Characterization of Fly Ash Nagan Raya as an Alternative Material in Geopolymer Mortar

DOI

10.2991/978-94-6463-926-1_95How to use a DOI?

Keywords

Compressive strength; FANR; Microstructure; Setting time; Workability

Abstract

This study investigated the potential of FANR, Aceh, Indonesia, as an alternative precursor material for geopolymer mortar. FANR was analyzed through X-Ray Fluorescence (XRF), X-Ray Diffraction (XRD), and Scanning Electron Microscopy (SEM) to determine its chemical composition, crystalline structure, and morphology. The results showed that FANR contained high SiO₂ (48.04%), Al₂O₃ (27.62%), and CaO (6.44%), with crystalline phases including quartz, mullite, magnetite, and hematite. Morphological analysis revealed spherical particles with a rough surface texture, enhancing reactivity under alkaline activation. The production of geopolymer mortar was achieved by the combination of NaOH solutions (4–10 M) with Na₂SiO₃ at ratios (2.0 and 3.5), while keeping the alkali solution-to-FANR ratio at 1.1. The mixtures were cast into 50 mm cubes and cured at room temperature for 28 days. The results indicated that higher NaOH molarity and Na₂SiO₂/NaOH ratios reduced workability due to increased viscosity, while setting time increased with NaOH molarity but decreased with higher sodium silicate ratios. The compressive strength rose with molarity up to 8 M, then showed a slight reduction at 10 M, whereas higher Na₂SiO₃/NaOH ratios promoted a denser microstructure and compressive strength. Overall, FANR demonstrated promising potential as a sustainable precursor for geopolymer mortar, offering both environmental and engineering benefits.

Copyright

© 2025 The Author(s)

Open Access

Open Access This chapter is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/), which permits any noncommercial use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.

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TY  - CONF
AU  - Aulia Rachman
AU  - Amir Fauzi
AU  - Muhammad Arifai
AU  - Edi Majuar
AU  - Iskandar
AU  - Erna Yusniyanti
AU  - Ismail Ismail
PY  - 2025
DA  - 2025/12/31
TI  - Characterization of Fly Ash Nagan Raya as an Alternative Material in Geopolymer Mortar
BT  - Proceedings of the International Conference on Applied Science and Technology on Engineering Science 2025 (iCAST-ES 2025)
PB  - Atlantis Press
SP  - 851
EP  - 859
SN  - 2352-5401
UR  - https://doi.org/10.2991/978-94-6463-926-1_95
DO  - 10.2991/978-94-6463-926-1_95
ID  - Rachman2025
ER  -