Geopolymer foam (GF) uses a potassium activator and can be cured at high temperatures, which can improve its mechanical properties. In this study, we attempted to test this hypothesis by comparing the flexural and compressive strength, apparent density and fire resistance of GF. The composition of the GF used in the experiment included a potassium activator, basalt ground fiber and aluminum powder with a mass ratio to the binder of 0.45, 0.3 and 0.015, respectively. The samples were cured at room temperature and at 50, 70, 85 and 105 °C with a curing time of 2, 4, 6, 12 and 24 h. Then, the samples were kept until being tested on the third, seventh, 14th and 28th day. The results showed that the flexural and compressive strength and apparent density improved and stabilized after seven days at 85 °C. Furthermore, the GF exhibited a substantial increase after three days in its flexural strength by 111% and compressive strength by 122.9% at the optimal temperature of 85 °C for 2 h compared to the values at RT after 28 days. The GF had an apparent density of 0.558–0.623 g/cm³ on the 28th day. As a new alternative to aluminum materials, investigating the fire resistance of sandwich panels (an aluminum plate covered with a GF layer) is important for their safe impregnation. Sandwich panels with thicknesses of 10–20 mm were exposed to a gas fire. The test results showed that the sandwich panels had significantly improved fire resistance compared to unprotected panels. The longest fire resistance times for the aluminum plate coated with 20 mm of GF layer thickness was 7500 s. Thus, the GF coated on the aluminum plate exhibited superior fire resistance and a reduced heat transfer rate compared to uncoated panels.

中文翻译：

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铝板上涂覆的地聚合物泡沫的固化时间和温度相关强度及耐火性的研究

地质聚合物泡沫（GF）使用钾活化剂，可以在高温下固化，从而可以改善其机械性能。在这项研究中，我们试图通过比较GF的弯曲强度和抗压强度，表观密度和耐火性来检验这一假设。实验中使用的GF的组成包括钾活化剂，玄武岩磨碎的纤维和铝粉，其与粘合剂的质量比分别为0.45、0.3和0.015。样品在室温，50、70、85和105°C下固化，固化时间为2、4、6、12和24小时。然后，保留样品直到在第三，第七，第十四和第二十八天进行测试。结果表明，在85°C下放置7天后，弯曲强度和抗压强度以及表观密度得到改善和稳定。此外，与28天后在室温下的值相比，在最适温度为85°C下持续2 h，三天后GF的弯曲强度显着提高了111％，抗压强度显着提高了122.9％。GF的表观密度为0.558–0.623 g / cm第28天³。作为铝材料的新替代品，研究夹芯板（覆盖有GF层的铝板）的耐火性对其安全浸渍至关重要。厚度为10–20 mm的夹心板暴露于煤气中。测试结果表明，夹芯板与未保护的板相比具有显着改善的耐火性。镀有20 mm GF层厚度的铝板的最长耐火时间为7500 s。因此，与未涂覆的面板相比，涂覆在铝板上的GF表现出优异的耐火性和降低的传热速率。