Abstract: In this work, silica fume was used as a dispersant to treat aluminum powder foaming agent, and lightweight geopolymer-based filler materials with different dispersant contents (Ⅰ 0wt%; Ⅱ 80wt%; Ⅲ 90wt%; Ⅳ 95wt%) were prepared. The effects of foaming agent dispersion on the fluidity, setting time, compressive strength, permeability coefficient, and durability of lightweight geopolymer were investigated in depth. Moreover, the macroscopic pore structure of the sample was characterized using a stereomicroscope. The results showed that the appropriate dispersion treatment helped to improve the physical and mechanical properties of the specimens. Sample II exhibited the optimal dispersion ratio, with a 28 d compressive strength of 3.359 MPa. The high closed porosity (88.69%) effectively reduced the permeability coefficient of the specimens (1.18×10-6 cm/s), which remained at the 10-6 order of magnitude even after 14 days of immersion. In addition, the dispersion treatment of the foaming agent not only solved the pore size problem, but also optimized the pore distribution. This study not only provides a scientific basis for controllable aluminum powder foaming technology, but also offers a new strategy for the carrier materials of artificial floating islands. The research results promote the application of geopolymer-based materials in the field of artificial floating islands and are of great significance for the utilization of marine resources. This study demonstrates that waste materials can be transformed into new materials with practical value through scientific methods and innovative technologies, which not only reduces environmental pollution but also opens up a new way for the sustainable use of resources. The preparation and performance characterization of lightweight geopolymer materials for artificial floating islands reveal the possibility of geopolymer materials being applied to artificial floating island targets.

Key words: artificial floating island, controlled foaming, geopolymer, permeability coefficient, compressive strength

摘要： 本研究以硅灰为分散剂对铝粉发泡剂进行分散处理，制备不同分散剂掺量(Ⅰ 0wt%；Ⅱ 80wt%；Ⅲ 90wt%；Ⅳ 95wt%)的轻质地聚物基填充材料，考察发泡剂的分散程度对其流动性、凝结时间、抗压强度、渗透系数以及耐久性能的影响，并利用体视显微镜对试样的宏观孔结构进行表征。结果表明，适宜的分散处理有助于改善试样的物理和力学性能。Ⅱ号为最优的分散比例，28 d抗压强度为3.359 MPa。高的闭气孔率(88.69%)有效降低了试样的渗透系数(1.18×10-6 cm/s)，经14天浸泡处理后的试样，其孔结构未出现明显破坏，渗透系数仍维持在10-6数量级。同时，发泡剂的分散处理能有效解决孔径大小问题，并优化气孔分布。

关键词: 人工浮岛, 可控发泡, 地聚物, 渗透系数, 抗压强度