| Structure characterization for the geopolymer of sodium silicate and metakaolin |
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| 作者姓名： | 曹德光 |
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| 作者单位： | Institute of |
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| 摘 要： | 1 Introduction 1 During the last decade a new kind of material called geopolymer has emerged as a viable alternative for many conventional cements and plastics. Geopolymer is inorganic polymer derived from metakaolin and sodium silicate solution. It can be synthesized at low temperature and have useful properties such as high compressive strength. It is stable at temperatures up to 800 °C and even 1150 °C while ordinary Portland cement loses its strength at 500 °C 1]. Several microstruct…
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| 关 键 词： | 水泥 硅酸钠 偏高岭土 二氧化硅 |
Structure characterization for the geopolymer of sodium silicate and metakaolin |
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| CAO De-guang,SU Da-gen.Structure characterization for the geopolymer of sodium silicate and metakaolin[J].Journal of Chongqing University,2005,4(2):70-73. |
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| Authors: | CAO De-guang SU Da-gen |
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| Abstract: | Geopolymers of metakaolin and sodium silicate were synthesized respectively with the ratios of the amount of SiO2 in the sodium silica solution to that of Al2O3 in metakaolinite equal to 1.0, and 0.66. The geopolymeric structures of the products were investigated by 27Al and 29Si solid-state nuclear magnetic resonances with magic-angle spinning (MAS NMR), Fourier transform infrared spectroscopy (FTIR), X-ray powder diffraction (XRD), differential scanning colorimetry (DSC) and scanning electron microscopy (SEM). The reaction of the Al-O sheet in meakaolinite with low-order polymerized Si-O tetrahedral units such as monomer of SiO4 yields three-dimensional structures with the Q3 Si-O tetrahedral structure and the coordination of Al(IV) in the Al-O tetrahedral structure. The geopolymers are essentially X-ray amorphous. The assays by 27Al and 29Si NMR, FTIR confirm that the active structure in the metakaolinite is the sheet of Al-O with three coordination states. |
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| Keywords: | geopolymer microstructure metakaolin sodium silicate solution metakaolin sodium silicate geopolymer characterization active structure states amorphous reaction sheet units monomer yields tetrahedral coordination scanning electron microscopy differential colorimetry powder diffraction FTIR |
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