Abstract
Mineral polymer is a new category of inorganic non-mental materials, which was manufactured from metakaolin in this paper. Changes of metakaolin in the polymerization could be described as: (1) the glassy parts of the metakaolin were dissolved in the high molar alkaline solution and some SiO, AlO bonds of them broke; (2) at the presence of OH-and Na+, these broken bonds formed aluminosilicate gel and then transformed into zeolitic precursors with changing compositions and concentrations of the solution; (3) by dehydration, these zeolitic precursors changed into the amorphous phase materials. NMR analysis indicated that in the geopolymeric products cured for 28 days, Q4(2Al) was the principal form of Si element and the content of four coordinate Al was increasing with the reaction. The experimental results provided a good basis for understanding the reactive mechanism of polymerization during processing of geopolymer products.
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