Characterization of MgO and Al2O3 based Refractory waste as partial replacement for Fly ash based Geopolymer

A. Harmaji; A. Adhikaprasetyo; B. Sunendar

doi:10.15330/pcss.25.2.289-296

Authors

A. Harmaji Institut Teknologi Bandung, Bandung, Indonesia
A. Adhikaprasetyo Institut Teknologi Bandung, Bandung, Indonesia
B. Sunendar Institut Teknologi Bandung, Bandung, Indonesia

DOI:

https://doi.org/10.15330/pcss.25.2.289-296

Keywords:

geopolymer, fly ash, refractory waste, compressive strength, FTIR

Abstract

Green process is a manufacturing technologies method without harming the environmental, one of the green process is reclaiming and reuse the manufacturing waste into applicable products. Geopolymer is one of the examples of green process products. Geopolymer are a material from synthesized aluminosilicate and alkali silicate that formed polymeric SiO₄ and AlO₄ structure. Geopolymer can be applicated for building or refractory material. Aluminosilicate material such as fly ash is used for Geopolymer precursor. In this study, fly ash as precursor is substituted by magnesium oxide (MgO) and aluminum oxide (Al2O₃)-based refractory waste. It was then activated by activator consist of sodium hydroxide (NaOH) and Na₂SiO₃ (water glass). Results shown that the compressive strength of Al₂O₃ refractory waste based geopolymer are generally higher than MgO refractory waste based geopolymer. The result showed an addition of Al₂O₃ refractory waste improved the compressive strength of geopolymer specimen. XRD and FTIR characterization conducted to analyse the morphological compound and bonding of resulting geopolymer. The substance that contained in MgO and Al₂O₃ refractory based geopolymer are Quartz, Periclase, Corundum and Albite. FTIR results shows the siloxo and sialate bond as proof of geopolymerization has successfully occured.

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