Details
| Original language | English |
|---|---|
| Article number | 2720 |
| Journal | Materials |
| Volume | 14 |
| Issue number | 11 |
| Publication status | Published - 21 May 2021 |
Abstract
The impact of low-pressure treatment on the crystal structure, morphology, and chemical composition of ettringite, due to their major importance with respect to processability (i.a., dry-ing conditions) and to the analysis of ettringite-containing samples, is examined utilizing X-ray diffraction, thermogravimetric analysis, Raman spectroscopy, and environmental scanning electron microscopy. Synthetic ettringite was treated for various durations (5 min up to 72 h) and at two different levels of low-pressure (4.0 mbar and 60 µbar). Evaluation showed a correlation between the procedural parameters (time and pressure), the chemical composition, and the morphology of ettringite. The experiments reveal that, when exposed to 4 mbar pressure, nearly no changes occur in the ettringite’s morphology, whereas the crystals undergo swelling and slight deformations at very low pressures (60 µbar and 35.3 nbar), which is attributed to the loss of bound water and the partial transformation from ettringite to quicklime, anhydrite, and calcium aluminate. Furthermore, the strongly dehydrated ettringite shows the same morphology.
Keywords
- Chemical composition, Ettringite, Low-pressure, Morphology, Pawley fit
ASJC Scopus subject areas
- Materials Science(all)
- Physics and Astronomy(all)
- Condensed Matter Physics
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In: Materials, Vol. 14, No. 11, 2720, 21.05.2021.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Influence of low-pressure treatment on the morphological and compositional stability of microscopic ettringite
AU - Kißling, Patrick A.
AU - Lübkemann, Franziska
AU - von Bronk, Tabea
AU - Cotardo, Dario
AU - Lei, Lei
AU - Feldhoff, Armin
AU - Lohaus, Ludger
AU - Haist, Michael
AU - Bigall, Nadja C.
N1 - Funding Information: Funding: Funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation, projects BI 1708/5-1 and LO 751/26-1 in the framework of SPP 2005 priority program ‘Opus Fluidum Futurum–Rheology of reactive, multiscale, multiphase construction materials’ [41], as well as by the project BI 1708/4-1. In addition, the project leading to these results has received funding in part from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation program (grant agreement No. 714429).
PY - 2021/5/21
Y1 - 2021/5/21
N2 - The impact of low-pressure treatment on the crystal structure, morphology, and chemical composition of ettringite, due to their major importance with respect to processability (i.a., dry-ing conditions) and to the analysis of ettringite-containing samples, is examined utilizing X-ray diffraction, thermogravimetric analysis, Raman spectroscopy, and environmental scanning electron microscopy. Synthetic ettringite was treated for various durations (5 min up to 72 h) and at two different levels of low-pressure (4.0 mbar and 60 µbar). Evaluation showed a correlation between the procedural parameters (time and pressure), the chemical composition, and the morphology of ettringite. The experiments reveal that, when exposed to 4 mbar pressure, nearly no changes occur in the ettringite’s morphology, whereas the crystals undergo swelling and slight deformations at very low pressures (60 µbar and 35.3 nbar), which is attributed to the loss of bound water and the partial transformation from ettringite to quicklime, anhydrite, and calcium aluminate. Furthermore, the strongly dehydrated ettringite shows the same morphology.
AB - The impact of low-pressure treatment on the crystal structure, morphology, and chemical composition of ettringite, due to their major importance with respect to processability (i.a., dry-ing conditions) and to the analysis of ettringite-containing samples, is examined utilizing X-ray diffraction, thermogravimetric analysis, Raman spectroscopy, and environmental scanning electron microscopy. Synthetic ettringite was treated for various durations (5 min up to 72 h) and at two different levels of low-pressure (4.0 mbar and 60 µbar). Evaluation showed a correlation between the procedural parameters (time and pressure), the chemical composition, and the morphology of ettringite. The experiments reveal that, when exposed to 4 mbar pressure, nearly no changes occur in the ettringite’s morphology, whereas the crystals undergo swelling and slight deformations at very low pressures (60 µbar and 35.3 nbar), which is attributed to the loss of bound water and the partial transformation from ettringite to quicklime, anhydrite, and calcium aluminate. Furthermore, the strongly dehydrated ettringite shows the same morphology.
KW - Chemical composition
KW - Ettringite
KW - Low-pressure
KW - Morphology
KW - Pawley fit
UR - http://www.scopus.com/inward/record.url?scp=85106968026&partnerID=8YFLogxK
U2 - 10.3390/ma14112720
DO - 10.3390/ma14112720
M3 - Article
AN - SCOPUS:85106968026
VL - 14
JO - Materials
JF - Materials
SN - 1996-1944
IS - 11
M1 - 2720
ER -