Evaluation on the effectiveness of noise barriers for road traffic noise mitigation

1998 ◽  
Author(s):  
Pak-lam Chau
Keyword(s):  
Road Traffic ◽  
Traffic Noise ◽  
Road Traffic Noise ◽  
Noise Mitigation ◽  
Noise Barriers

scholarly journals Recent Developments in Sonic Crystals as Barriers for Road Traffic Noise Mitigation

Environments ◽  
2019 ◽  
Vol 6 (2) ◽  
pp. 14 ◽  
Author(s):  
Luca Fredianelli ◽  
Alessandro Del Pizzo ◽  
Gaetano Licitra
Keyword(s):  
Insertion Loss ◽  
Road Traffic ◽  
Traffic Noise ◽  
Porous Coating ◽  
Road Traffic Noise ◽  
Noise Mitigation ◽  
Noise Barriers ◽  
Continuous Growth ◽  
Sonic Crystal ◽  
Sonic Crystals

Noise barriers are the most widespread solution to mitigate noise produced by the continuous growth of vehicular traffic, thus reducing the large number of people exposed to it and avoiding unpleasant effects on health. However, conventional noise barriers present the well-known issues related to the diffraction at the edges which reduces the net insertion loss, to the reflection of sound energy in the opposite direction, and to the complaints of citizens due to the reduction of field of view, natural light, and air flow. In order to avoid these shortcomings and maximize noise abatement, recent research has moved toward the development of sonic crystals as noise barriers. A previous review found in the literature was focused on the theoretical aspects of the propagation of sound through crystals. The present work on the other hand reviews the latest studies concerning the practical application of sonic crystal as noise barriers, especially for road traffic noise mitigation. The paper explores and compares the latest developments reported in the scientific literature, focused on integrating Bragg’s law properties with other mitigation effects such as hollow scatterers, wooden or recycled materials, or porous coating. These solutions could increase the insertion loss and frequency band gap, while inserting the noise mitigation action in a green and circular economy. The pros and cons of sonic crystal barriers will also be discussed, with the aim of finding the best solution that is actually viable, as well as stimulating future research on the aspects requiring improvement.

Road traffic noise barriers based on recycled materials.

2010 ◽  
Vol 128 (4) ◽  
pp. 2366-2366
Author(s):  
Jesus Alba ◽  
Romina del Rey ◽  
Jaime Ramis
Keyword(s):  
Road Traffic ◽  
Traffic Noise ◽  
Road Traffic Noise ◽  
Noise Barriers ◽  
Recycled Materials

scholarly journals Croatian Experience in Road Traffic Noise Management - Concrete Noise Barriers

2014 ◽  
Vol 3 (1) ◽  
pp. 1-11
Author(s):  
Saša Ahac ◽  
Ivo Haladin ◽  
Stjepan Lakušić ◽  
Vesna Dragčević
Keyword(s):  
Building Materials ◽  
Road Traffic ◽  
Traffic Noise ◽  
Road Traffic Noise ◽  
Innovative Product ◽  
Noise Barriers ◽  
Waste Tyres ◽  
Noise Barrier ◽  
Recycled Waste ◽  
Absorptive Layer

Abstract The paper gives an overview of concrete noise barrier application in several EU countries and in Croatia. It describes a process of introducing different noise protection solutions on Croatian market in the phase of intensive motorway construction in recent years. Namely, an extensive motorway network has been constructed in Croatia in the last 10 years. Following the process of motorway construction, noise protection walls have also been erected. Usage of different building materials and installation processes as well as variations in building expenditures has led to a comparative analysis of several types of noise protection solutions (expanded clay, wood fibre) including a new eco-innovative product RUCONBAR, which incorporates rubber granules from recycled waste tyres to form a porous noise absorptive layer.

scholarly journals Traffic Noise Mitigation Using Single and Double Barrier Caps of Different Shapes for an Extended Frequency Range

2020 ◽  
Vol 10 (17) ◽  
pp. 5746 ◽  
Author(s):  
Domingo Pardo-Quiles ◽  
José-Víctor Rodríguez ◽  
Jose-Maria Molina-García-Pardo ◽  
Leandro Juan-Llácer
Keyword(s):  
Road Traffic ◽  
Traffic Noise ◽  
Noise Mitigation ◽  
Noise Barriers ◽  
Double Barrier ◽  
Noise Abatement ◽  
Extended Frequency ◽  
Different Shapes ◽  
The Aesthetic ◽  
Insertion Losses

