Preparation and Properties of Porous Geopolymers via In-situ Gas Generation from Metallic Silicon Powder
LI Fangxian1,*, WANG Zijing1, XI Shuang2, GU Yajie2, WEI Jiangxiong1, YU Qijun1
1 School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China 2 Zhejiang Zheneng Technology & Environment Group Co., Ltd., Hangzhou 310013, China
Abstract: This study presents a novel, environmentally friendly method for producing porous geopolymers using in-situ gas generation from metallic silicon powder at ambient temperature. This approach offers a significant advantage over conventional autoclaved aerated concrete (AAC) production by eliminating the energy-intensive autoclaving process and simplifying the manufacturing procedure, thus reducing both production costs and environmental impact. The influence of water glass modulus, water-to-solid ratio, and metallic silicon powder content on gas generation, pore structure, and mechanical properties was systematically investigated to optimize the process parameters. The results demonstrate that the gas generation process exhibits a 15～30 minute induction period, facilitating convenient on-site casting of the geopolymer slurry. The resulting mate-rial achieved a 120%—140% expansion rate with an average pore size of 270—342 μm. Its compressive strength reaches 3.01 MPa and 2.68 MPa after 96 h of steam curing and 28 d of natural curing, respectively. Compared to the aluminum powder-based gasification method, this technique yields porous geopolymers with a more uniform pore size distribution and a more regular pore structure. This research offers a promi-sing new avenue for developing sustainable, eco-friendly, and on-site castable thermal insulation building materials with considerable engineering applications.
1 Zhao D L, Hu C Y, Bai D S, et al. Building Energy Efficiency, 2015, 43(3), 116 (in Chinese). 赵东来, 胡春雨, 柏德胜, 等. 建筑节能, 2015, 43(3), 116. 2 Aditya L, Mahlia T M I, Rismanchi B, et al. Renewable and Sustainable Energy Reviews, 2017, 73, 1352. 3 Narayanan N, Ramamurthy K. Cement and Concrete Composites, 2000, 22(5), 321. 4 Jerman M, Keppert M, Výborný J, et al. Construction and Building Materials, 2013, 41, 352. 5 Chen D M, Lu B, Li Z H. Guangdong Chemical Industry, 2018, 45(11), 161 (in Chinese). 陈德敏, 陆彪, 李智虎. 广东化工, 2018, 45(11), 161. 6 Xu J L, Jiang M X, Zhang R H, et al. Refractories, 2011, 45(6), 407 (in Chinese). 徐吉龙, 蒋明学, 章荣会, 等. 耐火材料, 2011, 45(6), 407. 7 Chai D X, Cao D G, Chen J H, et al. Concrete, 2009, 9(12), 29 (in Chinese). 柴大霞, 曹德光, 陈聚华, 等. 混凝土, 2009, 9(12), 29. 8 Sun M K. Research on application technology of wall thermal insulation material based on hydrogen peroxide foaming technology. Master’s Thesis, Xi’an Technological University, China, 2017 (in Chinese). 孙明昆. 基于双氧水发泡技术下的墙体保温材料应用技术研究. 硕士学位论文, 西安工业大学, 2017. 9 Dhasindrakrishna K, Pasupathy K, Ramakrishnan S, et al. Cement and Concrete Composites, 2021, 116, 103886. 10 Zhao J, Tong L, Li B, et al. Journal of Cleaner Production, 2021, 307, 127085. 11 Peng H, Chen Z K, Cui C, et al. Journal of Building Materials, 2017, 20(3), 379 (in Chinese). 彭晖, 陈治坤, 崔潮, 等. 建筑材料学报, 2017, 20(3), 379. 12 Tang N, Wang Y J, Zhao M Y, et al. Materials Reports, 2024, 38(8), 148 (in Chinese). 唐宁, 王延军, 赵明宇, 等. 材料导报, 2024, 38(8), 148. 13 Davidovits J. Geopolymer chemistry and applications, Saint-Quentin:Geopolymer Institute, France, 2008, pp. 56. 14 Bourret J, Prud’homme E, Rossignol S, et al. Journal of Materials Science, 2012, 47(1), 391. 15 Medri V, Papa E, Dedecek J, et al. Ceramics International, 2013, 39(7), 7657. 16 Luna-Galiano Y, Leiva C, Arenas C, et al. Journal of Non-Crystalline Solids, 2018, 500, 196. 17 Papa E, Medri V, Kpogbemabou D, et al. Energy and Buildings, 2016, 131, 223.
渝公网安备50019002502923号 版权所有：《材料导报》编辑部
2025, Vol. 39 
