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Is freeze-drying an alternative to solvent exchange for the hydration stop of cementitious suspensions?
Publikationstyp
Journal Article
Date Issued
2022-09
Sprache
English
Author(s)
Lübkemann, Franziska
Mundstock, Alexander
Lohaus, Ludger
Haist, Michael
Caro, Jürgen
Bigall, Nadja C.
Journal
Volume
159
Citation
Cement and Concrete Research 159: (2022-09)
Publisher DOI
Publisher
Elsevier BV
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.
Subjects
Hydration stop
Time-variant analysis
Cementitious suspension
Freeze-drying
DDC Class
540: Chemistry