Comparison of the soundproofing characteristics of olive stone filled polypropylene, gypsum boards and wood fiber reinforced polypropylene

Abstract

[EN] Noise, caused by the society and technic progress, is nowadays considered a pollutant. Noise pollution affects or could affect a great number of people. One the most concerned fields, in part by a growing law framework, and the quality expectations of the clients, is architecture. The solution to sound pollution involves eliminating it or reducing it to acceptable levels. Nowadays, one of the most recurred solutions is the use of lightweight materials as gypsum boards, to create acoustic insulation elements. On the other hand, the environmental awareness has increased the attention towards recycled materials. In the case of composite materials a major attention has been devoted to the substitution of mineral reinforcements, as glass fibers, by more sustainable reinforcements, as wood fibers or agroforestry wastes. In that sense, olive stones are a byproduct of olive oil extraction. In that work, olive stone filled polypropylene composites were prepared. Different percentages of filler were used. The soundproofing properties of the composites were tested by means of an impedance tube. Then, the results were compared with that of gypsum boards, wood veneer and wood fiber reinforced polypropylene.