Bratu, MihaiMihaiBratuDumitrescu, OvidiuOvidiuDumitrescuVasile, OvidiuOvidiuVasileBucur, ElenaElenaBucurDanciulescu, ValeriuValeriuDanciulescu2017-04-062017-04-062014http://hdl.handle.net/123456789/779SISOM & ACOUSTICS 2014This paper aims to introduce new systems for absorption and attenuation of noise based on oxide composite materials made from recycled solid waste. Compared to conventional materials this new type of composites incorporates various wastes that can harm the environment. The absorption coefficient is used to express the capacity of a material to absorb the sound waves. It is expressed in percents and represents the proportion between the total sum of energy that is transmitted and absorbed by the material and the total incidence energy of sound waves. This paper presents several types of composites produced using waste matrix binder. Absorbing capacity of sound for the new composites varies depending on the proportion of waste used. Also, are presented correlations between the grading of the reinforcing material that is used, the density and porosity of the resulted composite and the absorption sound waves coefficient for composite material samples which are reinforced with different wastes.en-USNoiseSound wavesAbsorption coefficientComposite materialsWastesConference Paper