| INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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| Fractal Characteristics of Pore Structure of Calcium-based Geopolymer Based on Nitrogen Adsorption |
| MA Xiao1,2, XIE Xuepeng2, YE Xiongwei3, HE Jupeng2, ZHU Jie2
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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 |
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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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Published: 31 May 2019
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| Fund:This work was financially supported by the National Natural Science Foundation of China (51468009), Innovation Project of Guet Graduate Education(2017YJCX123) and Research Fund of Guangdong University of Petrochemical Technology (2018rc15). |
| About author:: Xiao Mareceived his Ph.D. degree in civil enginee-ring materials from Central South University in October 2012. He is a Professor in Guangdong University of Petrochemical Technology, focusing on research of green cementing materials and high performance concrete. |
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1 Davidovits J. Geopolymer chemistry & application, National Defense Industry Press, China, 2011(in Chinese).
约瑟夫·戴维德维斯. 地聚合物化学及应用,国防工业出版社, 2011.
2 Das S, Yang P, Singh S S,et al. Cement and Concrete Research, 2015, 78, 252.
3 Mandelbort B B. The fractal geometry of nature, Time Books, San Francisco, 1982.
4 Pfeiffr P, Avnir D. Journal of Chemical Physics, 1983,79(7), 3558.
5 Ming Tang, Jing Qi Li. Journal of Paleontology, 2011, 415-417(2), 1545.
6 Pfeifer P, Obert M, Cole M W. Proceedings of the Royal Society A-Mathematical, Physical & Engineering Sciences, 1989, 423(1864), 169.
7 Avnir D, Jaroniec M. Langmuir, 1989, 5(6), 1412.
8 Alexander V. Neimark, Klaus K U. Journal of Colloid and Interface Science, 1993, 158(2), 412.
9 Kiselev A B. The structure and properties of porous materials,Butterworths, Academic Press, UK, 1958.
10Ma X, Ye X W, Zhu J, et al. Journal of Building Materials, 2017,20(3), 373 (in Chinese).
马骁, 叶雄伟, 朱杰, 等.建筑材料学报, 2017, 20(3), 373.
11Jaroniec M. Langmuir, 1995, 11(6), 2316.
12Sahouli B, Blacher S, Brouers F. Langmuir, 1996, 12(11), 2872.
13Elshafei G M S, Philip C A, Moussa N A. Journal of Colloid & Interface Science, 2004, 227(2), 410.
14Li Y X, Chen Y M, He X Y, et al. Journal of the Chinese Ceramic Society, 2003, 31(8), 774 (in Chinese).
李永鑫, 陈益民, 贺行洋, 等. 硅酸盐学报, 2003, 31(8), 7749.
15Zhu W Y, et al. Materials science fractal, Chemical Industry Press, China, 2004(in Chinese).
褚武杨,等. 材料科学中的分形,化学工业出版社,2004.
16Jin S S, Zhang J X, Chen C Z, et al. Journal of Building Materials, 2011, 14(1), 92 (in Chinese).
金珊珊, 张金喜, 陈春珍,等. 建筑材料学报, 2011, 14(1), 92. |
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2019, Vol. 33 
