Control of the Structure and Properties of Acoustic Materials on the Basis of Foam Glass Composites

An approach to the creation of effective acoustic glass composites is presented. Sound-absorbing properties of materials with a rigid frame depend on the type and size of pores on the surface and the volume of communicating pores in the material body. The porous structure of the material is investigated. It is shown that the nature of the pore size distribution curve and the sound absorption curve are similar. Pore size is associated with the sound frequency, the largest contribution to the sound absorption of the material is made by pores of 200–250 μm and 450 μm. The dependence between water absorption and acoustic characteristics is obtained. The sound absorption coefficient reaches the extreme point at the value of water absorption of samples in the range of 35–45%, with further increase in water absorption, a gradual decrease in the sound absorption coefficient is observed. The lower and upper dimensional thresholds of acoustically active pores, the number of open (communicating) porosity in the material, when reaching the maximum values of the sound absorption coefficient, are established. The basic requirements for optimal structures making it possible to achieve the required acoustic performance of the material are determined.

V.S. LESOVIK¹, Doctor of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.),
S.V. ALEKSEEV¹, Candidate of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.);
I.V. BESSONOV², Candidate of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.); S.S. VAISERA1, Engineer (This email address is being protected from spambots. You need JavaScript enabled to view it.) 

1 Belgorod State Technological University named after V.G. Shukhov (46, Kostyukova Street, Belgorod, 308012, Russian Federation) 
2 Scientific-Research Institute of Building Physics of the Russian Academy architecture and construction sciences (21, Lokomotivniy Driveway, Moscow,127238, Russian Federation)

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