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Vol 13, Issue 1, 2021
Pages: 212 - 219
Professional paper
Nonmetallic materials
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Published: 28.05.2021. Professional paper Nonmetallic materials

INFLUENCE OF Na2SiO3/NaOH RATIOS ON THE COMPRESSIVE STRENGTH OF FLY ASH BASED GEOPOLYMERS FROM THERMAL POWER PLANT STANARI IN BIH

By
Nadira Bušatlić ,
Nadira Bušatlić
Contact Nadira Bušatlić

University of Zenica , Zenica , Bosnia and Herzegovina

Ilhan Bušatlić ,
Ilhan Bušatlić

University of Zenica , Zenica , Bosnia and Herzegovina

Nevzet Merdić ,
Nevzet Merdić

Cement Plant Kakanj

Dženana Smajić-Terzić
Dženana Smajić-Terzić

Donji Vakuf

Abstract

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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