An Experimental Comparison of Airborne Sound Insulation between Dovetail Massive Wooden Board and Cross-Laminated Timber Elements
Abstract
:1. Introduction
- Pure wood composition: Unlike conventional EWPs that heavily rely on adhesives derived from petroleum, the DMWBE features a composition of pure wood. This characteristic is a groundbreaking departure from the traditional use of adhesives, reducing the environmental hazards associated with petroleum-based materials.
- Absence of adhesive and metal connections: The DMWBE sets itself apart by entirely eliminating the need for adhesive and metal connections. This innovation not only contributes to improved environmental sustainability but also simplifies end-of-life disposal and enhances reusability, addressing a key challenge in the industry.
- Performance evaluation: The research introduces a rigorous comparative analysis, which, to the best of our knowledge, has not been extensively explored in the existing literature. It examines the performance of the DMWBE in terms of airborne sound insulation, a critical property in building parts. The use of standardized ISO 10140-2 testing protocols ensures the reliability and repeatability of the results.
2. Materials and Methods
2.1. Test Specimens
2.1.1. Dovetail Test Specimen
2.1.2. CLT Test Specimen
2.2. Mounting of Test Specimens
2.3. Measurement Arrangements
2.3.1. Sound Insulation Measurements
2.3.2. Measurements of TLF
2.3.3. Other Measurements
3. Results and Discussion
3.1. Airborne Sound Insulation and Loss Factor
- Structural composition: While the mass per unit area, specimen sizes, installation conditions, and raw materials used for both DMWBE and CLT panels were quite similar, the crucial distinction lies in the composition of the panel structures. This composition directly impacts the mechanical and damping properties of the panels.
- Timber lamella profiles and connection methods: The different fabrication techniques used in the DMWBE and CLT panels resulted in variations in the elastic moduli of the specimens. This affected the bending stiffness, sound insulation, and coincidence frequencies (fc) of the panels. Moreover, the absence of adhesives in DMWBE played a significant role in enhancing the damping of the panel, leading to superior sound reduction indices at least above 500 Hz.
3.2. Limitations and Need for Further Research
3.3. Practical Implementations of the Research
- (a)
- Environmental sustainability: By introducing DMWBEs with their pure wood composition and the absence of adhesives or metal connections, the research aligns with the increasing global emphasis on sustainable and eco-friendly construction materials. This makes DMWBEs a practical choice for environmentally conscious construction projects.
- (b)
- Improved sound insulation: The research highlights the superior sound insulation properties of DMWBEs. This is particularly relevant for applications where noise control is crucial, such as residential buildings, offices, and public spaces. The practical implication is that DMWBEs can be effectively used to create quieter and more comfortable indoor environments.
- (c)
- Simplified end-of-life disposal and reusability: DMWBEs’ design simplifies the disposal and reusability of construction materials. This practical aspect can significantly reduce the environmental impact of construction projects and contribute to more sustainable building practices.
- (d)
- Versatility in construction: Understanding the enhanced performance of DMWBEs in terms of sound insulation expands their potential applications. Practical implementations can include using DMWBEs in walls, ceilings, or floors to enhance acoustic performance and create better living and working spaces.
- (e)
- Reduced material complexity: The elimination of adhesives and metal connections simplifies the manufacturing process and may lead to cost savings in production. This practical advantage can make DMWBEs an economically viable choice for construction projects.
4. Conclusions
- (1)
- Absence of adhesives and enhanced damping: One of the key factors contributing to the superior sound insulation performance of DMWBEs is the absence of adhesives in their composition. As known, adhesives in traditional construction materials can introduce stiffness and reduce internal losses in structures, leading to less effective sound insulation. In contrast, DMWBEs’ pure wood composition lacks these adhesives, allowing for increased internal losses within the panel. This enhanced damping is likely due to the presence of small air gaps between individual boards comprising the DMWBE panel. These gaps create opportunities for panel vibration to be dissipated within the structure, thus improving its sound insulation properties. However, the small air gaps between the boards themselves can also contribute to the sound insulation of the DMWBE panel.
- (2)
- Structural and acoustic implications: The elevated structural damping in the DMWBE is of particular significance in its sound insulation performance. When sound waves pass through the panel, the increased damping within the DMWBE leads to a greater sound transmission loss of the structure. These structural and acoustic implications underline the effectiveness of DMWBEs as a sound-insulating material.
Author Contributions
Funding
Data Availability Statement
Acknowledgments
Conflicts of Interest
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Room temperature | 21.8 °C |
Relative humidity | 43% |
Source room volume | 201 m3 |
Receiving room volume | 71 m3 |
Single-Number Quantity | DMWBE | CLT |
---|---|---|
Rw | 43 dB | 40 dB |
Rw + C | 42 dB | 39 dB |
Rw + Ctr | 39 dB | 37 dB |
Rw + C100–5000 | 43 dB | 40 dB |
Rw + C50–3150 | 42 dB | 39 dB |
Rw + C50–5000 | 43 dB | 40 dB |
Rw + Ctr,100–5000 | 39 dB | 37 dB |
Rw + Ctr,50–3150 | 39 dB | 37 dB |
Rw + C50–5000 | 39 dB | 37 dB |
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Ilgın, H.E.; Lietzén, J.; Karjalainen, M. An Experimental Comparison of Airborne Sound Insulation between Dovetail Massive Wooden Board and Cross-Laminated Timber Elements. Buildings 2023, 13, 2809. https://doi.org/10.3390/buildings13112809
Ilgın HE, Lietzén J, Karjalainen M. An Experimental Comparison of Airborne Sound Insulation between Dovetail Massive Wooden Board and Cross-Laminated Timber Elements. Buildings. 2023; 13(11):2809. https://doi.org/10.3390/buildings13112809
Chicago/Turabian StyleIlgın, Hüseyin Emre, Jesse Lietzén, and Markku Karjalainen. 2023. "An Experimental Comparison of Airborne Sound Insulation between Dovetail Massive Wooden Board and Cross-Laminated Timber Elements" Buildings 13, no. 11: 2809. https://doi.org/10.3390/buildings13112809