@ARTICLE{Hidayati_Ririn_Eva_Setting_2021,
 author={Hidayati, Ririn Eva and Faradilla, Fitria Sandi and Dadang, Dadang and Harmelia, Lia and Nurlina, Nurlina and Prasetyoko, Didik and Fansuri, Hamzah},
 volume={vol. 66},
 number={No 4},
 journal={Archives of Metallurgy and Materials},
 pages={1115-1121},
 howpublished={online},
 year={2021},
 publisher={Institute of Metallurgy and Materials Science of Polish Academy of Sciences},
 publisher={Committee of Materials Engineering and Metallurgy of Polish Academy of Sciences},
 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.},
 type={Article},
 title={Setting Time and Compressive Strength of Geopolymers Made of Three Indonesian Low Calcium Fly Ash with Variation of Sodium Silicate Addition},
 URL={http://ochroma.man.poznan.pl/Content/119304/PDF/AMM-2021-4-33-Fansuri.pdf},
 doi={10.24425/amm.2021.136431},
 keywords={fly ash, geopolymer, Sodium silicate, low calcium, waste management},
}