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Fly ash porous material using geopolymerization process for high temperature exposure.

Mohd Mustafa Al Bakri Abdullah¹, Liyana Jamaludin¹, Kamarudin Hussin¹

¹School of Material Engineering, University Malaysia Perlis (UniMAP), P.O. Box 77, D/A Pejabat Pos Besar, Kangar, Perlis 01000, Malaysia.

International Journal of Molecular Sciences

|May 19, 2012

Summary

This study investigated porous geopolymers made from fly ash. Surprisingly, these materials showed increased strength after exposure to high temperatures (600-1000 °C), indicating thermal stability.

Keywords:

geopolymer pozzolanic material thermal analysis

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Area of Science:

Materials Science
Ceramics and Composites
Geopolymer Chemistry

Background:

Geopolymers are inorganic polymers with potential applications in construction and high-temperature materials.
Fly ash, a byproduct of coal combustion, is a common precursor for geopolymer synthesis.
Understanding the thermal performance of geopolymers is crucial for their use in demanding environments.

Purpose of the Study:

To evaluate the effect of high-temperature exposure on the compressive strength of porous geopolymers.
To investigate the phase formation and microstructural changes in geopolymers after thermal treatment.
To determine the thermal stability and potential for strength enhancement in fly ash-based geopolymers.

Main Methods:

Fly ash was used as a pozzolanic material, activated by sodium hydroxide and sodium silicate solutions.
A foaming agent was incorporated into the geopolymer paste before curing at 60 °C for 24 hours.
Geopolymer samples were sintered at temperatures ranging from 600 °C to 1000 °C.
Compressive strength, phase composition, and microstructure were analyzed after heat treatment.

Main Results:

Porous geopolymers exhibited an increase in compressive strength after exposure to temperatures between 600 °C and 1000 °C.
Microstructural analysis revealed changes in phase formation consistent with enhanced structural integrity at elevated temperatures.
The observed strength increase suggests improved thermal stability and potential for self-healing or densification.

Conclusions:

Fly ash-based porous geopolymers demonstrate remarkable strength enhancement upon exposure to high temperatures.
These findings challenge conventional expectations of thermal degradation and highlight the potential of geopolymers for high-temperature applications.
Further research into the mechanisms behind this thermal strengthening is warranted for optimizing geopolymer performance.