Journal
POLYMERS
Volume 14, Issue 6, Pages -Publisher
MDPI
DOI: 10.3390/polym14061140
Keywords
geopolymer; fly ash; sugarcane bagasse ash; mechanical properties; dielectric properties
Categories
Funding
- Thailand Research Fund (TRF)
- Khon Kaen University [RSA6280020]
- Research and Graduate Studies of Khon Kaen University
- Synchrotron Light Research Institute
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In this research, fly ash and sugarcane bagasse ash were effectively utilized as a construction material called geopolymer. The addition of sugarcane bagasse ash reduced the compressive strength of fly ash geopolymers, mainly due to the presence of stable and non-reactive quartz. However, if the amount of sugarcane bagasse ash was less than 10 wt.%, the impact on the characteristics and properties of fly ash geopolymers was minimal. The study also found that the addition of sugarcane bagasse ash slightly decreased the dielectric constant of the geopolymer composites due to high carbon content in the ash.
Fly ash (FA) and sugarcane bagasse ash (SCBA) are the wastes from lignite power plants and sugar industries, usually disposed of as landfills. In this research, these wastes were effectively utilized as a construction material, namely geopolymer. The effect of the SCBA (0-40 wt.%) addition to the FA geopolymers was investigated. The compressive strength of the FA geopolymers was reduced with the SCBA addition. The reduction was mainly due to the presence of the highly stable and non-reactive quartz (SiO2) phase in SCBA. The SCBA was not dissolved in the alkaline activated solution and hence did not contribute to the geopolymerization process. The unreacted SCBA particles remained in the geopolymer matrix but did not provide strength. However, if the amount of SCBA was about 10 wt.% or less, the impact on the characteristics and properties of FA geopolymers was minimal. Furthermore, this research also studied the dielectric properties of the FA geopolymer/SCBA composites. The relatively large dielectric constant (epsilon ' = 3.6 x 10(3)) was found for the pristine geopolymer. The addition of SCBA decreased the epsilon ' slightly due to high carbon content in SCBA. Nevertheless, the variation in epsilon ' was mainly controlled by the geopolymerization process to form the aluminosilicate gel structure.
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