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Thixotropic Behavior of Reconstituted Debris-Flow Mixture

Department of Engineering, University of Ferrara, V. Saragat, 1, 44122 Ferrara, Italy
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;
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.

AMA Style

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

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.

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