Details
Originalsprache | Englisch |
---|---|
Aufsatznummer | 106841 |
Fachzeitschrift | Cement and concrete research |
Jahrgang | 159 |
Frühes Online-Datum | 18 Juni 2022 |
Publikationsstatus | Veröffentlicht - Sept. 2022 |
Abstract
In order to understand the rheological properties of cementitious suspensions at early stages, among other phases, the formation of ettringite and its time-dependent influence, whether by amount or morphology, has to be examined in detail using a suitable method to stop the hydration process. It is state-of-the-art to exchange water with isopropanol, however, the water initially remains in the system possibly leading to reduced time resolution. Our group raised the question if freeze-drying or the combination of the water-isopropanol exchange with subsequent freeze-drying might be a suitable technique to achieve an almost complete hydration stop at any time. Recently, it was shown under which circumstances low-pressure characterization techniques can be employed without destroying the samples due to loss of crystal bound water. Here, by implementing these recent results, we show under which circumstances freeze-drying indeed can be employed as fast hydration stop method.
ASJC Scopus Sachgebiete
- Ingenieurwesen (insg.)
- Bauwesen
- Werkstoffwissenschaften (insg.)
- Allgemeine Materialwissenschaften
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in: Cement and concrete research, Jahrgang 159, 106841, 09.2022.
Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review
}
TY - JOUR
T1 - Is freeze-drying an alternative to solvent exchange for the hydration stop of cementitious suspensions?
AU - Kißling, Patrick A.
AU - Lübkemann, Franziska
AU - Mundstock, Alexander
AU - Lohaus, Ludger
AU - Haist, Michael
AU - Caro, Jürgen
AU - Bigall, Nadja C.
N1 - Funding Information: The study was funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) – projects BI 1708/5-1, LO 751/26-1 [77] as well as by the project BI 1708/4-1. In addition, the project leading to these results has in part received funding from the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation program (grant agreement No. 714429 ). The authors thank A. Feldhoff for access to XRD. The authors thank A. Krabbenhöft (IW) for ESEM measurements. The authors thank Heidelberger Cement AG for providing the cement during the DFG SPP 2005 priority program. The authors thank the Laboratory for Nano- and Quantum Engineering (LNQE) for support.
PY - 2022/9
Y1 - 2022/9
N2 - In order to understand the rheological properties of cementitious suspensions at early stages, among other phases, the formation of ettringite and its time-dependent influence, whether by amount or morphology, has to be examined in detail using a suitable method to stop the hydration process. It is state-of-the-art to exchange water with isopropanol, however, the water initially remains in the system possibly leading to reduced time resolution. Our group raised the question if freeze-drying or the combination of the water-isopropanol exchange with subsequent freeze-drying might be a suitable technique to achieve an almost complete hydration stop at any time. Recently, it was shown under which circumstances low-pressure characterization techniques can be employed without destroying the samples due to loss of crystal bound water. Here, by implementing these recent results, we show under which circumstances freeze-drying indeed can be employed as fast hydration stop method.
AB - In order to understand the rheological properties of cementitious suspensions at early stages, among other phases, the formation of ettringite and its time-dependent influence, whether by amount or morphology, has to be examined in detail using a suitable method to stop the hydration process. It is state-of-the-art to exchange water with isopropanol, however, the water initially remains in the system possibly leading to reduced time resolution. Our group raised the question if freeze-drying or the combination of the water-isopropanol exchange with subsequent freeze-drying might be a suitable technique to achieve an almost complete hydration stop at any time. Recently, it was shown under which circumstances low-pressure characterization techniques can be employed without destroying the samples due to loss of crystal bound water. Here, by implementing these recent results, we show under which circumstances freeze-drying indeed can be employed as fast hydration stop method.
KW - Cementitious suspension
KW - Freeze-drying
KW - Hydration stop
KW - Time-variant analysis
UR - http://www.scopus.com/inward/record.url?scp=85132746995&partnerID=8YFLogxK
U2 - 10.1016/j.cemconres.2022.106841
DO - 10.1016/j.cemconres.2022.106841
M3 - Article
AN - SCOPUS:85132746995
VL - 159
JO - Cement and concrete research
JF - Cement and concrete research
SN - 0008-8846
M1 - 106841
ER -