Pozzolans used in the research were < 45 μm
FA, BA and RHA. Compressive strength of
geopolymers of FA with either BA or RHA
was higher than that of single BA or RHA BA or RHA. The FA/BA geopolymer presented
good strength at early age while the FA/RHA
developed its strength at older age. The proper
alkali liquid of blended FA/BA and FA/RHA
was 40% by weight. Finally, cost of mortar
production from geopolymers was a little
more expensive than that from cement for
approximately 0.45 US dollar/kg.
Acknowledgements
We are grateful to Department of Science and
Service, Ministry of Science and Technology,
Bangkok for their teaching about synthesis
of geopolymers.