Effect of alkali choice on geopolymer properties

Waltraud M Kriven, Jonathan L. Bell

Research output: Contribution to journalConference articlepeer-review


A series of geopolymers were made using both KOH and NaOH alkaline solution by curing in an autoclave at 1000 psi and 80°C, respectively, for 24 hours. Samples were made using only KOH or NaOH or some combination thereof. The resulting samples were tested using scanning electron microscopy (SEM), environmental scanning electron microscopy (ESEM), mercury intrusion porosimetry (MIP), and x-ray diffraction (XRD). The autoclave technique produced highly reacted, 0.25 in. diameter, cylindrical samples which were virtually free of macropores. A separate series of 1 in. diameter compression samples were made and tested after being cured at 40°C for 24 hours. It was found that there may be a critical combination of KOH and NaOH that can be added to produce a highly dissolved and crossed linked sample. The multiple alkali sources can act in a synergistic fashion to create a sample of optimal properties.

Original languageEnglish (US)
Pages (from-to)99-104
Number of pages6
JournalCeramic Engineering and Science Proceedings
Issue number4
StatePublished - Dec 1 2004
Event28th International Conference on Advanced Ceramics and Composites - Cocoa Beach, FL, United States
Duration: Jan 25 2004Jan 30 2004

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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