Jakob, Cordula ; Jansen, Daniel ; Ukrainczyk, Neven ; Koenders, Eddie ; Pott, Ursula ; Stephan, Dietmar ; Neubauer, Jürgen (2019)
Relating Ettringite Formation and Rheological Changes during the Initial Cement Hydration: A Comparative Study Applying XRD Analysis, Rheological Measurements and Modeling.
In: Materials, 12 (18)
doi: 10.3390/ma12182957
Article, Bibliographie
This is the latest version of this item.
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.
| Item Type: | Article |
|---|---|
| Erschienen: | 2019 |
| Creators: | Jakob, Cordula ; Jansen, Daniel ; Ukrainczyk, Neven ; Koenders, Eddie ; Pott, Ursula ; Stephan, Dietmar ; Neubauer, Jürgen |
| Type of entry: | Bibliographie |
| Title: | Relating Ettringite Formation and Rheological Changes during the Initial Cement Hydration: A Comparative Study Applying XRD Analysis, Rheological Measurements and Modeling |
| Language: | English |
| Date: | 2019 |
| Place of Publication: | Basel |
| Publisher: | MDPI |
| Journal or Publication Title: | Materials |
| Volume of the journal: | 12 |
| Issue Number: | 18 |
| Collation: | 12 Seiten |
| DOI: | 10.3390/ma12182957 |
| Corresponding Links: | |
| 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. |
| Uncontrolled Keywords: | hydration kinetics, rheology, ettringite formation, OPC, temperature, modeling, scanning electron microscopy (SEM) |
| Additional Information: | This article belongs to the Special Issue Modeling of Cementitious Materials and Structures |
| Classification DDC: | 600 Technology, medicine, applied sciences > 624 Civil engineering and environmental protection engineering |
| Divisions: | 13 Department of Civil and Environmental Engineering Sciences 13 Department of Civil and Environmental Engineering Sciences > Institute of Construction and Building Materials |
| Date Deposited: | 17 Jan 2024 14:32 |
| Last Modified: | 17 Jan 2024 14:32 |
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| Suche nach Titel in: | TUfind oder in Google |
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Relating Ettringite Formation and Rheological Changes during the Initial Cement Hydration: A Comparative Study Applying XRD Analysis, Rheological Measurements and Modeling. (deposited 16 Jan 2024 12:15)
- Relating Ettringite Formation and Rheological Changes during the Initial Cement Hydration: A Comparative Study Applying XRD Analysis, Rheological Measurements and Modeling. (deposited 17 Jan 2024 14:32) [Currently Displayed]
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