Improvement of the Acoustic Attenuation of Plaster Composites by the Addition of Short-Fibre Reinforcement

P Kulhavý,M Petru,A Samková,M Pechociakova

doi:10.1155/2018/7356721

P Kulhavý, M Petru + Show 2 more

Open Access

https://doi.org/10.1155/2018/7356721

Copy DOI

Abstract

Noise attenuation is a key contemporary issue associated with the protection of human health. In this study, the possibilities of affecting acoustic properties of plaster composites by the addition of short-fibre reinforcement are described. The improvement of attenuation abilities was first verified using a simple numerical model with a pure plaster followed by using a reinforced plaster. The model results revealed a mutual correlation between the fibre ratio and dissipated acoustic energy. Hence, typical plasters used in the building industry (e.g., plaster, lime cement, and cement) are used as the base materials of the tested composites. The reinforcing dispersion in the form of short fibres (basalt and glass) with a defined length was selected after evidence from previously reported studies and after the comparison of some other fibres with respect to the trade-off between the rendered mechanical properties and cost. Transfer functions of the tested samples were measured using an impedance tube with two microphones, followed by the calculation of the total acoustic absorption. On the other hand, cement and plaster materials exhibited a low damping ability, and the absorption could be considerably increased by the addition of fibres, especially in the area around 1 kHz. In contrast, the UM plaster exhibited good damping properties even without the dispersion, and the addition of improper fibres such as glass ones possibly worsened the properties. The acoustic attenuation of the plaster composites can be improved by the appropriate combination of the base material and fibre dispersion. However, it is not possible to generalise this improvement for all possible combinations.

Highlights

The enormous technological development could be observed in a lot of everyday life sectors such as transport and other industries
Laws regulating noise levels are valid in several countries [4]
Pedreño-Rojas et al have added some recycled wood to the gypsum matrix [10]. eir experiments revealed that by increasing the percentage of the added wood waste, the mass of the new material decreases while simultaneously improving its thermal and sound absorption properties. eir group has revealed that the best results are achieved by the addition of up to 10%–20% of wood shavings or sawdust composites

Summary

Introduction

The enormous technological development could be observed in a lot of everyday life sectors such as transport and other industries. Erefore, parts such as walls and roofs of buildings, which constitute the main parts of a residential or industrial object require materials with a high absorption coe cient such as wool glass, foam, mineral wools, or their composites [9]. Various products such as chopped bres, grids, steel truss, rovings, and veils can improve the mechanical and acoustic properties of the main building materials. Pedreño-Rojas et al have added some recycled wood to the gypsum matrix [10]. eir experiments revealed that by increasing the percentage of the added wood waste, the mass of the new material decreases while simultaneously improving its thermal and sound absorption properties. eir group has revealed that the best results (with respect to the acoustic and mechanical properties) are achieved by the addition of up to 10%–20% of wood shavings or sawdust composites

Methods

Results

Conclusion