Mechanisms of thixotropy in cement suspensions considering influences from shear history and hydration

Author:

Link Julian1,Strybny Bastian1,Divoux Thibaut2,Sowoidnich Thomas3,Coenen Max1,Gstöhl Stefan4,Schlepütz Christian M.4,Zuber Marcus5,Hellmann Steffen6,Rößler Christiane3,Lützenkirchen Johannes5,Heberling Frank5,Manneville Sébastien2,Schäfer Thorsten6,Ludwig Horst‐Michael3,Haist Michael1

Affiliation:

1. Leibniz Universität Hannover Hannover Germany

2. ENSL, CNRS, Laboratoire de physique Lyon France

3. Bauhaus Universität Weimar Weimar Germany

4. Paul Scherrer Institut Villigen Switzerland

5. Karlsruher Institut für Technologie (KIT) Karlsruhe Germany

6. Friedrich‐Schiller‐Universität Jena Jena Germany

Abstract

AbstractThe rheological properties of fresh concrete are a direct function of the interaction behaviour of the granular inventory of the concrete (i.e., gravel, sand and cement) and especially of the colloidal fractions of cement. Under low shear stresses, agglomeration of colloidal particles is observed, while at high shear stresses, dispersion of these agglomerates occurs. Besides the agglomeration state, the formation of shear banding, zones with concentrated shear flow, is another controlling mechanism of the flow behaviour of cement suspensions. Rheological creep tests in this study are focused on investigating the influence of shear history and hydration process on thixotropy of cement suspension. In this paper, the meaning of the word thixotropy is slightly extended to additionally encompass rheological aging and hydration effects. Selected samples were analyzed by coupling a rheometer to synchrotron X‐ray tomography to gain insight into the shear‐induced microstructural changes during shear start‐up tests. The observations show heterogeneities in the velocity profile in the shear gap and the development of shear banding.

Funder

Deutsche Forschungsgemeinschaft

Publisher

Wiley

Subject

General Earth and Planetary Sciences,General Environmental Science

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