OPTIMASI RASIO Si/Al, RASIO PADATAN/CAIRAN, KONSENTRASI NaOH DAN JENIS AGREGAT DALAM SINTESA BETON GEOPOLIMER DENGAN METODE TAGUCHI

Abstract

The optimization synthezised of geopolymer based on fly ash materials have been done by using Taguchi method. The experimental design was done with 4 factors and 3 levels, that were the influence of Si/Al ratio, solid/liquid ratio, NaOH and the type of aggregate. Geopolymers were synthesized by sol gel method at room temperature, using fly ash as aluminasilica source and alkaline activator solutions thain consist of NaOH and Na2SiO3. The influence of Si/Al ratio studied at level of 4.00, 4.25, 4,50, solid/liquid ratio at level of 1.50, 2.33, 4.00. NaOH (%wt/%v) of 0.24, 0.40, 0.56, and the type of aggregate of Malang sand, Bojonegoro sand and granite. Based on SNR analysis and the characterization determination of higher is better, the geopolymer optimum composition was Si/Al factor at level of 3 (4.50), solid/liquid ratio level at 2 (2.33), NaOH level at 1 (0.24) and type of aggregate level at 3 (granite). The calculation of compressive strength prediction was determined at 21.01 Mpa, while the optimum compressive strength of the experimental result was found at 21 Mpa. Keywords: Geopolymer, Taguchi Method, Si/Al, Solid/Liquid, NaOH, Type of agreggate