Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
A comparative analysis of ambient-cured metakaolin geopolymer mortar and flash-calcined soil geopolymer
https://orcid.org/0000-0001-7576-4687
https://orcid.org/0000-0002-4890-0820
Highlights Valorization of dredged sediments and excavated clays in geopolymer formulations. Adapting flash calcination at 750 °C as a pre-thermal technique for dredged sediments. Durability of flash-calcined sediment/flash-calcined clay – Metakaolin – Slag geopolymer.
Abstract This paper focuses on the development of a geopolymer (GP) mortar that can be cured under ambient conditions using flash-calcined dredged sediment (FCS) and flash-calcined excavated clay (FCC), as a substitute for Metakaolin (MK). Granulated blast furnace slag (GBFS) is also added to some of the GP mixes to study its effect on GP performance. Potassium silicate (K2SiO2) was used as an alkaline reagent (AR). Therefore, this study investigates the effect of binder composition on the mechanical and durability performance of the GP mortar samples. Acid attack test, high-temperature resistance test, and microstructural analysis tests such as X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR) were conducted to compare the reference mix with other substitute mixes containing FCS and FCC. Finally, the nuclear magnetic resonance (NMR) test is done on all GP mixes to verify their network classification. The results show that using FCS/FCC and only 10–20 % wt. of GBFS in the GP mortar mixes can result in similar or better properties in terms of strength and durability, while the NMR test identifies their tetrahedral network can vary between formulations.
A comparative analysis of ambient-cured metakaolin geopolymer mortar and flash-calcined soil geopolymer
https://orcid.org/0000-0001-7576-4687
https://orcid.org/0000-0002-4890-0820
Highlights Valorization of dredged sediments and excavated clays in geopolymer formulations. Adapting flash calcination at 750 °C as a pre-thermal technique for dredged sediments. Durability of flash-calcined sediment/flash-calcined clay – Metakaolin – Slag geopolymer.
Abstract This paper focuses on the development of a geopolymer (GP) mortar that can be cured under ambient conditions using flash-calcined dredged sediment (FCS) and flash-calcined excavated clay (FCC), as a substitute for Metakaolin (MK). Granulated blast furnace slag (GBFS) is also added to some of the GP mixes to study its effect on GP performance. Potassium silicate (K2SiO2) was used as an alkaline reagent (AR). Therefore, this study investigates the effect of binder composition on the mechanical and durability performance of the GP mortar samples. Acid attack test, high-temperature resistance test, and microstructural analysis tests such as X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR) were conducted to compare the reference mix with other substitute mixes containing FCS and FCC. Finally, the nuclear magnetic resonance (NMR) test is done on all GP mixes to verify their network classification. The results show that using FCS/FCC and only 10–20 % wt. of GBFS in the GP mortar mixes can result in similar or better properties in terms of strength and durability, while the NMR test identifies their tetrahedral network can vary between formulations.
A comparative analysis of ambient-cured metakaolin geopolymer mortar and flash-calcined soil geopolymer
https://orcid.org/0000-0001-7576-4687
https://orcid.org/0000-0002-4890-0820
Highlights Valorization of dredged sediments and excavated clays in geopolymer formulations. Adapting flash calcination at 750 °C as a pre-thermal technique for dredged sediments. Durability of flash-calcined sediment/flash-calcined clay – Metakaolin – Slag geopolymer.
Abstract This paper focuses on the development of a geopolymer (GP) mortar that can be cured under ambient conditions using flash-calcined dredged sediment (FCS) and flash-calcined excavated clay (FCC), as a substitute for Metakaolin (MK). Granulated blast furnace slag (GBFS) is also added to some of the GP mixes to study its effect on GP performance. Potassium silicate (K2SiO2) was used as an alkaline reagent (AR). Therefore, this study investigates the effect of binder composition on the mechanical and durability performance of the GP mortar samples. Acid attack test, high-temperature resistance test, and microstructural analysis tests such as X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR) were conducted to compare the reference mix with other substitute mixes containing FCS and FCC. Finally, the nuclear magnetic resonance (NMR) test is done on all GP mixes to verify their network classification. The results show that using FCS/FCC and only 10–20 % wt. of GBFS in the GP mortar mixes can result in similar or better properties in terms of strength and durability, while the NMR test identifies their tetrahedral network can vary between formulations.
A comparative analysis of ambient-cured metakaolin geopolymer mortar and flash-calcined soil geopolymer
Alloul, Ali (Autor:in) / Amar, Mouhamadou (Autor:in) / Benzerzour, Mahfoud (Autor:in) / Abriak, Nor-Edine (Autor:in)
03.11.2023
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Influence of the initial water content in flash calcined metakaolin-based geopolymer
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