Comparative Analysis Between Fly Ash Geopolymer and Reactive Ultra-Fine Fly Ash Geopolymer

Wei-Ting Lin; Kae-Long  Lin; Kinga  Korniejenko; Lukáš  Fiala

doi:10.46604/ijeti.2021.7129

Authors

Wei-Ting Lin Department of Civil Engineering, National Ilan University, Yilan, Taiwan
Kae-Long Lin Department of Environmental Engineering, National Ilan University, Yilan, Taiwan
Kinga Korniejenko Institute of Materials Engineering, Faculty of Materials Engineering and Physics, Cracow University of Technology, Kraków, Poland
Lukáš Fiala Department of Materials Engineering and Chemistry, Faculty of Civil Engineering, Czech Technical University in Prague, Prague, Czech Republic

DOI:

https://doi.org/10.46604/ijeti.2021.7129

Keywords:

reactive ultra-fine fly ash, alkali activator, spherical particles, microscopic properties, amorphous

Abstract

This study investigates novel geopolymers by combining Reactive Ultra-fine Fly Ash (RUFA) with 4M sodium hydroxide as an alkali activator. Comparing with general fly ash geopolymers, RUFA geopolymer pastes are characterized in terms of compressive strength, microstructure, and crystalline phases. The RUFA geopolymer is successfully obtained as alumina-silicate bonding materials with the same properties as the general fly ash-based geopolymer. The high compressive strength of the RUFA-based geopolymer samples (13.33 MPa) can be attributed primarily to Ca-based alumino-silicate hydration products and Na-based alumino-silicate complexes. This research presents an innovative application for geopolymers using RUFA. In the follow-up study, the influence of synthesis and concentration of alkali activator can be considered in RUFA-based geopolymers.

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