Back to Search
Start Over
Geopolymerization of class C fly ash: Reaction kinetics, microstructure properties and compressive strength of early age
- Source :
- Journal of Non-Crystalline Solids. 553:120519
- Publication Year :
- 2021
- Publisher :
- Elsevier BV, 2021.
-
Abstract
- The main objective in this study is to elucidate the geopolymerization of Class C fly ash at different solid-to-liquid ratio (1.0-3.0) by using heat evolution analysis. Differential Scanning Calorimeter was used to monitor heat evolution. The calculated heat evolved was utilized to analyze the reaction kinetics using Johnson-Mehl-Avrami-Kolmogrov Model and correlate with the compressive strength and microstructural properties encompassing morphology, functional group, phase analysis, and elemental distribution. The heat evolution was found to increase with increasing solid-to-liquid ratios. The nucleation mechanism of geopolymerization of Class C fly ash was governed by instantaneous heterogeneous nucleation with rod-like growth. Solid-to-liquid ratio of 2.5 was concluded as optimal ratio due to its great performance for strength development. Meanwhile the contribution of calcium (Ca) and iron (Fe) was confirmed due to the presence of Si-O-Ca and Si-O-Fe bonds in the functional group analysis, which was further confirmed by phase analysis and elemental distribution mapping.
- Subjects :
- 010302 applied physics
Materials science
Morphology (linguistics)
Nucleation
02 engineering and technology
Calorimetry
021001 nanoscience & nanotechnology
Condensed Matter Physics
Microstructure
01 natural sciences
Electronic, Optical and Magnetic Materials
Chemical kinetics
Differential scanning calorimetry
Compressive strength
Chemical engineering
Fly ash
0103 physical sciences
Materials Chemistry
Ceramics and Composites
0210 nano-technology
Subjects
Details
- ISSN :
- 00223093
- Volume :
- 553
- Database :
- OpenAIRE
- Journal :
- Journal of Non-Crystalline Solids
- Accession number :
- edsair.doi...........713582d268d81298fc7adfe95449e62e