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Compressive Strength and Water Flux Performance of Type C and Type F Fly Ash-Based Geopolymer Membrane

Nurlina Nurlina, Alief Mohammad Naufal, Rahmawati Zeni, Nurherdiana Silvana Dwi, Susanto Tri Eddy, Fansuri Hamzah

Archives of Metallurgy and Materials

2024

Vol. 69, iss. 3

1107--1113

This study explains the influence of fly ash type C and type F on the properties of membrane geopolymer. The geopolymer paste was synthesized through a mix of fly ash (FA) and an alkaline activator (AA) (2:1 mass ratio of FA:AA). The alkali activator was prepared from sodium silicate and 12 M sodium hydroxide solution in a mass ratio of 1.6. Hydrogen peroxide 3 wt.% was applied as the pore-forming agent, and 4 wt.% glass fiber was employed for reinforcement. The properties of the geopolymer were investigated via Fourier-transform infrared, X-ray diffraction, and scanning electron microscopy. The compressive strength confirmed the higher performance of the type C fly ash-based geopolymer membrane (CFAGM) over the type F fly ash-based geopolymer membrane (FFAGM). On the other hand, FFAGM exhibited an enhanced water permeation flux owing to the larger pore diameter. These results affirmed the excellent performance compared to the previous study.

Setting Time and Compressive Strength of Geopolymers Made of Three Indonesian Low Calcium Fly Ash with Variation of Sodium Silicate Addition

Hidayati Ririn Eva, Faradilla Fitria Sandi, Dadang Dadang, Harmelia Lia, Nurlina Nurlina, Prasetyoko Didik, Fansuri Hamzah

Archives of Metallurgy and Materials

2021

Vol. 66, iss. 4

1115--1121

In this research, the effect of sodium silicate (Na2SiO3) on the geopolymerization of fly ash type F (low calcium) has been studied. the variations of Na2SiO3 used in the synthesized geopolymers were 19, 32, and 41wt%. the fly ash from three different power plant sources was characterized using X-Ray Fluorescence (XRF), X-Ray diffraction (XRD), Particle Size Analyzer (PSA), and Scanning Electron Microscopy (SEM). Fly ash-based geopolymers were tested for mechanical strength and setting time. The best geopolymer was obtained by adding 32% Na2SiO3, produced a compressive strength of 21.62 MPa with a setting time of 30 hours. Additions of 19wt% Na2SiO3 failed to form geopolymer paste while the addition of 41wt% Na2SiO3 decreased the mechanical strength of the geopolymer. Higher calcium content in low calcium fly ash produces stronger geopolymer and faster setting time.