New sound absorbent composite materials based on sawdust and polyurethane foam

Tiuc, Ancuţa Elena; Nemeș, Ovidiu; Vermeșan, Horațiu; Toma, Adina Cristina

doi:10.1016/j.compositesb.2018.11.103

Cited by 87 publications

(51 citation statements)

References 28 publications

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“…The diagrams of the sound absorption coefficients on a frequency range from 0 to 6400 Hz are presented in Figure 11b. The capacity of a material to absorb the sound is defined by the type of binder, its percentage, the size of the raw materials and the thickness of the new material [75]. The data obtained after the measurements, shown in Figure 11b, showed that the maximum value of sound absorption from the three composites is around 0.35 on a frequency of around 1500 Hz, for M3.…”

Section: Acoustic Propertiesmentioning

confidence: 99%

Experimental Investigations on the Performances of Composite Building Materials Based on Industrial Crops and Volcanic Rocks

2020

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Interdisciplinary and sustainability represent the main characteristics of this paper due to the fact that this research is offering a connection between two main areas-agronomy and construction, by using hemp shiv for the design of new building materials, which can increase the sustainability level of the building industry. For this reason, the main scope of this study is based on the investigation of a new category of composite building materials-lightweight mortars based on hemp shiv, volcanic rocks and white cement-which contribute to a positive environmental impact and help to increase indoor comfort. A complex report was carried out on two segments. The first one is focused upon the characteristics of the raw materials from the composition of the new materials, while the second segment presents a detailed analysis of these composites including morphological and chemical investigation, pyrolytic and fire behavior, compression and flexural strengths, and acoustic and thermal characteristics. The proposed recipes have as a variable volcanic rocks, while the hemp and the binder maintain their volumes and properties. The results were analyzed according to the influence of volcanic rocks on the new composites.Crystals 2020, 10, 102 2 of 21 consideration in the construction sector. There is a significant number of studies on hemp shiv with lime, which is a composite material named hempcrete [12][13][14], but there are only few studies that concern hemp shiv with cement [15][16][17][18][19].Due to the fact that hemp shiv presents poor fire resistance, a new approach can be made with volcanic rocks, which are natural products with higher fire resistance [20]. These materials are usually found in the composition of mortars used in the rehabilitation process of the walls, because of their increased mechanical resistances [21]. They also present sound and thermal properties, as well as a low density, which will help the workability of the mortar. Durable and with higher strength properties for structural application [20], volcanic rocks are low cost materials [22] that also present fire retarding properties for steel structures [23].Therefore, the purpose of this paper is to analyze the impact of the volcanic rocks when these are incorporated in hemp-cement composite materials used as interior mortars. These building materials are developed to be suitable not only for eco-friendly construction but also in regular buildings made from concrete, steel, and so forth, where they can increase indoor comfort. Materials and Methods Raw MaterialsThe composition of the new materials is designed to increase indoor comfort by developing new types of lightweight mortars, obtained as prefabricated plates. In order to understand the characteristics of the new composites, hemp shiv, natural and treated; volcanic rocks, perlite and vermiculite; and binders, white cement and hydrated lime, were analyzed. Hemp ShivThe hemp shiv used for the new composites was received from HempFlax Romania (Pianu De Jos, Alba, Romania). The chemical stru...

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Section: Acoustic Propertiesmentioning

confidence: 99%

Experimental Investigations on the Performances of Composite Building Materials Based on Industrial Crops and Volcanic Rocks

2020

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“…This research seeks to study the adsorption capability of sawdust from selected local woods. Sawdust is a waste generated from various sawmills across the country, it is mostly disposed of in the environment thereby causing pollution (Braz et al, 2019;Kebibeche et al, 2019;Raheem and Ige, 2019;Tiuc et al, 2019;. Hence using sawdust as an adsorbent for hydrocarbon clean up could enhance the eradication of the menace associated with saw dust waste in the long run and help to sustain the ecosystem (Mohsen, 2007;Idris et al, 2014., Ikenyiri andUkpaka, 2014).…”

Section: Introductionmentioning

confidence: 99%

Characterization and physicochemical properties of wood sawdust in Niger area, Nigeria

