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Characterization of chemosynthetic Al2O3–2SiO2 geopolymers

2009; Elsevier BV; Volume: 356; Issue: 2 Linguagem: Inglês

10.1016/j.jnoncrysol.2009.10.008

1873-4812

Xuemin Cui, Leping Liu, Guangjian Zheng, Ruiping Wang, Jianping Lu,

Magnesium Oxide Properties and Applications

Pure chemosynthetic Al2O3–2SiO2 geoploymers displaying positive alkali-activated polymerization properties and high compressive strength at room temperature were effectively fabricated utilizing a sol–gel method. The molecular structure of the precursor powder and resulting geopolymers were investigated by X-ray diffraction (XRD) and nuclear magnetic resonance (NMR) analysis. In addition, the mechanical and alkali-activated polymerization properties of these materials were also studied. NMR data revealed that the chemosynthetic powders began to contain 5-coordinated Al atoms when the calcination temperatures exceeded 200 °C. These calcined powders were capable of reacting with sodium silicate solutions at calcination temperatures exceeding 300 °C, which is, however, much lower than the temperature required to convert kaolin to Metakaolin.