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Geopolymers based on phosphoric acid and illito kaolin

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Document pages: 7 pages

Abstract: A new three-dimensional geopolymer material was synthesized with illito kaolin and phosphoric acid as raw materials. The effect of silicon phosphorus molar ratio on the properties of geopolymer was studied. The structures of original, calcined clay and Geopolymer were studied by XRD, IR and SEM. The mechanical properties of phosphate geopolymers were evaluated by measuring the compressive strength. It is found that the silicon phosphorus molar ratio increases with the increase of the compressive strength of the obtained geopolymer, and reaches the maximum when the silicon phosphorus is equal to 2.75. Beyond this ratio, the mechanical strength decreases. The XRD patterns of these geopolymer samples show that the content of amorphous phase increases when the Si P molar ratio decreases. In addition, the structural analysis is also carried outhave revealed the presence of aluminum phosphate and Si-O-Al-O-P polymeric structure, whatever the Si P molar ratio is (between 2.25 and 3.5). The obtained results have confirmed that the presence of the associated minerals such as hematite and quartz in the clay does not prevent the geopolymerization reaction, but the presence of illite mineral seems to have a modest contribution in the geopolymerization.

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