Journal
POLYMERS
Volume 14, Issue 10, Pages -Publisher
MDPI
DOI: 10.3390/polym14101954
Keywords
fly ashes; waste incineration product; geopolymers; X-ray fluorescence; X-ray diffraction; mechanical strength
Categories
Funding
- Polish National Agency for Academic Exchange under the International Academic Partnership Programme [PPI/APM/2018/1/00027]
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The main aim of this research is to assess the suitability of different fly ashes as raw materials for manufacturing geopolymers. The study found that materials based on fly ashes had similar compressive strength but significant differences in flexural strength, with ultra-fine fly ash showing lower flexural strength. Process optimization is needed for materials based on a precursor from a waste incineration plant.
The main aim of this research is to assess different fly ashes as raw materials for the manufacturing of geopolymers. Three different fly ashes have been investigated. First, a conventional fly ash from the Skawina coal power plant (Poland), obtained at a temperature of 900-1100 degrees C. Second, ultra-fine fly ash from a power plant in China; the side product received at 1300 degrees C. The third fly ash was waste was obtained after combustion in incineration plants. To predict the properties and suitability of materials in the geopolymerization process, methods based on X-ray analysis were used. The applied precursors were tested for elemental and chemical compounds. The investigations of geopolymer materials based on these three fly ashes are also presented. The materials produced on the basis of applied precursors were subjected to strength evaluation. The following research methods were applied for this study: density, X-ray fluorescence (XRF), X-ray diffraction analysis (XRD), Scanning Electron Microscopy (SEM), flexural and compressive strength. The obtained results show that materials based on fly ashes had a similar compressive strength (about 60 MPa), while significant differences were observed during the bending test from 0.1 to 5.3 MPa. Ultra-fine fly ash had a lower flexural strength compared to conventional fly ash. This study revealed the need for process optimization for materials based on a precursor from a waste incineration plant.
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