Binding gel characterization of alkali-activated binders based on palm oil fuel ash (POFA) and fly ash

Nadziri, Nurulhuda and Idawati, Ismail and Sinin, Hamdan (2018) Binding gel characterization of alkali-activated binders based on palm oil fuel ash (POFA) and fly ash. Journal of Sustainable Cement-Based Materials, 7 (1). pp. 1-14. ISSN 2165-0373

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Pastes of palm oil fuel ash (POFA) and fly ash geopolymer activated with sodium hydroxide (NaOH) and combination of NaOH with sodium silicate (Na2SiO3) were prepared and cured at 80 °C for a duration of 7, 28, and 90 days. The hydrated binding gel products were studied on phase, morphology, and bonding characterization. From these analyses, calcium–sodium–silicate–hydrate (C/N–S–H) gel type appear to form in sole POFA binder but at a very low Ca/Si ratio, while sole fly ash geopolymer binder consists of sodium–alumina–silicate–hydrate (N–A–S–H) binding gel product with a significant Na/Si ratio, regardless of activator types. When both precursors were used, a combination of both gel types was formed, however, Fourier transform infrared spectroscopy and energy-dispersive X-ray analyses show that the N–A–S–H gel is a more dominant product in the binder compared to the C/N–S–H gel. © 2017 Informa UK Limited, trading as Taylor & Francis Group.

Item Type: Article
Uncontrolled Keywords: geopolymer, alkali-activated binder, palm oil fuel ash, fly ash, unimas, university, universiti, Borneo, Malaysia, Sarawak, Kuching, Samarahan, ipta, education, research, Universiti Malaysia Sarawak.
Subjects: G Geography. Anthropology. Recreation > GE Environmental Sciences
T Technology > TP Chemical technology
Divisions: Academic Faculties, Institutes and Centres > Faculty of Engineering
Depositing User: Ibrahim
Date Deposited: 04 Apr 2018 02:27
Last Modified: 28 Apr 2021 22:42

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