• Lucian Paunescu Daily Sourcing & Research SRL Bucharest
  • Marius Dragoescu University POLITEHNICA of Bucharest
  • Sorin Mircea Axinte University POLITEHNICA of Bucharest
  • Felicia Cosmulescu Cosfel Actual SRL Bucharest
Keywords: glass foam, microwave heating, high mechanical strength, thermal insulating material, efficiency energy


The paper presents results of research in the manufacturing domain of some glass foams with thermal insulating characteristics (apparent density of 0.50 g/cm3, porosity of 76.2% and thermal conductivity of 0.149 W/m·K) and with a very high compressive strength (16.6 MPa). The product was achieved by sintering at 853 ºC of a pressed mixture composed from 78.2% container glass waste, 1.0% sodium carbonate, 2.0% glycerol, 7.8% sodium silicate and 11.0% water. The adopted heating technique was the predominantly direct microwave heating in a 0.8 kW-microwave oven, which allowed to obtain a low specific energy consumption of 1.10 kWh/kg.


1. Paunescu, L., Dragoescu, M.F., Axinte, S.M., Paunescu, B.V., Dense glass foam produced in microwave field, Journal of Engineering Studies and Research, Vol. 24, No. 1, pp. 1-7, (2018).
2. Cosmulescu, F., Paunescu, L., Dragoescu, M.F., Axinte, S.M., Comparative analysis of the foam glass gravel types experimentally produced by microwave irradiation, Journal of Engineering Studies and Research, Vol. 26, No. 3, pp. 58-68, (2020).
3. Sooksaen, P., Sudyod, N., Thongtha, N., Fabrication of lightweight foam glasses for thermal insulation applications, Materials Today: Proceedings, Vol. 17, Part 4, pp. 1823-1830, (2019).
4. Paunescu, L., Dragoescu, M.F., Axinte, S.M., High mechanical strength cellular product as a construction material manufactured in microwave field, Nonconventional Technologies Review, Vol. 24, No. 2, pp. 64-69, (2020).
5. Dragoescu, M.F., Paunescu, L., Axinte S.M., Nonconventional technique of sintering/foaming the glass waste using a liquid carbonic foaming agent, Nonconventional Technologies Review, Vol. 24, No. 3, pp. 4-12, (2020).
6. Yatsenko, E.A., Goltsman, B.M., Smoliy, V.A., Kosarev, A.S., Investigation of a porous structure formation mechanism of a foamed slag glass based on the glycerol foaming mixture, Research Journal of Pharmaceutical, Biological and Chemical Science, Vol. 7, No. 5, pp. 1073-1081, (2016).
7. Karandashova, N.S., Goltsman, B.M., Yatsenko, E.A., Analysis of influence of foaming mixture components on structure and properties of foam glass, IOP Conference Series: Materials Science and Engineering, Vol. 262, (2017).>article>262
8. Scarinci, G., Brusatin, G., Bernardo, E., Cellular Ceramics: Structure, Manufacturing, Properties and Applications, Wiley-VCH GmbH & KGaA, Weinheim, Germany, Scheffler, M., Colombo, P. eds., pp. 158-176, (2005).
9. Karunadasa, K.S.P., Manoratne, C.H., Pitawala, H.M.T.G.A., Rajapakse, R.M.G., Thermal decomposition of calcium carbonate (calcite polymorph) as examined by in-situ high-temperature X-ray powder diffraction, Journal of Physics and Chemistry of Solids, Vol. 134, pp. 21-28, (2019).
10. Kim, J.W., Lee, H.G., Thermal and carbothermic decomposition of Na2CO3 and Li2CO3, Metallurgical and Materials Transactions B, Vol. 32, pp. 17-24, (2001).
11. Glass composition. Glass types.
12. Manual of weighing applications, Part 1- Density, (1999).
13. Anovitz, L.M., Cole, D.R., Characterization and analysis of porosity and pore structures, Reviews in Mineralogy and Geochemistry, Vol. 80, pp. 61-164, (2005).
How to Cite
Paunescu, L., Dragoescu, M., Axinte, S., & Cosmulescu, F. (2021). THERMAL INSULATING GLASS FOAM WITH HIGH MECHANICAL STRENGTH MADE BY MICROWAVE RADIATION. Nonconventional Technologies Review, 25(1). Retrieved from

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