Abstract
The aim of this study is to optimize the composition of geopolymer foam that leads to the highest water absorption. This study utilized Response Surface Methodology (RSM) to analyze the relationship between factors Seawater/Potassium Silicate (SW/KSil), Potassium Hydroxide/Potassium Chloride (KOH/KCl), Sodium Lauryl Ether Sulfate/Benzalkonium Chloride (SLES/BAC) and Hydrogen Peroxide/Nanocellulose (H2O2/NC) and its response, water absorption. The concentration of the alkaline solution is maintained at a low level of Molar Ratio (MR) 2.01-2.53 and 0.320 M to 1.620 M. It was found that all factors are significant with ρ-value < 0.05 except for KOH/KCl. The highest water absorption by geopolymer measured is 35%, in the middle range of all factors. Simple water immersion of 30 days shows no significant physical changes on the geopolymer, proving its rigidity under water.
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