Effect of fly ash to alkali activator ratios on pore properties of porous fly ash-based geopolymer under curing by microwave irradiation

Name: Komchan Meecharoen

Organization : Chulalongkorn University. Department of Material Science

Name: Khanthima Hemra

Organization : National Metal and Materials Technology Center (MTEC)

Name: Sitthisak Prasanpan

Organization : National Metal and Materials Technology Center (MTEC)

Name: Sirithan Jiemsirilers

Organization : Chulalongkorn University. Department of Material Science

Email : Sirithan.j@chula.ac.th

keyword: Alkali-activated materials

LCSH: Inorganic polymers

; Pore structure

LCSH: Fly ash

LCSH: Microwave heating

LCSH: Concrete

Abstract: This study investigates the synthesis of porous geopolymers from fly ash using microwave irradiation. Microwave heating is a rapid and energy-efficient method for curing geopolymers to achieve pore structures. Porous geopolymers were prepared by mixing different weight percentages of fly ash (40%, 50%, and 60%) with sodium silicate solution and 10M sodium hydroxide solutions, with the weight ratio of Na2SiO3 to NaOH solution fixed at 2.5. Then, the geopolymer pastes were cured in a microwave oven at 800 W for 10 minutes. The resulting porous geopolymers were characterized using XRD, FT-IR, SEM, BET method, and their physical properties. The fly ash content significantly affected the physical properties, which are bulk density, apparent density, porosity, pore properties, and specific surface area. The porosity and specific surface area decreased with the increase in fly ash content, while the pore size and pore volume increased. The XRD result presented the characteristic broad hump of geopolymer that confirmed the presence of geopolymer gel formation. The FT-IR spectra confirmed the geopolymerization. SEM micrographs showed partially reacted fly ash particles and a dense geopolymer structure resulting from the microwave irradiation enhanced dissolution. This study successfully synthesized porous geopolymers from fly ash using microwave irradiation. The microwave foaming technique proved to be efficient in creating porous structures. Fly ash content significantly influenced the specific surface area and pore characteristics of the porous geopolymers

King Mongkut's University of Technology North Bangkok. Central Library

Address: BANGKOK

Email: library@kmutnb.ac.th

Created: 2024

Modified: 2024-12-02

Issued: 2024-12-02

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BibliograpyCitation : In Kasetsart University. Faculty of Science. The Pure and Applied Chemistry International Conference 2024 (PACCON 2024) (pp.584-589). Bangkok : Kasetsart University, 2024

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