Int¹

2019

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Investigation was carried out to examine the characterization and physicochemical properties of some wood sawdust obtained from Niger Delta Area of Nigeria limited for the purpose of usage as an absorbent for remediation of contaminant in soil environment. Experimental examination was conducted on value, moisture content, bulk density and porosity, iodine number and ash content for the various wood sawdust samples from Obuba and Abura, Opepe/mahogany. The result obtained revealed that the pH value of Obuba red (soft wood) is 5.48, Abura (hard wood) 6.18, opepe/mahogany (hard wood) 5.75 and iroko (soft wood) 5.29, whereas the moisture content value opepe/mahogany and iroko. The result further revealed that the bulk density and the porosity value are as presented, grain volume value are 2.910, 2.475, 1.931, and 2.959, bulk density value are 1.0317, 0.884, 0.2190, 0.4306, 0.5490, and 0.3499 for obuba red, abura, opepe/mahogany and iroko. The iodine number tested demonstrates the following value of 10.20, 6.90, 13.90 and 5:9 and 6.6 for obuba red, abura, opepe/mahogany and iroko. Finally, it was demonstrated that the usefulness of characterization and examination of physicochemical properties of functional components that control and improve the monitoring, predicting and determination of the kinetics values.

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“…Su et al [9] investigated influences of the acoustic characteristic parameters to sound absorption properties of the multilayer composite made of glass, wool, glue, and polyurethane foam, which indicated that influences of the outer material were more obvious than that of the inner material. These achievements on influences of the acoustic characteristic parameters to sound absorption performance of the polyurethane foam proved that identification and optimization were critical procedures to develop a novel sound absorber from the polyurethane foam for practical application in the noise reduction.For the purpose of further improving sound absorption performance of the polyurethane foam, the composite sound-absorbing structure was proposed, which included the polyurethane foam and other sound-absorbing materials [10][11][12][13][14]. Barium titanate/nitrile butadiene rubber and polyurethane foam were combined to form a sound absorbing material with alternating multilayered structures by Jiang et al [10], which gained excellent low-frequency sound absorption performances due to the organic combination of the airflow resistivity, resonance absorption, and interface dissipation.…”

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confidence: 99%

“…Barium titanate/nitrile butadiene rubber and polyurethane foam were combined to form a sound absorbing material with alternating multilayered structures by Jiang et al [10], which gained excellent low-frequency sound absorption performances due to the organic combination of the airflow resistivity, resonance absorption, and interface dissipation. Tiuc et al [11] developed new composite materials based on sawdust as reinforcing material and polyurethane foam as a binder agent, and their sound absorption coefficients were over 0.5 in the large frequency range. The rigid polyurethane foam and panel were combined to form the rigid foam composites by Peng et al [12], and excellent sound absorption was obtained when the aluminum hydroxide was 20 wt%.…”

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confidence: 99%

“…Acoustic properties of the polyurethane foam with the addition of bamboo leaves particles were investigated by Chen and Ji [14], the results of which obtained the best sound insulation with high transmission loss around 18.9 dB over the entire frequency range of 100-6300 Hz. Although these composite structures developed from the original polyurethane foam achieved better sound absorption performance [10][11][12][13][14], their fabrication processes were complex, which indicated that the fabrication costs were increased. Moreover, these…”

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Improving and Optimizing Sound Absorption Performance of Polyurethane Foam by Prepositive Microperforated Polymethyl Methacrylate Panel

et al. 2020

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Sound absorption performance of polyurethane foam could be improved by adding a prepositive microperforated polymethyl methacrylate panel to form a composite sound-absorbing structure. A theoretical sound absorption model of polyurethane foam and that of the composite structure were constructed by the transfer matrix method based on the Johnson–Champoux–Allard model and Maa’s theory. Acoustic parameter identification of the polyurethane foam and structural parameter optimization of the composite structures were obtained by the cuckoo search algorithm. The identified porosity and static flow resistivity were 0.958 and 13078 Pa·s/m2 respectively, and their accuracies were proved by the experimental validation. Sound absorption characteristics of the composite structures were verified by finite element simulation in virtual acoustic laboratory and validated through standing wave tube measurement in AWA6128A detector. Consistencies among the theoretical data, simulation data, and experimental data of sound absorption coefficients of the composite structures proved the effectiveness of the theoretical sound absorption model, cuckoo search algorithm, and finite element simulation method. Comparisons of actual average sound absorption coefficients of the optimal composite structure with those of the original polyurethane foam proved the practicability of this identification and optimization method, which was propitious to promote its practical application in noise reduction.

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New sound absorbent composite materials based on sawdust and polyurethane foam

Cited by 87 publications

References 28 publications

Experimental Investigations on the Performances of Composite Building Materials Based on Industrial Crops and Volcanic Rocks

Experimental Investigations on the Performances of Composite Building Materials Based on Industrial Crops and Volcanic Rocks

Characterization and physicochemical properties of wood sawdust in Niger area, Nigeria

Improving and Optimizing Sound Absorption Performance of Polyurethane Foam by Prepositive Microperforated Polymethyl Methacrylate Panel

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