Mechanical response of geopolymer foams to heating – managing coal gangue in fire-resistant materials technology
Authors:
- Mateusz Sitarz,
- Beata Figiela,
- Michał Łach,
- Kinga Korniejenko,
- Katarzyna Mróz,
- João Castro-Gomes,
- Izabela Hager
Abstract
Two geopolymer foams were prepared from a thermally activated coal gangue containing kaolinite. As the foaming agent, aluminium powder and 36% hydrogen peroxide were used to obtain two levels of porosity. The materials’ high temperature performances were investigated: tensile and compressive strength evolution with temperature. This study shows that the mechanical performances of developed geopolymer foams are similar to foam concrete of the same apparent density. The geopolymer foams from coal gangue present stable mechanical performances up to 600 °C. When the glass transition temperature is achieved, sintering occurs and mechanical performance increases. SEM observations confirm the glass transition and densification of the matrix at temperatures above 800 °C. Moreover, the XRD measurements revealed a high amount of mullite that forms at 1000 °C that explained the observed strength increase. The synthesis of good-quality geopolymer foams from coal gangue and its application as a thermal barrier is feasible. The constant level of porosity and its stable character in the range of temperatures 20–1000 °C ensures stable thermal insulation parameters with increasing temperature, which is extremely important for fire protection.
- Record ID
- CUT108eb52fffb140428485db66177feb06
- Publication categories
- ;
- Author
- Journal series
- Energies, ISSN , e-ISSN 1996-1073, Biweekly
- Issue year
- 2022
- Vol
- 15
- No
- 9
- Pages
- [1-17]
- Article number
- 3363
- Other elements of collation
- fot.; tab.; wykr.; Bibliografia (na s.) - 16-17; Bibliografia (liczba pozycji) - 52; Oznaczenie streszczenia - Abstr.; Numeracja w czasopiśmie - Vol. 15, Iss. 9, Spec. Iss.
- Substantive notes
- Special Issue: Low Energy and Carbon Footprint Building Materials - Waste Management and Recycling
- Keywords in English
- geopolymers, coal gangue, high temperature, mechanical performances
- ASJC Classification
- DOI
- DOI:10.3390/en15093363 Opening in a new tab
- URL
- https://www.mdpi.com/1996-1073/15/9/3363 Opening in a new tab
- Related project
- Language
- eng (en) English
- License
- Score (nominal)
- 140
- Score source
- journalList
- Score
- Publication indicators
- Additional fields
- Indeksowana w: Web of Science, Scopus
- Uniform Resource Identifier
- https://cris.pk.edu.pl/info/article/CUT108eb52fffb140428485db66177feb06/
- URN
urn:pkr-prod:CUT108eb52fffb140428485db66177feb06
* presented citation count is obtained through Internet information analysis, and it is close to the number calculated by the Publish or PerishOpening in a new tab system.