Effect of Kaolin and Basalt Composition on Geopolymer Characteristics
M. Amin1, S. Sudibyo1, D. C. Birawidha1, K. Isnugroho1, F. Bahfie1, S. Syafriadi2, S. Septiana2, Erlangga B. Dinda3
1Research Center of Mining Technology, National Research and Innovation Agency of Indonesia, Lampung, Indonesia
2University of Lampung, Bandar Lampung, Lampung, Indonesia
3Research Center of Geotechnology, National Research and Innovation Agency of Indonesia, Bandung, Indonesia
Keywords: Kaolin, basalt, geopolymer concrete, characteristics
Abstract
The effect of variations in the composition of kaolin and basalt on the geopolymer characteristics was carried out. The drying time was 4 h for cubic samples at 40, 50 and 60 oC and 9 h for cylindrical samples at 70 and 90 oC. The best geopolymer was K4 cylinder at 90 oC, which had a compressive strength of 8.075 MPa. The density of K2 cube geopolymer ranged as 26-1.94 g/cm3 at 60 oC. Silica-alumina compounds dominated the constituent compounds of geopolymer concrete, and the phases formed were quartz, anorthite and muscovite.
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