스테아레이트계 발포안정제가 도시 생활 쓰레기 소각 비산재 혼입 발포 지오폴리머의 공학적 성능에 미치는 영향 = Effects of Stearate-based Foam Stabilizers on the Performance of Foamed Geopolymers incorporating Municipal Solid Waste Incineration Fly Ash

다국어 초록 (Multilingual Abstract)

The foamed geopolymer incorporating municipal solid waste incineration fly ash (MSWIFA) tend to generate macroscopic voids due to their low viscosity and the low interfacial tension of bubbles, both of which negatively impacts its thermal insulation performance. To address this issue, various types of hydrophobic stearates were incorporated as foam stabilizers to control the pore distribution in the MSWIFA-based foamed geopolymer. The physical properties such as fluidity, expansion rate, compressive strength, porosity, and thermal conductivity were measured. Stearate ions dissolved in the geopolymer matrix increased viscosity and formed a hydrophobic stabilizing film on the bubble walls, thereby enhancing pore stability. As a result, both expansion rate and porosity increased, while compressive strength decreased. However, the increased porosity led to a reduction in thermal conductivity, thereby improving insulation efficiency. Improvements in both physical and thermal properties were observed with increasing hydrophobicity of the stearates. Among the tested stabilizers, zinc stearate(ZS), which exhibited the highest hydrophobicity, was identified as the most efficient foam stabilizer for MSWIFA-based foamed geopolymers.