A Comparative Study on Properties of Geopolymeric Material from Coal Ash

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Ubolluk Rattanasak
Prinya Chindaprasirt


This project was studied on the properties of geopolymeric material from fly ash and bottom ashobtained from Mae Moh power plant in Lumpang. Bottom ash was ground to have as small as fly ashparticle. Geopolymer paste was made by mixing the ash with NaOH solution and Na2SiO3 solution. Themass ratio of Na2SiO3/NaOH was varied at 0.5, 1.0, 1.5 and 2.0 by weight using 10 M NaOH. Twomixing methods were investigated; separated mixing (S) and normal mixing (N). Pastes were then curedat 65 oC for 48 hours in order to study the quantities of silica compound, Si-O-Si (stretching), by FourierTransform Infrared Spectrometer (FT-IR) at frequency of 1200-950 cm-1. Microstructure and thermalproperties of paste by Differential Scanning Calorimeter (DSC) were additionally carried out. Geopolymermortar was performed for the compressive strength. The results showed that quantities of reacted siliconcompound (Si-O-Si) depended on the Na2SiO3/NaOH ratio and mixing method. Na2SiO3/NaOH of 1.0 and1.5 gave a good performance and the highest compressive strength obtaining from fly ash-based geopolymerwas up to 350 ksc.

Keywords : Geopolymer / Fly Ash / Bottom Ash

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Author Biographies

Ubolluk Rattanasak, Burapha University, Muang, Chonburi 20131

Lecturer, Department of Chemistry, Faculty of Science

Prinya Chindaprasirt, Khon Kaen University, Muang, Khon Kaen 40002

Professor, Department of Civil Engineering, Faculty of Engineering