*
Author to whom correspondence should be addressed.
Water 2021, 13(2), 153; https://doi.org/10.3390/w13020153
Received: 17 November 2020 / Revised: 30 December 2020 / Accepted: 6 January 2021 / Published: 11 January 2021
Time-dependent rheological properties and thixotropy of reconstituted debris-flows samples taken from channel bank deposits are examined using a commercial rheometer equipped with a vane rotor geometric system. Sweep tests and creep tests were carried out involving mixtures having different grain concentrations ranging between 50% and 58%. Different initial conditions of the mixtures were considered in order to analyze the effects of aging and rejuvenation (thixotropy) over a short period of time and long period of time. Tested slurries show viscosity bifurcation, yield stress and time-dependent behavior. According to the experimental results, three different regimes were identified: a lower shear rate regime, corresponding to a shear rate lower than the critical value; an intermediate banding shear rate regime characterized by static and dynamic yield stress level; and a higher shear rate regime where the flowing debris behaves as a non-Newtonian fluid characterized by a constant steady state ultimate apparent viscosity. In any case, the initial state of the mixture and the sediment concentration affects the ultimate steady state rheology and the time-dependent (thixotropy) slurries’ behavior. View Full-Text
Keywords: thixotropy; time-dependent rheology; debris-flow thixotropy; time-dependent rheology; debris-flow
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MDPI and ACS Style

Schippa, L.; Doghieri, F.; Pellegrino, A.M.; Pavesi, E. Thixotropic Behavior of Reconstituted Debris-Flow Mixture. Water 2021, 13, 153. https://doi.org/10.3390/w13020153

AMA Style

Schippa L, Doghieri F, Pellegrino AM, Pavesi E. Thixotropic Behavior of Reconstituted Debris-Flow Mixture. Water. 2021; 13(2):153. https://doi.org/10.3390/w13020153

Chicago/Turabian Style

Schippa, Leonardo; Doghieri, Ferruccio; Pellegrino, Anna M.; Pavesi, Elisa. 2021. "Thixotropic Behavior of Reconstituted Debris-Flow Mixture" Water 13, no. 2: 153. https://doi.org/10.3390/w13020153

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