BUCKWHEAT HUSK AND EPOXY RESIN BASED COMPOSITES FOR NOISE ABATING

The paper discusses promising way of utilization of the buckwheat husks for production of noise abating epoxy based composites for transport infrastructure and buildings industry. Composites of different densities from 400kg/m3 up to 650 kg/m3 have been prepared. The measurements of normal coefficient of sound absorption and sound transmission loss in the range from 500 Hz up to 6400 Нz are carried out. The absorption coefficient posses local maximum depending on the density of composites approaching the value of 0.99 at 3120 Hz for the density 400 kg/m3. The sound transmission loss of composites increases with density from the mean value of 10 dB for 400kg/m3 up to 60 dB for 650 kg/m3 that is comparable with well-developed artificial materials. The pristine buckwheat husks is thermally stable of up to 200-250°С that gives thermogravimetric analysis in the range from 30°С up to 500°С. The husks is suggested as the filler for production of epoxy resin based noise abating composites.