Study on the Regulation of Porous Geopolymer Pore Structure by Surfactants
XUE Siting1, CHEN Xiping1, LUO Hongjie1,2,*, WU Linli1, JIANG Hao3, LU Yihan1
1 School of Metallurgical Engineering, Northeastern University, Shenyang 110819, China 2 Engineering Research Center of Advanced Materials Preparation Technology, Ministry of Education, Shenyang 110819, China 3 Fushun Tiancheng Environmental Protection Technology Co., Ltd., Fushun 113001, Liaoning, China
Abstract: To optimize the pore structure of fly ash-based porous geopolymers, this work compared the effects of five surfactants on the pore characteristics and mechanical properties of fly ash-based porous geopolymers. The results show that the addition of surfactants doesn’t change the phase or chemical composition of the geopolymer matrix but improves the foam stability of the porous geopolymer by reducing the surface tension of the alkaline solution, thereby enhancing its pore structure. Based on a comprehensive evaluation of pore structure and compressive strength, the optimal addition amounts of the five surfactants are as follows:Meap-k 0.04%, SDS 3%, CTAB 2%, Tween-80 1%, and APG 0.7%. The effectiveness of the surfactants, in descending order, is Meap-k, APG, Tween-80, SDS, and CTAB. The sample prepared with the optimal Meap-k amount achieves a total porosity of 83.8% and an open porosity of 71.4%. The findings, by optimizing the pore structure of porous geopolymers, provide reliable experimental evidence for their application in areas such as dust smoke filtration and wastewater treatment.
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2026, Vol. 40 
