Fabrication and characterization of non-foamed and foamed geopolymers from industrial waste clays
Autor: | H.E.H. Sadek, A.A. El-Kheshen, Mahmoud F. Zawrah, H.A. Badr, S.E. Abo Sawan, R.M. Khattab |
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Rok vydání: | 2021 |
Předmět: |
Materials science
Scanning electron microscope Process Chemistry and Technology Metallurgy Microstructure Industrial waste Surfaces Coatings and Films Electronic Optical and Magnetic Materials law.invention Geopolymer Compressive strength law Materials Chemistry Ceramics and Composites Calcination Porosity Metakaolin |
Zdroj: | Ceramics International. 47:29320-29327 |
ISSN: | 0272-8842 |
Popis: | In this work, an attempt to recycle Cyclones' and Feeders' waste-clays in fabrication of non-foamed and foamed geopolymers was performed. These industrial solid wastes are created as by-products from refractory industry. Firstly, the starting clay-wastes were converted into metakaolin by calcination at 850 °C. The calcined and uncalcined wastes were analyzed by X-ray fluorescence, X-ray diffraction and FT-IR. The calcined and uncalcined waste-clays were mixed with the suitable amounts of alkali activator to produce non-foamed and foamed geopolymers. The phase composition, physical properties, compressive strength and microstructure of the prepared geopolymers were examined by X-ray technique, Archimedes water-displacement method, hydraulic mechanical testing machine, and scanning electron microscope, respectively. The results revealed that non-foamed and foamed geopolymers were successfully prepared from the selected waste clays. The geopolymer that prepared from calcined Feeder's waste-clay exhibited the best compressive strength (29.4 MPa) among the other non-foamed geopolymers. The geopolymer prepared from 50% calcined Feeder's waste-clay and 50% calcined Cyclone's waste-clay exhibited also good compressive strength (19.6 MPa). Moreover, geopolymer foam with suitable compressive strength (8.46 MPa) was prepared from calcined Cyclone's waste-clay. The foamed geopolymer had higher apparent porosity and lower bulk density than the non-foamed geopolymers. |
Databáze: | OpenAIRE |
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