Effects of Elevated Temperature and Activation Solution Content on Microstructural and Mechanical Properties of Fly Ash-based Geopolymer

Moutaoukil, Ghizlane; Alehyen, Saliha; Sobrados, Isabel; Safhi, Amine el Mahdi

doi:10.1007/s12205-023-1102-0

Cited by 3 publications

(2 citation statements)

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“…The loss of ignition (LOI) of the FA was found to be 7.1%, as presented in Table 1. The 29 Si and 27 Al NMR spectra of the initial fly ash, along with their deconvolution, are thoroughly presented in Figure 1 and discussed in our preceding paper [30]. 29 Si and 27 Al NMR fly ash spectra and their deconvolutions [30].…”

Section: Methodsmentioning

confidence: 98%

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Monitoring the Geopolymerization Reaction of Geopolymer Foams Using 29Si and 27Al MAS NMR

Moutaoukil,

Sobrados,

Alehyen

et al. 2024

Minerals

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This study aims to investigate the geopolymerization reaction of geopolymer foams produced with three different foaming agents: aluminum powder, zinc powder, and hydrogen peroxide. The geopolymerization reaction of geopolymer foam was monitored using the 27Al and 29Si magic angle spinning (MAS) nuclear magnetic resonance (NMR) spectroscopy technique. 27Al MAS-NMR was used to monitor the reaction at an early stage, while 29Si and 27Al MAS-NMR analyses were employed at specific time intervals of 3, 6, 10, 15, and 28 days to examine the changes that occurred in the formed gel over time. We discussed in detail how the type of foaming agent used and the duration of the reaction both influence the quantity of gel formed and the amount of remnant fly ash. Our findings indicate that the type of foaming agent used affects the formation and structure of the gel, with aluminum powder leading to the highest gel formation. Additionally, the duration of the reaction plays a significant role in determining the quantity of remnant fly ash, with longer reaction times resulting in decreased fly ash content. This study sheds light on the relevance of understanding the role of foaming agents in the geopolymerization reactions of geopolymer foams and the influence of reaction time on the formed gel properties.

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