This study reports the preparation and characterization of alkali-activated slag based geopolymer foamed material (GFM). The roles of rice husk ash (RHA) on thermal stability and thermal insulation of GFM were systematically investigated. Thanks to the low self-weight and good reactivity of RHA, the compressive strength and specific compressive strength of GFM are enhanced, promoting the lightweight and high-strength developments of GFM. More importantly, the replacement of GGBS by RHA efficiently mitigates the strength degradation, reduces the weight loss and increases the volumetric stability of GFM during thermal exposure. The thermal conductivity of GFMs registered from 0.1102-0.2891 W/m•K reflects good thermal insulation characteristic, which is better than the reported thermal insulation properties of other alkali-activated foamed materials system at the same strength/density level. The mechanism of RHA acting on GFMs is closely related to the property characteristics of RHA itself, basic properties enhancement and pore structure development of GFMs. With the use of 20 wt.% RHA, the GFM containing 2 wt.% H₂O₂ exhibits the optimal comprehensive properties: 0.01270 × 10³kN•m/kg specific compressive strength, 827 kg/m³ volume density, 10.5MPa compressive strength, 0.1331 W/m•K thermal conductivity and better volumetric stability.

本研究报告了碱活化矿渣基地质聚合物泡沫材料 (GFM) 的制备和表征。系统研究了稻壳灰 (RHA) 对 GFM 热稳定性和隔热性的作用。由于RHA的低自重和良好的反应性，提高了GFM的抗压强度和比压强度，促进了GFM的轻量化、高强化发展。更重要的是，用 RHA 代替 GGBS 有效地减轻了强度下降，减少了重量损失并增加了 GFM 在热暴露期间的体积稳定性。从 0.1102-0.2891 W/m•K 记录的 GFM 的热导率反映了良好的隔热特性，在相同的强度/密度水平下，其隔热性能优于其他碱活化泡沫材料系统的报道。RHA作用于GFMs的机理与RHA本身的性能特点、GFMs的基本性能增强和孔隙结构发展密切相关。使用 20 wt.% RHA 时，含有 2 wt.% H 的 GFM₂ O ₂表现出最佳的综合性能：0.01270×10 ³ kN•m/kg比抗压强度，827 kg/m ³体积密度，10.5MPa抗压强度，0.1331 W/m•K热导率和更好的体积稳定性。