Unconventionally Made-Cellular Glass Aggregate

  • Lucian Paunescu Daily Sourcing & Research SRL Bucharest, Romania
  • Sorin Mircea Axinte Department of Applied Chemistry and Materials Science, University “Politehnica” of Bucharest, Romania
  • Felicia Cosmulescu Cosfel Actual SRL Bucharest, Romania
Keywords: Cellular Glass Aggregate, Residual Glass, Calcium Carbonate, Borax, Microwave Heating


Improving the original manufacturing process in microwave field of a cellular glass aggregate using a recipe containing colored consumed drinking bottle, calcium carbonate (CaCO3) as an expanding agent, sodium borate (borax) as a fluxing agent and sodium silicate (Na2SiO3) as a binder is shown in the work. The main adopted technological measures were the advanced mechanical processing of residual glass at a grain dimension below 100 μm and especially the use of a high electromagnetic wave susceptible ceramic tube with a wall thickness reduced from 3.5 to 2.5 mm for the protection of the pressed glass-based mixture against the aggressive effect of microwave field and, in the same time, to achieve a preponderantly direct heating with electromagnetic waves. Of the tested variants, a recipe with 1.6 % calcium carbonate, 6 % borax, 8 % sodium silicate and the rest residual glass was determined to be optimal. The cellular glass aggregate had the bulk density of 0.22 g/cm3, heat conductivity of 0.079 W/m·K and compression strength of 5.9 MPa. The specific consumption of energy was very low (0.71 kWh/kg) below the range of reported values of the industrial processes consumption (between 0.74-1.15 kWh/kg).



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How to Cite
Paunescu, L., Axinte, S. M., & Cosmulescu, F. (2021). Unconventionally Made-Cellular Glass Aggregate. Journal La Multiapp, 2(6), 21-31. https://doi.org/10.37899/journallamultiapp.v2i6.511