Acoustic and thermal comfort play an important role in the building environment. This study investigates ultra-lightweight concrete incorporating Miscanthus fibers as lightweight aggregates to improve sound absorption and thermal insulation properties. Miscanthus fibers (MF) is a kind of sound absorption biomass that can dissipate sound noise thanks to its porous and flexible inner structures and fibrous shape. However, its acoustic absorption performance in cement-based materials is rarely investigated. Therefore, the acoustic absorption and thermal insulation of ultra-lightweight Miscanthus concrete (ULMC) is investigated using two different kinds of Miscanthus fibers. Meanwhile other mechanical properties were characterized, including bulk density and flexural strength. Results showed ULMC with 30% 2–4 mm MF obtained an ultra-low density (554 kg/m³), thermal conductivity (0.09 W/(m·K)) and high acoustic absorption coefficient (0.9) at low frequencies. It is found that the acoustic performance of ULMC can be improved by optimizing the dosage and shape of Miscanthus fibers. The developed green and sustainable bio-based ULMC possesses an excellent acoustic absorption and thermal insulation and is very suitable to use as indoor ceiling boards and in non-structural walls to make indoor living environment comfortable and energy-saving.

声学和热舒适性在建筑环境中起着重要作用。这项研究研究了掺入芒草纤维作为轻质骨料的超轻混凝土，以改善吸声和隔热性能。芒草纤维（MF）是一种吸声生物质，由于其多孔，柔软的内部结构和纤维形状，可以消散声音。但是，很少研究其在水泥基材料中的吸声性能。因此，研究了使用两种不同类型的芒草纤维对超轻芒草混凝土（ULMC）的吸声和隔热性能。同时表征了其他机械性能，包括堆积密度和抗弯强度。³），低频率时的导热率（0.09W /（m·K））和高吸声系数（0.9）。发现通过优化芒草纤维的剂量和形状可以改善ULMC的声学性能。先进的绿色可持续生物基ULMC具有出色的吸声和隔热性能，非常适合用作室内天花板和非结构性墙壁，以使室内居住环境舒适且节能。