Fresh Cement as a Frictional Non-Brownian Suspension
| Autor: | Richards, James A., Li, Hao, O'Neill, Rory E., Laidlaw, Fraser H. J., Royer, John R. |
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| Rok vydání: | 2024 |
| Předmět: | |
| Zdroj: | Powder Technology 441 (2024) 119791 |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1016/j.powtec.2024.119791 |
| Popis: | Cement is an essential construction material due to its ability to flow before later setting, however the rheological properties must be tightly controlled. Despite this, much understanding remains empirical. Using a combination of continuous and oscillatory shear flow, we compare fresh Portland cement suspensions to previous measurements on model non-Brownian suspensions to gain a micro-physical understanding. Comparing steady and small-amplitude oscillatory shear, we reveal two distinct jamming concentrations, $\phi_{\mu}$ and $\phi_{\rm rcp}$, where the respective yield stresses diverge. As in model suspensions, the steady-shear jamming point is notably below the oscillatory jamming point, $\phi_{\mu} < \phi_{\rm rcp}$, suggesting that it is tied to frictional particle contacts. These results indicate that recently established models for the rheology of frictional, adhesive non-Brownian suspensions can be applied to fresh cement pastes, offering a new framework to understand the role of additives and fillers. Such micro-physical understanding can guide formulation changes to improve performance and reduce environmental impact. Comment: 10 pages, 8 figures |
| Databáze: | arXiv |
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