Work

Making Fine-Porosity Thermal Insulation-Microwave Assisted

Year: 2025

Type: article

Abstract: Fine-porosity glass foam was made from ground recycled waste glass, using sodium hydroxide dissolved in distilled water, borax, and titanium dioxide as additives. The dry mixture was heated for sintering at 810-825℃ in a constructively and operationally adapted microwave oven, heating times being varied between 27-60 min. The proportion of NaOH was increased from 4.5 to 9%, so that the NaOH/borax ratio had values between 0.75-1.50. The experiments allowed the identification of the optimal NaOH/borax ratio (1.25), so that the characteristics of the appropriate specimen were: density of 0.14 g·cm-3, porosity of 89.6%, heat conductivity of 0.042 W·m-1·K-1, and compression strength of 1.2 MPa. The pore size was very low (between 40-80 µm), obtaining a structure with predominant closed-porosity.

Source: Zenodo (CERN European Organization for Nuclear Research)

DOI: 10.5281/zenodo.15617753

Authors: PĂUNESCU, LUCIAN, AXINTE, SORIN MIRCEA

Institution: Universitatea Națională de Știință și Tehnologie Politehnica București

Language: English

Topic: Recycling and utilization of industrial and municipal waste in materials production

Subfield: Building and Construction

Field: Engineering

Domain: Physical Sciences

SDG: Responsible consumption and production

Open Access status: green

OpenAlex ID: W6911807285

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