Details
| Originalsprache | Englisch |
|---|---|
| Seiten (von - bis) | 698-704 |
| Seitenumfang | 7 |
| Fachzeitschrift | ce/papers |
| Jahrgang | 6 |
| Ausgabenummer | 6 |
| Publikationsstatus | Veröffentlicht - 6 Dez. 2023 |
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in: ce/papers, Jahrgang 6, Nr. 6, 06.12.2023, S. 698-704.
Publikation: Beitrag in Fachzeitschrift › Konferenzaufsatz in Fachzeitschrift › Forschung › Peer-Review
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TY - JOUR
T1 - Mechanisms of thixotropy in cement suspensions considering influences from shear history and hydration
AU - Link, Julian
AU - Strybny, Bastian
AU - Divoux, Thibaut
AU - Sowoidnich, Thomas
AU - Coenen, Max
AU - Gstöhl, Stefan
AU - Schlepütz, Christian M.
AU - Zuber, Marcus
AU - Hellmann, Steffen
AU - Rößler, Christiane
AU - Lützenkirchen, Johannes
AU - Heberling, Frank
AU - Manneville, Sébastien
AU - Schäfer, Thorsten
AU - Ludwig, Horst-Michael
AU - Haist, Michael
PY - 2023/12/6
Y1 - 2023/12/6
N2 - Abstract The 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.
AB - Abstract The 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.
KW - Rheology
KW - Thixotropy
KW - Cement suspension
KW - Hydration
KW - Rheo-Tomography
KW - Shear banding
U2 - 10.1002/cepa.2810
DO - 10.1002/cepa.2810
M3 - Conference article
VL - 6
SP - 698
EP - 704
JO - ce/papers
JF - ce/papers
SN - 2509-7075
IS - 6
ER -