Physicochemical Study of the Self-Disintegration of Calcium Orthosilicate (β→γ) in the Presence of the C<sub>12</sub>A<sub>7</sub> Aluminate Phase
The β-γ polymorphic transition of calcium orthosilicate (C<sub>2</sub>S) is a key phenomenon in cement chemistry. During this transition, the compound expands due to structural changes and a significant reduction in its density is observed, leading to its disintegration into a powder wit...
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2021
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oai:doaj.org-article:55a3d9aa88e64d05b71925daf849e1db2021-11-11T18:02:09ZPhysicochemical Study of the Self-Disintegration of Calcium Orthosilicate (β→γ) in the Presence of the C<sub>12</sub>A<sub>7</sub> Aluminate Phase10.3390/ma142164591996-1944https://doaj.org/article/55a3d9aa88e64d05b71925daf849e1db2021-10-01T00:00:00Zhttps://www.mdpi.com/1996-1944/14/21/6459https://doaj.org/toc/1996-1944The β-γ polymorphic transition of calcium orthosilicate (C<sub>2</sub>S) is a key phenomenon in cement chemistry. During this transition, the compound expands due to structural changes and a significant reduction in its density is observed, leading to its disintegration into a powder with a very high specific surface area. Owing to this tendency of the C<sub>2</sub>S material to “self-disintegrate”, its production is energy-efficient and thus environmentally friendly. A physicochemical study of the self-disintegration process was conducted with the aim of determining how the amount of dodecacalcium hepta-aluminate (C<sub>12</sub>A<sub>7</sub>) in calcium orthosilicate (C<sub>2</sub>S) affects the temperature at which the polymorphic transi-tions from α’L-C<sub>2</sub>S to β-C<sub>2</sub>S and from β-C<sub>2</sub>S to γ-C<sub>2</sub>S undergo stabilization. The applied techniques included differential thermal analysis (DTA), calorimetry and X-ray diffraction (XRD), and they made it possible to determine what C<sub>2</sub>S/C<sub>12</sub>A<sub>7</sub> phase ratio in the samples and what cooling rate constitute the optimal conditions of the self-disintegration process. The optimal cooling rate for C<sub>2</sub>S materials with a C<sub>12</sub>A<sub>7</sub> content of up to 60 wt% was determined to be 5 K·min<sup>−1</sup>. The optimal mass ratio of C<sub>2</sub>S/C<sub>12</sub>A<sub>7</sub> was found to be 70/30, which ensures both efficient self-disintegration and desirable grain size distribution.Michał PyzalskiJarosław DąbekAnna AdamczykTomasz BrylewskiMDPI AGarticlecalcium orthosilicateself-disintegrationpolymorphic transformationTechnologyTElectrical engineering. Electronics. Nuclear engineeringTK1-9971Engineering (General). Civil engineering (General)TA1-2040MicroscopyQH201-278.5Descriptive and experimental mechanicsQC120-168.85ENMaterials, Vol 14, Iss 6459, p 6459 (2021) |
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DOAJ |
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DOAJ |
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EN |
| topic |
calcium orthosilicate self-disintegration polymorphic transformation Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85 |
| spellingShingle |
calcium orthosilicate self-disintegration polymorphic transformation Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85 Michał Pyzalski Jarosław Dąbek Anna Adamczyk Tomasz Brylewski Physicochemical Study of the Self-Disintegration of Calcium Orthosilicate (β→γ) in the Presence of the C<sub>12</sub>A<sub>7</sub> Aluminate Phase |
| description |
The β-γ polymorphic transition of calcium orthosilicate (C<sub>2</sub>S) is a key phenomenon in cement chemistry. During this transition, the compound expands due to structural changes and a significant reduction in its density is observed, leading to its disintegration into a powder with a very high specific surface area. Owing to this tendency of the C<sub>2</sub>S material to “self-disintegrate”, its production is energy-efficient and thus environmentally friendly. A physicochemical study of the self-disintegration process was conducted with the aim of determining how the amount of dodecacalcium hepta-aluminate (C<sub>12</sub>A<sub>7</sub>) in calcium orthosilicate (C<sub>2</sub>S) affects the temperature at which the polymorphic transi-tions from α’L-C<sub>2</sub>S to β-C<sub>2</sub>S and from β-C<sub>2</sub>S to γ-C<sub>2</sub>S undergo stabilization. The applied techniques included differential thermal analysis (DTA), calorimetry and X-ray diffraction (XRD), and they made it possible to determine what C<sub>2</sub>S/C<sub>12</sub>A<sub>7</sub> phase ratio in the samples and what cooling rate constitute the optimal conditions of the self-disintegration process. The optimal cooling rate for C<sub>2</sub>S materials with a C<sub>12</sub>A<sub>7</sub> content of up to 60 wt% was determined to be 5 K·min<sup>−1</sup>. The optimal mass ratio of C<sub>2</sub>S/C<sub>12</sub>A<sub>7</sub> was found to be 70/30, which ensures both efficient self-disintegration and desirable grain size distribution. |
| format |
article |
| author |
Michał Pyzalski Jarosław Dąbek Anna Adamczyk Tomasz Brylewski |
| author_facet |
Michał Pyzalski Jarosław Dąbek Anna Adamczyk Tomasz Brylewski |
| author_sort |
Michał Pyzalski |
| title |
Physicochemical Study of the Self-Disintegration of Calcium Orthosilicate (β→γ) in the Presence of the C<sub>12</sub>A<sub>7</sub> Aluminate Phase |
| title_short |
Physicochemical Study of the Self-Disintegration of Calcium Orthosilicate (β→γ) in the Presence of the C<sub>12</sub>A<sub>7</sub> Aluminate Phase |
| title_full |
Physicochemical Study of the Self-Disintegration of Calcium Orthosilicate (β→γ) in the Presence of the C<sub>12</sub>A<sub>7</sub> Aluminate Phase |
| title_fullStr |
Physicochemical Study of the Self-Disintegration of Calcium Orthosilicate (β→γ) in the Presence of the C<sub>12</sub>A<sub>7</sub> Aluminate Phase |
| title_full_unstemmed |
Physicochemical Study of the Self-Disintegration of Calcium Orthosilicate (β→γ) in the Presence of the C<sub>12</sub>A<sub>7</sub> Aluminate Phase |
| title_sort |
physicochemical study of the self-disintegration of calcium orthosilicate (β→γ) in the presence of the c<sub>12</sub>a<sub>7</sub> aluminate phase |
| publisher |
MDPI AG |
| publishDate |
2021 |
| url |
https://doaj.org/article/55a3d9aa88e64d05b71925daf849e1db |
| work_keys_str_mv |
AT michałpyzalski physicochemicalstudyoftheselfdisintegrationofcalciumorthosilicatebginthepresenceofthecsub12subasub7subaluminatephase AT jarosławdabek physicochemicalstudyoftheselfdisintegrationofcalciumorthosilicatebginthepresenceofthecsub12subasub7subaluminatephase AT annaadamczyk physicochemicalstudyoftheselfdisintegrationofcalciumorthosilicatebginthepresenceofthecsub12subasub7subaluminatephase AT tomaszbrylewski physicochemicalstudyoftheselfdisintegrationofcalciumorthosilicatebginthepresenceofthecsub12subasub7subaluminatephase |
| _version_ |
1718431941216174080 |