Optimization Density of Geopolymer Concrete based on Taguchi Method

Ndaru Candra Sukmana, Andry Agung Pambudi, Ufafa Anggarini
1. Engineering Management, Universitas Internasional Semen Indonesia, Gresik, INDONESIA
2. Chemical Engineering, Universitas Internasional Semen Indonesia, Gresik, INDONESIA
*ndaru.sukmana@uisi.ac.id

Abstract
High density geopolymer concrete can be applied as a breakwater because this particular material is able tobreak high sea waves and is not easily carried by them. Geopolymer concrete is composed of fly ash, sodium silicate, and activator solution. The Taguchi method can be used to determine the factors that affect the density of geopolymer concrete, as well as the optimum composition that can produce the highest density. Controlled factors in this study were a silica/alumina ratio, solid/liquid ratio, sodium hydroxide concentration and aggregate type.
The results of this study indicate that the ratio of silica/alumina, solid/liquid ratio, and type of aggregate has a significant effect on the density of geopolymer concrete. The optimum composition of geopolymer concrete is silica/alumina 9, solid/liquid 70:30, sodium hydroxide concentration of 6 M and aggregate type of granite yielding the density of 2,41 gram/cm3 and 21 MPa compressive strength.

Keywords: Geopolymer concrete, density, Taguchi method

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