Analysis and comparison of chemosynthetic and metakaolin based geopolymer

Reference Presenter Authors
04-010 Mariana Arruda Pereira Pereira, M.A.(Federal University of Minas Gerais); Vasconcelos, W.L.(Universidade Federal de Minas Gerais); Vasconcelos, D.C.(Universidade Federal de Minas Gerais); Lopes, G.B.(Universidade Federal de Minas Gerais); Geopolymer is a highly versatile and sensitive material, with numerous applications due to its susceptibility of refined characteristics changes, such as porosity, mechanical strength and setting time, depending on its starting compounds and processing (Duxson et al. 2006). Aluminosilicates and sodium hydroxide or silicate solutions are commonly the basis for obtaining geopolymers. This study analyses the applicability of synthetic and metakaolin raw materials utilized as aluminosilicate source for geopolymer as well as its influences on the final product. Other aluminosilicate sources, such as blast-furnace slags or fly ash, will not be discussed due to little homogeneity and purity of these compounds, resulting in higher standardization complexity compared to metakaolin and synthetic substances (Duxson et al. 2006). The main difference between the chemosynthetic and metakaolin geopolymer is the purity of the material, which has great influence on its usage. While the metakaolin product have great cementitious applications, due to corrosion resistance and mechanical strength, it also has a more complicated chemical composition since the presence of different metal-oxides depending on its mining region, difficulting its characterization (Cui et al. 2009). Differently, chemosynthetic geopolymer has a well defined composition, and a high level purity that enables its use as drug carrier or aircrafts material. Summarizing, throughout infrared spectroscopy (FTIR), surface area analysis (BET), MNR microscopy, mechanical strength tests, X-ray diffraction (XRD) and fluorescence (XRF), proposed in this preview, the observable advantage of using the metakaolin geopolymer stands on its cheaper cost for situations that do not demand high purity, whereas the chemosynthetic product is recommended for noble applications, in which the product composition must be well known, and smaller amounts are sufficient.
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