Synergistic Effect and Enhancement Mechanism of Foam Concrete Composites by Incorporating Aerogel, Hollow Glass Microspheres and Nano-Silica
Kaihe Dong, Sili Chen, Junxiang Wang, Xinxin Shi, Jingyu Zhang, Jinzhu Meng
TL;DR
This study explores how combining aerogel, hollow glass microspheres, and nano-silica improves foam concrete's strength and insulation while reducing costs.
Contribution
A novel composite design balances thermal efficiency and mechanical strength using low-cost materials in foam concrete.
Findings
4% AG reduced effective porosity by 33% and water absorption by 59%.
4% HGM increased compressive and flexural strength by 13.5% and 19.7%.
2% NS improved compressive and flexural strength by 25.9% and 21.6%.
Abstract
Aerogel-incorporated foam concrete has attracted significant attention in the construction sector owing to its light weight and superior thermal insulation properties. Nevertheless, its practical application in external wall insulation systems is hindered by the high cost of aerogel (AG) and the inherent trade-off between thermal efficiency and mechanical strength. To overcome these limitations, this study introduces a composite design that partially replaces AG with low-cost hollow glass microspheres (HGMs) and incorporates nano-silica (NS) as a strengthening agent. Foam concrete specimens with a constant dry density of 700 kg/m3 were fabricated with these additives. Through an orthogonal experimental approach, the synergistic effects of AG, HGMs, and NS on mechanical properties, porosity, water absorption, and durability were systematically evaluated. The results demonstrated that 4%…
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Taxonomy
TopicsAerogels and thermal insulation · Magnesium Oxide Properties and Applications · Hygrothermal properties of building materials