The primary function of noise barriers is to shield inhabitants of affected areas from excessive noise generated by road traffic. To enhance the performance of noise barriers while simultaneously adhering to height restrictions, the attachment of structures (caps) of different shapes to the tops of conventional screens can be considered. These caps can significantly impact the diffracted sound energy, thereby increasing the desired global acoustic losses. This work presents a comprehensive study of the acoustic performance of noise barriers with single and double attached caps of different shapes through a calculation of their insertion losses (IL). This study comprehensively addresses and compares different types, sizes, combinations, and numbers of noise barrier caps for different scenarios (including sloping and absorbent grounds) and sources (“car” and “ambulance”) for an extended frequency band up to 10 kHz. To the best of the authors’ knowledge, this is a range that has not previously been analyzed. A variety of different cap shapes were considered including cylinders, rectangles, trapezoids, and Y/T-shaped forms. To calculate the IL, an innovative and fast uniform theory of diffraction (UTD)-based method developed by the authors was applied in all simulations. The results showed that the Y-shaped single and double barrier caps were, in general, the most effective at increasing IL without raising the height of the barrier, thereby successfully managing the aesthetic impact. The results also showed how the consideration of sloping and absorbent floors could also contribute to improved noise abatement.

scholarly journals Recycling ceramic industry wastes in sound absorbing materials

2016 ◽  
Vol 66 (324) ◽  
pp. 106 ◽  
Author(s):  
C. Arenas ◽  
L. F. Vilches ◽  
C. Leiva ◽  
B. Alonso-Fariñas ◽  
M. Rodríguez-Galán
Keyword(s):  
Sound Absorption ◽  
Road Traffic ◽  
Traffic Noise ◽  
Physical And Mechanical Properties ◽  
Normal Incidence ◽  
Road Traffic Noise ◽  
Noise Barriers ◽  
Porous Concrete ◽  
Ceramic Waste ◽  
Crushed Granite

The scope of this investigation is to develop a material mainly composed (80% w/w) of ceramic wastes that can be applied in the manufacture of road traffic noise reducing devices. The characterization of the product has been carried out attending to its acoustic, physical and mechanical properties, by measuring the sound absorption coefficient at normal incidence, the open void ratio, density and compressive strength. Since the sound absorbing behavior of a porous material is related to the size of the pores and the thickness of the specimen tested, the influence of the particle grain size of the ceramic waste and the thickness of the samples tested on the properties of the final product has been analyzed. The results obtained have been compared to a porous concrete made of crushed granite aggregate as a reference commercial material traditionally used in similar applications. Compositions with coarse particles showed greater sound absorption properties than compositions made with finer particles, besides presenting better sound absorption behavior than the reference porous concrete. Therefore, a ceramic waste-based porous concrete can be potentially recycled in the highway noise barriers field.

Road Traffic Noise Attenuation by Vegetation Belts at Some Sites in the Tarai Region of India

2013 ◽  
Vol 38 (3) ◽  
pp. 389-395 ◽  
Author(s):  
Vikrant Tyagi ◽  
Krishan Kumar ◽  
V.K. Jain
Keyword(s):  
Road Traffic ◽  
Traffic Noise ◽  
Road Traffic Noise ◽  
Noise Attenuation ◽  
Noise Barriers ◽  
Low Frequencies ◽  
High Frequencies ◽  
Noise Measurements ◽  
Significant Attenuation ◽  
Excess Attenuation

Abstract Noise measurements have been carried out at eleven different sites located in three prominent cities of the Tarai region of India to evaluate the effectiveness of vegetation belts in reducing traffic noise along the roadsides. Attenuation per doubling of distance has been computed for each site and excess attenuation at different 1/3 octave frequencies has been estimated. The average excess attenuation is found to be approximately 15 dB over the low frequencies (200 Hz to 500 Hz) and between 15 dB to 20 dB over the high frequencies (8 kHz to 12.5 kHz). Over the critical middle frequencies (1-4 kHz), the average excess attenuation (between 10-15 dB) though not as high, is still significant, with a number of sites showing an excess attenuation of 15 dB or more at 1 kHz. The results indicate that sufficiently dense vegetation belts along the roadsides may prove as effective noise barriers and significant attenuation may be achieved over the critical middle frequencies (1-4 kHz).

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