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CDW GLASS-BASED SOLID ACTIVATORS DEVELOPMENT FOR FLY ASH GEOPOLYMERIZATION

Panitsa, O.; Kioupis, D.; Kakali, G.
Abstract:
One of the circular economy’s principals is to «keep products and materials in use». Geopolymerization technology is promising enough to support this principle as it exploits wastes and by-products as alternative raw materials streams. However, the challenge that must be overcome to commercialize geopolymers is the substitution of the caustic alkaline solution that activates the aluminosilicate raw material. The introduction of solid activators in the process has given great results. This paper deals with the synthesis of a CDW glass-based solid activator, a low embodied energy powder, rich in sodium silicate Na2SiO3, that has been developed through a simple procedure and it is capable to activate the aluminosilicate precursor. Glass cullet, NaOH and water were mixed together to create a pulp that through a mild heat treatment converted to the solid powder. Different synthesis parameters were tested (temperature and treatment duration) and different SiO2/Na2O molar ratios were examined (1 and 2). The prepared solid activators were evaluated through FTIR and XRD quantitative analysis and they were tested for fly ash geopolymerization. One-part geopolymers prepared using only the CDW glass-based solid activator treated at 150oC, with molar ratio SiO2/Na2O equal to 1, showed compressive strength close to 32 MPa.
SGEM Research areas:
Year:
2021
Type of Publication:
In Proceedings
Keywords:
one-part geopolymers; fly ash; solid activators; CDW glass
Editor:
• Prof. DSc. Oleksandr Trofymchuk, UKRAINE • Prof. Dr. hab. oec. Baiba Rivza, LATVIA
Volume:
21
SGEM Book title:
21st International Multidisciplinary Scientific GeoConference SGEM 2021
Book number:
6.1
SGEM Series:
SGEM International Multidisciplinary Scientific GeoConference
Pages:
189-198
Publisher address:
51 Al. Malinov blvd, Sofia, 1712, Bulgaria
SGEM supporters:
SWS Scholarly Society; Acad Sci Czech Republ; Latvian Acad Sci; Polish Acad Sci; Serbian Acad Sci & Arts; Natl Acad Sci Ukraine; Natl Acad Sci Armenia; Sci Council Japan; European Acad Sci, Arts & Letters; Acad Fine Arts Zagreb Croatia; Croatian Acad Sci
Period:
16 - 22 August, 2021
ISBN:
978-619-7603-30-9
ISSN:
1314-2704
Conference:
21st International Multidisciplinary Scientific GeoConference SGEM 2021, 16 - 22 August, 2021
DOI:
10.5593/sgem2021/6.1/s26.42
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