Stability of single phase C3A hydrates against pressurized CO2
| Autor: | Johann Plank, N.P. Ivleva, M. Zhang-Preße, R. Niessner |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Ettringite
Chemistry Carbonation 0211 other engineering and technologies Mineralogy Infrared spectroscopy 02 engineering and technology Building and Construction 021001 nanoscience & nanotechnology Raman microspectroscopy chemistry.chemical_compound Phase (matter) 021105 building & construction General Materials Science Single phase 0210 nano-technology Hydrate Civil and Structural Engineering Nuclear chemistry |
| Zdroj: | Construction and Building Materials. 122:426-434 |
| ISSN: | 0950-0618 |
| DOI: | 10.1016/j.conbuildmat.2016.06.042 |
| Popis: | The stability of single phase C 3 A hydrates including ettringite, monosulfoaluminate, C 2 AH 8 , C 4 AH 13 and katoite (C 3 AH 6 ) against pressurized CO 2 was investigated performed at 20 °C or 50 °C under 7 bar CO 2 for 1–30 days. Raman microspectroscopy, X-ray diffraction, infrared spectroscopy and SEM were utilized to analyze the carbonation products. Ettringite rapidly reacted with CO 2 into gypsum, CaCO 3 and Al(OH) 3 while monosulfoaluminate started to decompose after 15 days into [Ca 2 Al(OH 6 )] 2 (SO 4 ) 1−x (CO 3 ) x -LDH. C 2 AH 8 , and C 4 AH 13 were less stable than monosulfoaluminate whereas katoite remained unchanged even after 30 days of CO 2 exposure and presented the most stable hydrate phase of C 3 A. |
| Databáze: | OpenAIRE |
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