• Lucian Paunescu Daily Sourcing & Research SRL Bucharest
  • Sorin Mircea Axinte University POLITEHNICA of Bucharest
  • Marius Florin Dragoescu University POLITEHNICA of Bucharest
  • Felicia Cosmulescu Cosfel Actual SRL Bucharest
  • Bogdan Valentin Paunescu Consitrans SA Bucharest
Keywords: glass foam, microwave heating, glass waste, glycerol, sodium silicate, calcium carbonate


A glass foam with typical characteristics for a foam glass gravel usable as a thermal insulating material in difficult climatic conditions and with mechanical stress was made by sintering at 834 ºC a powder mixture composed of colorless glass waste  (93.1 wt.%), glycerol (1.0 wt.%), sodium silicate (4.8 wt.%), calcium carbonate (0.8 wt.%), kaolin (0.2 wt.%) and water addition  (14.5 wt.%). The physical, thermal, mechanical and morphological characteristics of the product were: apparent density of 0.28 g/cm3, porosity of 86.67%, thermal conductivity of 0.063 W/m·K, compressive strength of 7.3 MPa, water absorption of 4.3% and pore size between 0.10-0.35 mm. The specific energy consumption of the manufacturing process was 0.78 kWh/kg. The originality of the work is the use of a nonconventional heating technique based on the microwave energy.  


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How to Cite
Paunescu, L., Axinte, S., Dragoescu, M., Cosmulescu, F., & Paunescu, B. (2021). SIMULTANEOUS USE OF LIQUID AND SOLID FOAMING AGENTS BY A NONCONVENTIONAL TECHNIQUE TO OBTAIN A HIGH-STRENGTH GLASS FOAM WITH FINE POROSITY. Nonconventional Technologies Review, 25(2). Retrieved from

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