Qu Wanying, Liu Kailu, Zeng Haoyang, Hu Qiuyan, Wang Li
School of Urban Construction, Wuhan University of Science and Technology, Wuhan, Hubei Province 430065, China.
College of Resources and Environment Engineering, Wuhan University of Science and Technology, Wuhan, Hubei Province 430081, China.
Sci Rep. 2025 Mar 30;15(1):10945. doi: 10.1038/s41598-025-96026-2.
To enhance the insulation performance, strength, and fire resistance performance of foamed concrete, this paper investigates the effects of incorporating nano-silica aerogel and expanded perlite. A comprehensive comparison and analysis were conducted on the dry density, water absorption, mechanical performance, thermal conductivity, fire-resistant insulation, and microstructure of both Nano-SiO Aerogel Foamed Concrete (NSAFC) and Expanded Perlite Foamed Concrete (EPFC). The findings indicate that as the Nano-SiO Aerogel (NSA) content increases, the water absorption of the foamed concrete gradually rises. Conversely, the water absorption of the foamed concrete test blocks first increases and then decreases with an increase in Expanded Perlite (EP) content. It is noteworthy that, incorporating 10% NSA and EP reduces the dry density of foamed concrete by 12.7% and 7.8%, respectively. When EP content reaches 6%, the 28-d flexural and compressive strengths of the foamed concrete test blocks increase by 73.5% and 54.2%, respectively. Similarly, at NSA content of 6%, the 28-d flexural and compressive strengths increase by 70.5% and 39.6%, respectively. The fire-resistant insulation tests demonstrate that NSAFC exhibits superior thermal insulation and fire resistance performance compared to EPFC. Furthermore, SEM images demonstrate that the pore structure of NSAFC is more uniform.
为提高泡沫混凝土的保温性能、强度和耐火性能，本文研究了掺入纳米二氧化硅气凝胶和膨胀珍珠岩的效果。对纳米二氧化硅气凝胶泡沫混凝土（NSAFC）和膨胀珍珠岩泡沫混凝土（EPFC）的干密度、吸水率、力学性能、导热系数、耐火保温性能和微观结构进行了全面的比较和分析。研究结果表明，随着纳米二氧化硅气凝胶（NSA）含量的增加，泡沫混凝土的吸水率逐渐升高。相反，随着膨胀珍珠岩（EP）含量的增加，泡沫混凝土试块的吸水率先增加后降低。值得注意的是，掺入10%的NSA和EP分别使泡沫混凝土的干密度降低了12.7%和7.8%。当EP含量达到6%时，泡沫混凝土试块的28天抗折强度和抗压强度分别提高了73.5%和54.2%。同样，当NSA含量为6%时，28天抗折强度和抗压强度分别提高了70.5%和39.6%。耐火保温试验表明，与EPFC相比，NSAFC具有更好的保温和耐火性能。此外，扫描电子显微镜图像表明，NSAFC的孔隙结构更均匀。
