Noise Pollution Mitigation Study of Rice Husk-Ash Nanoparticle Reinforced Epoxy Resin Composites

Abstract

The menace of noise pollution to human health, knowledge dissemination and tranquil environment continues to increase daily. This is not unconnected with industrialisation and multiplicity of human activities hence the need for the development of eco-friendly materials capable of drastically reducing noise pollution. In this study, epoxy resin composites were synthesised using rice husk ash nanoparticles (RHANP) as reinforcement varied from 5-25 wt. %. The composites were characterised for acoustic capabilities and the results show desirable sound absorption of up to 71.6% sound decibel mitigation at 5-15 wt. % RHANP addition. This was demonstrated by the Noise Reduction Coefficient (NRC) of the composites in the range of 0.654-0.805 at sound frequencies of 2-6 kHz. This compare well with most conventional acoustic panels installed on the ceiling of hospitals, conference centres and lecture theatres. The composites were also characterised for relevant handling mechanical properties required to guarantee damage-free installation. The outcomes indicate 35.8 MPa flexural strength, 4.3 J impact energy and hardness of 25.1 HV. These levels of mechanical properties are adjudged sufficient for safe handling and durability in service. The contributions of the study will significantly impart comfortability at facilities such as hospitals and libraries that are prone to noise pollution. Furthermore, the outcomes of the study have the potential to engender cleaner environment, value addition and a boost to the nation’s Gross Domestic Product (GDP).