The role of chemistry and fineness of metakaolin on the fresh properties and heat resistance of blended fly ash-based geopolymer

Autor: Ahmed Mohamed Abbass, Rafia Firdous, Jean Noel Yankwa Djobo, Dietmar Stephan, Mohamed Abd Elrahman
Jazyk: angličtina
Rok vydání: 2023
Předmět:
Zdroj: SN Applied Sciences, Vol 5, Iss 5, Pp 1-17 (2023)
Druh dokumentu: article
ISSN: 2523-3963
2523-3971
DOI: 10.1007/s42452-023-05359-y
Popis: Abstract Sensible thermal energy storage using concrete as a storage medium is a promising technology that helps minimize energy in power plant. The purpose of this study is to evaluate the potential benefits of metakaolin (MK) as a partial substitute for fly ash-based geopolymer for heat resistance. As a partial substitute (5 and 20 wt.%) for fly ash (FA), nine metakaolins containing different alumina contents were selected. In order to assess their potential for storing high-temperature thermal energy, physical and microstructural analyses were performed before and after heat exposure up to 500 °C. Low packing density limits the workability of some metakaolins and increases water demand in pastes. The mechanical properties of geopolymer weaken as the temperature is raised (
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