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University of Zenica , Zenica , Bosnia and Herzegovina
Cement Plant Kakanj
Donji Vakuf
In this paper, the influence of Na2SiO3 /NaOH ratio on the compressive strength of fly ash - based geopolymers was tested. The fly ash from thermal power plant Stanari near Doboj, BiH is used.The ratio of alkali activator to fly ash (AA / FA ratio) was constant in all samples and it was 0.8. A 12M NaOH solution was used. The heat treatment temperatures of the samples were 60, 70 and 80 ° C. The samples are made of fly ash and alkali activators, without the addition of aggregates, so they are geopolymer pastes. The compressive strengths after 1, 7 and 28 days from the thermal treatmentwere tested. The obtained values of compressive strengths, especially after 1 and 7 days, are far above the compressive strengths of cement.
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