NUMERICAL MODELLING OF MEDIAN ROAD TRAFFIC NOISE BARRIERS

2002 ◽  
Vol 251 (4) ◽  
pp. 671-681 ◽  
Author(s):  
S.J. MARTIN ◽  
D.C. HOTHERSALL
Keyword(s):  
Numerical Modelling ◽  
Road Traffic ◽  
Traffic Noise ◽  
Road Traffic Noise ◽  
Noise Barriers

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 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).

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.

scholarly journals 3D noise mapping for preselected locations of urban area with and without noise barriers: A case study of Delhi, India

Noise Mapping ◽  
2020 ◽  
Vol 7 (1) ◽  
pp. 74-83
Author(s):  
Pervez Alam ◽  
Kafeel Ahmad ◽  
S. S. Afsar ◽  
Nasim Akhtar
Keyword(s):  
Noise Level ◽  
Urban Areas ◽  
Road Traffic ◽  
Traffic Noise ◽  
Residential Building ◽  
Noise Pollution ◽  
Critical Issue ◽  
Road Traffic Noise ◽  
Noise Barriers ◽  
Noise Mapping

AbstractNoise pollution has been rising as a critical issue in recent days particularly for the people living in urban areas. This study has been conducted to find out the effects of traffic induced noise on nearby residential building through 3D noise mapping with and without noise Barriers. Monitoring has been carried out at various densely populated preselected locations of Delhi, India. Thereafter, 3D noise mapping has been done using hourly average noise levels for the locations exposed with maximum noise. The developed 3D noise map shows the variation of noise level along X, Y and Z direction for all selected locations before and after installation of noise barriers. Moreover, the result also shows that exact assessment of noise impact is possible through 3D noise mapping, when a multistory building close to the source of noise is taken into consideration. This paper also elaborates the adequate height, distance and NRC value of noise barrier to reduce the effect of road traffic noise on nearby high rise building. Reduction pattern of noise level can easily be visualized and evaluated by using these maps. This type of study could support decision makers during adaptation of suitable remedial measures.

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