Effects of Kinetic Parameters on Initial Setting Time, Microstructure and Mechanical Strength of Volcanic Ash-based Phosphate Inorganic Polymers
| Autor: | Thierry Ebenizer Pougnong, Louise Ndongo Ebongue, Jean Baenla, Antoine Elimbi, Joseph Dika Manga, Bernard Missota Priso Dickson |
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| Rok vydání: | 2021 |
| Předmět: |
010302 applied physics
Magnesium phosphate Materials science 02 engineering and technology 021001 nanoscience & nanotechnology Phosphate Microstructure 01 natural sciences Apatite Electronic Optical and Magnetic Materials chemistry.chemical_compound Compressive strength chemistry visual_art 0103 physical sciences visual_art.visual_art_medium Aluminium phosphate Brushite 0210 nano-technology Curing (chemistry) Nuclear chemistry |
| Zdroj: | Silicon. 14:3693-3705 |
| ISSN: | 1876-9918 1876-990X |
| Popis: | This study assesses the effects of curing temperatures (28 and 60 °C) and P2O5 / H2O molar ratio percentages (4 to 12 %) on initial setting time, microstructure and mechanical strength of volcanic ash-based phosphate inorganic polymers. The inorganic polymers along with the raw materials were characterized by X Ray Fluorescence (XRF), X Ray Diffraction (XRD), Fourier Transform Infra Red (FTIR) spectroscopy and Scanning Electron Microscopy (SEM). In addition, initial setting time of pastes was determined along with compressive strength and water absorption on specimens aged 28 days. The results showed that initial setting time decreases with the increase of P2O5 / H2O molar ratio percentage in the range of 126 − 20 Min (28 °C) and 20 − 10 Min (60 °C). Conversely, either at 28 or 60 °C curing, compressive strength increases with the increase of P2O5 / H2O molar ratio percentage. FTIR spectra show the presence of Ca-O and Fe-O and Al-O-P-O bonds. Dependent on curing temperature, new crystalline phases including hydroxyl apatite, brushite, sigloite, aluminium phosphate hydrate, potassium magnesium phosphate hydrate and silicon hydrogen phosphate were formed. Hence, initial setting time, microstructure and mechanical strength of volcanic ash-based phosphate inorganic polymers are P2O5 / H2O molar ratio percentage, curing temperature and chemical composition dependent. |
| Databáze: | OpenAIRE |
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