DOMINANT TECHNOLOGIES IN “INDUSTRY 4.0”
Study of sound absorption and reflection coefficients and thermal conductivity of porous composite material obtained from household glass waste and burnt rice grains husks
- 1 Institute of Metal Science, Equipment and Technologies with Hydro-and Aerodynamics Centre “Acad. A. Balevski” at the Bulgarian Academy of Sciences, Sofia, Bulgaria
- 2 Sofia University “St. Kliment Ohridski”, Faculty of Physics, Department of Nuclear Engineering
The coefficients of sound absorption and reflection in the frequency range up to 2 kHz, here respectively 0.2 and 08, as well as the coefficient of thermal conductivity, here below 0.027, of a new porous composite material were studied. The material was obtained from ground household glass waste and rice grains husks burned at temperature from 4000C to 7000C. The results show that the material has good sound reflectivity and low thermal conductivity, which makes it suitable for the manufacture of modules for thermal and sound insulation.
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