Investigation of loose wood chips and sawdust as alternative sustainable sound absorber materials

Boubel, Ayoub; Garoum, Mohammed; Bousshine, Said; Bybi, Abdelmajid

doi:10.1016/j.apacoust.2020.107639

Cited by 17 publications

(6 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The graph can even be interpreted in the sense that the absorption capacity increases with the increasing thickness at low frequencies at the same time. This result is consistent with previous studies of porous materials that revealed that low-frequency sound absorption has a direct relationship with the thickness [71][72][73]. An increase in the thickness also provides a better absorption of the wave [74].…”

Section: Sound Absorption Coefficientsupporting

confidence: 92%

“…Results showing better absorption with shorter elements were also confirmed in research by [82,83] in the case of bamboo panels, where a higher sound absorption coefficient was obtained with the smaller particle size. The results are also in accordance with the findings of [73]. The authors investigated the dependence of the sound absorption coefficient for redwood classes (chips and sawdust).…”

Section: Sound Absorption Coefficientsupporting

confidence: 88%

See 1 more Smart Citation

Acoustic Properties of Larch Bark Panels

Tudor

Krišťák

Barbu

et al. 2021

Forests

View full text Add to dashboard Cite

The potential of tree bark, a by-product of the woodworking industry, has been studied for more than seven decades. Bark, as a sustainable raw material, can replace wood or other resources in numerous applications in construction. In this study, the acoustic properties of bark-based panels were analyzed. The roles of the particle size (4–11 mm and 10–30 mm), particle orientation (parallel and perpendicular) and density (350–700 kg/m3) of samples with 30 mm and 60 mm thicknesses were studied at frequencies ranging from 50 to 6400 Hz. Bark-based boards with fine-grained particles have been shown to be better in terms of sound absorption coefficient values compared with coarse-grained particles. Bark composites mixed with popcorn bonded with UF did not return the expected results, and it is not possible to recommend this solution. The best density of bark boards to obtain the best sound absorption coefficients is about 350 kg/m3. These lightweight panels achieved better sound-absorbing properties (especially at lower frequencies) at higher thicknesses. The noise reduction coefficient of 0.5 obtained a sample with fine particles with a parallel orientation and a density of around 360 kg/m3.

show abstract

Section: Sound Absorption Coefficientsupporting

confidence: 92%

Section: Sound Absorption Coefficientsupporting

confidence: 88%

Acoustic Properties of Larch Bark Panels

Tudor

Krišťák

Barbu

et al. 2021

Forests

View full text Add to dashboard Cite

show abstract

“…Currently, many sound absorber materials have been intensively studied and commercially mass scale produced. Those are commonly made from nonrenewable sources such as mineral wool, polyurethan and melamine foams, ber glass or glass wool [6], recycle tire rubbers [7−9], wood chip [10], natural bers [11−13], cellulose-based materials [14], and so on. Such materials have high sound absorption coe cient (SAC) but several of those are not environmentally benign.…”

Section: Introductionmentioning

confidence: 99%

Fabrication, Characterization and Application of The Water Hyacinth Biochar- Polyvinyl Alcohol Composite as an Advantageous Sound Absorber Material

Wibawa

Grafiana

Gunawan

2023

Preprint

View full text Add to dashboard Cite

The research was aiming to investigate the potency of water hyacinth (WH) biochar as the most advantageous sound absorber composite when it was blended with polyvinyl alcohol (PVA). Analysis and characterization of the produced WH biochar were essentially performed using N2 absorption-desorption, FTIR spectrophotometer, and SEM methods. While the capability of the sound absorber material was technically conducted using a polyvinylchloride (PVC) impedance tube of about 95 cm in length with internal and outer diameters of about 9.5 cm and 9.8 cm respectively. The materials that would be tested for their capability of sound absorber were prepared in a disk-like form with about 9.5 cm in diameter and 0.5 cm in thickness. The sound source was continuously turned on for 2 minutes and transmitted wirelessly through the impedance tube, and the decreasing intensity of the sound was recorded every 5 seconds. The results showed that the sound absorption coefficient (SAC) of the WH biochar-PVA composite was about 6.50% (0.0650) up to 21.03% (0.2103), while the SAC of the Styrofoam was just about 4.37% (0.0437). This research concluded that the WH biochar produced by the thermal energy of 500oC indicated it could be the best sound absorber composite when it was blended with PVA, especially for a low frequency of about 440 Hz.

show abstract

“…Firstly, the theatre is presented in the state in which it was found by the authors during their first survey; acoustic characterization was conducted both through on-site measurements and via numerical analysis with the EASE 4.4 software. This software is widely used in scientific literature to accurately simulate spaces with different end-uses, including theatres [29][30][31][32][33][34][35][36].…”

Section: Introductionmentioning

confidence: 99%

Experimental Characterization and Acoustic Correction of a Multipurpose Performance Hall: The Italian Theatre “Cavallino Bianco”

et al. 2022

View full text Add to dashboard Cite

This study presents the retrofit acoustic design of the Italian theatre “Cavallino Bianco”. In its historical configuration, the hall had a curved roof with a pressed-plant fiber ceiling, which was demolished and replaced with a wooden roof without a false ceiling, leading to an increase in volume and worsening of the reverberation time. This study proposes the realization of a wave ceiling and the application of sound-absorbing and reflecting panels on the walls, which have already been implemented. These modifications have affected the acoustic characterization of the theatre, as shown both through on-site measurements during the main construction phases and through numerical simulations. The reverberation time, clarity index, and speech transmission index (STI) are evaluated considering all the variations in the hall during its different construction times, and the optimal solution is identified with regard to different specific uses. The final configuration, by reducing the volume of the hall and using sound-absorbing materials, significantly reduces the reverberation time. In addition, the hall at full capacity with chairs and people shows evident improvement to the clarity index, allowing the theatre to be used for a wide range of musical genres such as instrumental, symphonic, and opera.

show abstract

Investigation of loose wood chips and sawdust as alternative sustainable sound absorber materials

Cited by 17 publications

References 20 publications

Acoustic Properties of Larch Bark Panels

Acoustic Properties of Larch Bark Panels

Fabrication, Characterization and Application of The Water Hyacinth Biochar- Polyvinyl Alcohol Composite as an Advantageous Sound Absorber Material

Experimental Characterization and Acoustic Correction of a Multipurpose Performance Hall: The Italian Theatre “Cavallino Bianco”

Contact Info

Product

Resources

About