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Rice husk cement-based composites for acoustic barriers and thermal insulating layers

2021; Elsevier BV; Volume: 39; Linguagem: Inglês

10.1016/j.jobe.2021.102297

2352-7102

Beatriz Marques, João Almeida, A. Tadeu, Julieta António, Maria Inês Santos, Jorge de Brito, M.Barra de Oliveira,

Acoustic Wave Phenomena Research

This work evaluates the performance of cement-based composites made with rice husk and intended to be used in acoustic barriers and as thermal insulating material in a multilayer system. Because acoustic barriers are exposed to external conditions and mechanical loads, a wide range of laboratory tests were performed to evaluate the mechanical, durability and acoustic characteristics of the composites. Their specific heat capacity and thermal conductivity were evaluated when used as an insulation layer. Other cement-based composites that incorporate treated wood and rubber granules were studied for comparison purposes. The environmental performance of these new cement-based composites was evaluated by means of a life cycle assessment (LCA). It was found that those that contain rice husk are suitable for coating acoustic barriers, since it offers a good mechanical, durability, and acoustic performance. It was also found that rice husk cement-based composites can be used as thermal insulation layer. The LCA further demonstrated the good performance of the rice husk composites compared with those containing treated wood and rubber granules.