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Abstract

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.
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Authors and Affiliations

Ririn Eva Hidayati
1
Fitria Sandi Faradilla
1
Dadang Dadang
1
Lia Harmelia
1
Nurlina Nurlina
2
Didik Prasetyoko
1
Hamzah Fansuri
1

  1. Institut Teknologi Sepuluh Nopember, Department of Chemistry, Faculty of Science and Data Anlytics , Kampus ITS Sukolilo, Surabaya 60111, Indonesia
  2. Universitas Tanjungpura, Faculty of Mathematics and Natural Sciences, Department of Chemistry, Pontianak 78111, Indonesia

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