Fractal Characteristics of Pore Structure of Calcium-based Geopolymer Based on Nitrogen Adsorption
MA Xiao1,2, XIE Xuepeng2, YE Xiongwei3, HE Jupeng2, ZHU Jie2
1 School of Architectural Engineering, Guangdong University of Petrochemical Technology, Maoming 525000 2 School of Architecture and Transportation Engineering, Guilin University of Electronic Technology, Guilin 541004 3 Tellhow Sci-Tech Co., Nanchang 330046
Abstract: The study on the fractal characteristics of the pore structure of calcium-based geopolymer were carried out base on the nitrogen adsorption experiment. The fractal dimensions were calculated by FHH and thermodynamic models, and the calculation results of the two models are compared in detail. Moreover, the relationship between the fractal dimensions and the pore structure parameters, the sodium hydroxide content and the macro-mechanical properties were discussed. It could be found in the results that the calcium-based geopolymer exhibit a pore structure of obvious multi-fractal features. FHH model was found to be more capable for the characterizing the fractal features of the pore structure of calcium-based geopolymer. The fractal dimensions calculated by FHH model ranged from 2 to 3. A larger fractal dimensions resulted in a larger pore specific surface area, a lager total pore volume, a shorter average aperture and a more complex pore structure, which contribute to improve the compression strength of calcium-based geopolymer. There is no obvious correlation between the fractal dimensions and doping amount of sodium hydroxide. In conclusion, the complexity of the pore structure has proven to be the main influence factor on the mechanical properties of calcium-base geopolymer.
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2019, Vol. 33 
