Bio-based ultra-lightweight concrete applying Miscanthus fibers: Acoustic absorption and thermal insulation  

Yuxuan Chen, Fan Wu, Q.L. (Qingliang) Yu (Corresponding author), H.J.H. (Jos) Brouwers

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Abstract

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/m 3), 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.

Original languageEnglish
Article number103829
Number of pages12
JournalCement & Concrete Composites
Volume114
DOIs
Publication statusPublished - Nov 2020

Funding

This research is supported by E.U.-Stimulus project “3-D printable bio-concrete containing Miscanthus” and the China Scholarship Council (CSC) Fund (Grant No. 201706950053 and No. 201806240037). Vibers (the Netherlands) and ENCI (the Netherlands) are thanked for providing materials. Dip. Min. K. Schollbach and MSc. Yi Qin are acknowledged for the fruitful discussions and advices during this research, and MSc. Briere de la Hosseraye is acknowledged for the experimental support on acoustic absorption test. This research is supported by E.U.-Stimulus project “3-D printable bio-concrete containing Miscanthus ” and the China Scholarship Council (CSC) Fund (Grant No. 201706950053 and No. 201806240037 ). Vibers (the Netherlands) and ENCI (the Netherlands) are thanked for providing materials. Dip. Min. K. Schollbach and MSc. Yi Qin are acknowledged for the fruitful discussions and advices during this research, and MSc. Briere de la Hosseraye is acknowledged for the experimental support on acoustic absorption test.

FundersFunder number
ENCI
China Scholarship Council201706950053, 201806240037

    Keywords

    • Acoustic absorption
    • Lightweight concrete
    • Miscanthus
    • Thermal insulation

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