scholarly journals Study of Sound Absorption Characteristics of Pavement Materials

2019 ◽  
Author(s):  
Lu Chu ◽  
Tien Fwa
Keyword(s):  
Sound Absorption ◽  
Pavement Materials ◽  
Absorption Characteristics

Laboratory Evaluation of Sound Absorption Characteristics of Pervious Concrete Pavement Materials

2017 ◽  
Vol 2629 (1) ◽  
pp. 91-103 ◽  
Author(s):  
Longjia Chu ◽  
Tien F. Fwa ◽  
Kiang H. Tan
Keyword(s):  
Sound Absorption ◽  
Field Testing ◽  
Concrete Pavement ◽  
Pervious Concrete ◽  
Practical Significance ◽  
Laboratory Evaluation ◽  
Portland Cement Concrete ◽  
Frequency Range ◽  
Pavement Materials ◽  
Absorption Characteristics

This paper describes a laboratory study on the sound absorption characteristics of clogged and unclogged pervious concrete (PC) pavement materials compared with those of porous asphalt (PA) mixtures and those of conventional dense-graded asphalt and portland cement concrete pavement materials. Examined in this study were the effects of the mixtures’ initial porosity on their sound absorption characteristics and how these characteristics were affected by subsequent clogging of the mixtures. Four porosity levels of PC and PA were studied: 10%, 15%, 20%, and 25%. The mixtures with 20% porosity were tested for the effects of clogging. The test results showed that the shapes of sound absorption spectra of PC and PA materials were similar displayed high sound absorption values within the frequency range of 250 to 1,000 Hz. However, for all four porosity levels studied, the PC materials produced about 0.1 or 20% higher sound absorption coefficient values throughout the entire measured frequency range from 100 to 2,500 Hz. The same order of magnitude of differences in the sound absorption values between PC and PA was also observed in their clogged states. The finding that PC exhibits a better sound absorption capability than PA is of practical significance. The results of this study also demonstrate that laboratory testing of sound absorption can be employed to provide a useful indicative assessment of the noise reduction properties of porous pavement materials without the need for full-scale field testing.

scholarly journals Sound absorption characteristics of a double-leaf structure with an MPP and a permeable membrane

2014 ◽  
Vol 76 ◽  
pp. 28-34 ◽  
Author(s):  
Kimihiro Sakagami ◽  
Yusaku Fukutani ◽  
Motoki Yairi ◽  
Masayuki Morimoto
Keyword(s):  
Sound Absorption ◽  
Leaf Structure ◽  
Permeable Membrane ◽  
Absorption Characteristics

Trial applications at gymnasiums of in-situ sound absorption measurement method by ensemble averaging technique

2021 ◽  
Vol 263 (2) ◽  
pp. 4532-4537
Author(s):  
Toru Otsuru ◽  
Reiji Tomiku ◽  
Noriko Okamoto ◽  
Siwat Lawanwadeekul
Keyword(s):  
Measurement Method ◽  
Sound Absorption ◽  
Glass Wool ◽  
Absorption Measurement ◽  
Ensemble Averaging ◽  
Averaging Technique ◽  
In Situ Conditions ◽  
Measurement Consistency ◽  
Absorption Characteristics

The authors have been published a series of papers on a measurement method for sound absorption characteristics of materials using ensemble averaging technique, i.e., EA method. The papers' results included measurement mechanisms, measurement uncertainty, and so on. Herein, to examine adaptability, especially in in-situ conditions, the EA method is applied to measure absorption characteristics of materials installed in two gymnasiums. A glass-wool panel with the dimension of 0.5 m by 0.5 m by 0.05 m and with the density of 32 kg m^-3 was brought around and measured to check the measurement consistency. Several measurements were conducted during badminton plays were undergoing. Measured sound absorption coefficients revealed that most results agree well with those measured in reverberation rooms. Certain improvement is necessary for the specimen brought to the in-situ measurement to keep the consistency. The inconsistency is considered to originate from unstable conditions between the specimen and floor.

scholarly journals Application of transparent microperforated panel to acrylic partitions for desktop use: A case study by prototyping

2021 ◽  
Author(s):  
Kimihiro Sakagami ◽  
Midori Kusaka ◽  
Takeshi Okuzono ◽  
Shigeyuki Kido ◽  
Daichi Yamaguchi
Keyword(s):  
Adverse Effect ◽  
Sound Absorption ◽  
Acoustic Environment ◽  
Actual Use ◽  
Acrylic Sheet ◽  
Absorption Performance ◽  
The Subject ◽  
Droplet Penetration ◽  
Absorption Characteristics

There are various measures currently in place to prevent the spread of COVID-19; however, in some cases, these can have an adverse effect on the acoustic environment in buildings. For example, transparent acrylic partitions are often used in eating establishments, meeting rooms, offices, etc., to prevent droplet infection. However, acrylic partitions are acoustically reflective; therefore, reflected sounds may cause acoustic problems such as difficulties in conversation or the leakage of conversation. In this study, we performed a prototyping of transparent acrylic partitions to which a microperforated panel (MPP) was applied for sound absorption while maintaining transparency. The proposed partition is a triple-leaf acrylic partition with a single acrylic sheet without holes between two MPP sheets, as including a hole-free panel is important to a possible droplet penetration. The sound absorption characteristics were investigated by measuring the sound absorption in a reverberation room. As the original prototype showed sound absorption characteristics with a gentle peak and low values due to the openings on the periphery, it was modified by closing the openings of the top and sides. The sound absorption performance was improved to some extent when the top and sides were closed, although there remains the possibility of further improvement. This time, only the sound absorption characteristics were examined in the prototype experiments. The effects during actual use will be the subject of future study.

Fabrication of castor oil-derived polyurethane mortar composites with energy saving and sound absorption characteristics

2021 ◽  
Vol 28 (12) ◽  
Author(s):  
A. A. Mahmoud ◽  
E. A. Nasr ◽  
Sonia Zulfiqar ◽  
Muhammad Ilyas Sarwar ◽  
A. A. Maamoun
Keyword(s):  
Energy Saving ◽  
Castor Oil ◽  
Sound Absorption ◽  
Absorption Characteristics
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