FOAM GLASS GRAVEL FROM RECYCLED GLASS WASTE PRODUCED WITH THE MICROWAVE ENERGY

Lucian Păunescu; Marius Florin Drăgoescu; Sorin Mircea Axinte

Lucian Păunescu Daily Sourcing & Research SRL
Marius Florin Drăgoescu Daily Sourcing & Research SRL
Sorin Mircea Axinte Daily Sourcing & Research SRL

Keywords: foam glass gravel, microwave, calcium carbonate, borax, sodium silicate, compressive strength

Abstract

The results of the research in the field of microwave energy application in the process of manufacturing foam glass gravel from colored glass waste, calcium carbonate as a foaming agent, borax as a fluxing agent and sodium silicate solution as a binder are presented in the paper. The thermal process of sintering/ foaming the powder mixture was carried out in a 0.8 kW-domestic microwave oven adapted for high temperature operation. The foamed product at 845 ºC, with 1.5% calcium carbonate, 7% borax and 8% sodium silicate, reached the highest value of compressive strength (9.5 MPa), thermal conductivity 0.105 W/ m·k, apparent density 0.80 g/ cm³ and a homogeneous distribution of pores in the material structure with dimensions below 1 mm.

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