Relating ettringite formation and rheological changes during the initial cement hydration: A comparative study applying XRD analysis, rheological measurements and modeling
Jakob C, Jansen D, Ukrainczyk N, Koenders E, Pott U, Stephan D, Neubauer J (2019)
Publication Type: Journal article
Publication year: 2019
Journal
Book Volume: 12
Article Number: 2957
Journal Issue: 18
DOI: 10.3390/ma12182957
Abstract
In order to gain a deeper understanding of the rheological development of hydrating ordinary Portland cement (OPC) pastes at initial state, and to better understand their underlying processes, quantitative X-ray diffraction (XRD) analysis and rheological measurements were conducted and their results combined. The time-dependent relation between phase development and flow behavior of cement paste was investigated at two different temperatures (20 and 30 °C), over a period of two hours. Regarding the phase development during hydration, ettringite precipitation was identified as the dominant reaction in the first two hours. For both temperatures, the increasing ettringite content turned out to correlate very well with the loss of workability of the reacting cement paste. An exponential relationship between ettringite growth and flow behavior was observed that could be explained by applying the Krieger-Dougherty equation, which describes the influence of solid fraction on the viscosity of a suspension.
Authors with CRIS profile
Cordula Jakob
Lehrstuhl für Mineralogie
Daniel Jansen
Lehrstuhl für Mineralogie
Jürgen Neubauer
Lehrstuhl für Mineralogie
Involved external institutions
Germany (DE)How to cite
APA:
Jakob, C., Jansen, D., Ukrainczyk, N., Koenders, E., Pott, U., Stephan, D., & Neubauer, J. (2019). Relating ettringite formation and rheological changes during the initial cement hydration: A comparative study applying XRD analysis, rheological measurements and modeling. Materials, 12(18). https://dx.doi.org/10.3390/ma12182957
MLA:
Jakob, Cordula, et al. "Relating ettringite formation and rheological changes during the initial cement hydration: A comparative study applying XRD analysis, rheological measurements and modeling." Materials 12.18 (2019).
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