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Gábor Mucsi, János Lakatos, Zoltán Molnár, Roland Szabó
Development of geopolymer using industrial waste materials
| Conference Information: |
9th International Conference on Environmental
Engineering, MAY 22-23, 2014 Vilnius, LITHUANIA |
| Source: |
ICEE-2014 - International Conference on Environmental
Engineering |
| Book Series: |
International Conference on Environmental Engineering
(ICEE) Selected papers |
| ISSN: |
ISSN 2029-7092 online |
| ISBN: |
978-609-457-640-9 / 978-609-457-690-4 CD |
| Year: |
2014 |
| Publisher: |
Vilnius Gediminas Technical University Press Technika |
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Abstract
Coal burned thermal power plants are producing large amounts of solid waste, fly ash. The disposal of this waste is a huge environmental
problem at this moment. Generally, fly ash particles are very fine (< 100 µm) and mainly round shaped and glassy materials form an outer
shell on it. According to several authors the attrition or grinding of this shell improves the activity of the fly ash. This paper deals with the
laboratory investigation of ground fly ash based geopolymer. This material can be applied in many fields, mainly in the construction
industry, e.g. non-structural elements, concrete, pavements and products, containment and immobilization of toxic, hazardous and
radioactive wastes, advanced structural tooling and refractory ceramics, and fire resistant composites used in buildings, etc…
In this study, the main process engineering properties of the raw materials, such as particle size distribution, moisture content, density and
specific surface area are shown. Beside fly ash, red mud in different rate was used to prepare geopolymer. Systematic experimental series
were carried out in order to optimize the preparation process. The particle size distribution of fly ash was measured by laser diffraction,
the structure of fly ash and geopolymer was determined by Fourier Transformed Infrared Spectroscopy (FT-IR). The strength of the
formed geopolymers was characterized by the uniaxial compressive strength. Additionally, leaching tests were carried out to monitor the
stability of the main element of the fly ash. The product properties were studied as function of fly ash fineness.
As a result of the investigation it was found that the geopolymer strength increased as function of fly ash fineness. Furthermore, it was
established that the red mud had a positive effect on geopolymer strength. Therefore, the synergetic application of the above wastes is of
good potential to create an industrial final product. Of course, several further experimental work is necessary to study the system from
environmental point of view.
Keywords: fly ash; red mud; geopolymer; mechanical activation.
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