The effect of activator ratio and concentration molarity to setting time of geopolymer binder with umeanyar slate stone powder precursor
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Author |
Ni Kadek Astariani, I. Gusti Made Sudika, I. Gusti Ngurah Eka Partama, Putu Doddy Heka Ardana and Ni Pt Oktavintika Ayuningtyas
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e-ISSN |
1819-6608 |
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On Pages
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257-264
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Volume No. |
20
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Issue No. |
5
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Issue Date |
April 30, 2025
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DOI |
https://doi.org/10.59018/032538
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Keywords |
geopolymer, setting time, activator, slate stone, molarity.
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Abstract
In this research, the initial and final setting times will be measured on a geopolymer binder made from Umeanyar slate stone powder. Geopolymer binder is a geosynthetic binder that uses materials that are not derived from cement. The basic material for this binder is obtained from waste from the stone crushing industry in the Jembrana area. So far, this slate stone waste has only been used as a filler for road pavement. To increase the economic value of this waste, in this research, a geopolymer binder will be made with an alkaline activator consisting of sodium silicate (SS) and sodium hydroxide (SH) with varying activator ratios and varying molarity concentrations. There are 3 variations of activator (SS/SH), namely 1:1, 1.5:1, and 2:1, while variations in molarity concentration are 8M, 10M, and 12 M. The fastest initial and final setting time occurred at activator ratio of 2:1 (12 M), namely 136 minutes and 243 minutes.
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