Abstract
The purpose of this study is to evaluate the acoustic performance of lightweight concrete with ethylene vinyl acetate copolymer (EVA) residues to reduce impact noise on floors. Three types of concrete with three different mix proportions were evaluated. The method adopted includes the characterization of water absorption, voids and density of the samples. The experimental study of noise impact followed the procedures of ISO 140. The results indicate that the lightweight concrete with EVA recycled aggregate can reduce impact noise levels by up to 15 dB and the highest percentage of coarse aggregate EVA does not entail a higher acoustic performance.
Highlights
Lightweight concrete is characterized by the use of lowdensity aggregates with high amount of voids between the particles or by the replacement of solid material by air, which can be achieved through the incorporation of air or foam, or a low specific mass can be achieved producing concrete without fines
The coarse and fine aggregates are considered lightweight when their density is less than 1.120 kg/m3 and greater than 880 kg/m3, respectively (1). These features indicate that the lightweight aggregate can be used for acoustic performance qualification in buildings, especially for the impact noise isolation of floors
The noise in buildings can spread through the air, the airborne noise, or through the structures themselves, defined as impact noise
Summary
The low density of the mixture is achieved due to the use of lightweight aggregates which produces specific characteristics such as low density, ranging from 300 kg/m3 to 1.800 kg/m3 and compressive strength, ranging from 0.3 MPa to 40 MPa. The coarse and fine aggregates are considered lightweight when their density is less than 1.120 kg/m3 and greater than 880 kg/m3, respectively (1). The coarse and fine aggregates are considered lightweight when their density is less than 1.120 kg/m3 and greater than 880 kg/m3, respectively (1) These features indicate that the lightweight aggregate can be used for acoustic performance qualification in buildings, especially for the impact noise isolation of floors. The impact noise is produced by percussion of solid bodies on a floor, transmitted through the structure and re-radiated by it into the air The impact noise is produced by percussion of solid bodies on a floor, transmitted through the structure and re-radiated by it into the air (e.g. falling objects, footsteps, hammering, percussion instruments, etc. (2)
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