Optimized Asphalt Mixtures for Noise Reduction in Lithuanian Roads

2014 ◽  
Vol 614 ◽  
pp. 618-621
Author(s):  
Audrius Vaitkus ◽  
Tadas Andriejauskas ◽  
Laura Čygaitė ◽  
Jurgita Židanavičiūtė
Keyword(s):  
Noise Reduction ◽  
Noise Pollution ◽  
Low Noise ◽  
Asphalt Pavements ◽  
Noise Levels ◽  
Road Noise ◽  
Negative Effects ◽  
Development Experience ◽  
Growing Economy ◽  
Generation Mechanisms

In the world of growing economy and population, the need of transportation is rapidly increasing also raising problems of noise pollution. Environmental noise levels are increasing in parallel with increasing traffic flows resulting negative effects for society, wildlife and economy. The article gives an overview about the main transport noise source tyre/road noise, its generation mechanisms and influencing factors. One of the most effective and promising tyre/road noise solutions is low noise pavements, which has different noise reduction approaches. Low noise asphalt pavements and theoretical noise reduction principles are analysed in the paper as well as the development experience of particular low noise asphalt pavements for Lithuanian conditions.

Surface Type and Age Effects on Tyre/Road Noise Levels

2017 ◽  
Author(s):  
Audrius Vaitkus ◽  
Viktoras Vorobjovas ◽  
Donatas Čygas ◽  
Tadas Andriejauskas ◽  
Faustina Tuminienė
Keyword(s):  
Surface Characteristics ◽  
Low Noise ◽  
Age Effects ◽  
Noise Levels ◽  
Road Noise ◽  
Acoustical Parameters ◽  
Surface Type ◽  
Acoustical Properties ◽  
Level Measurement ◽  
Generation Mechanisms

Road surface characteristics are the core influencing factors for tyre/road noise generation mechanisms. Depending on the pavement wearing layer mixture composition, type surfaces have different acoustical properties. Acoustical parameters and acoustical behavior change over the time because of the effects of traffic and environmental conditions. Usually low noise pavements can be characterized with very good acoustical parameters but at the same time good acoustical properties deteriorates over the time. Paper presents the research study of surface type and age effects on tyre/road noise levels. Number of different age and different surface type pavements (conventional AC and SMA pavements, low noise SMA TM, TMOA and PA) were evaluated and compared in terms of acoustical performance. Analysis of CPX noise level measurement results are presented in the paper followed with the conclusions and recommendations of low noise pavement application for severe climate regions.

Paper 16: A Study of Tractor Noise Control

1969 ◽  
Vol 184 (17) ◽  
pp. 149-169
Author(s):  
J. Matthews ◽  
J. D. C. Talamo
Keyword(s):  
Hearing Loss ◽  
Diesel Engine ◽  
Noise Reduction ◽  
Noise Level ◽  
Exhaust System ◽  
Low Noise ◽  
Acoustic Features ◽  
Noise Levels ◽  
Engine Design ◽  
High Incidence

A high incidence of hearing loss has been encountered among tractor drivers, and noise levels are shown to be further increased by the addition of cabs, particularly those which are structurally strong to resist crushing if the vehicle overturns. Some reductions in the noise level of the operator's environment can be obtained by covering the engine or by exhaust system modifications, while possible future improvements to diesel engine design may effect a significant improvement. However, it is proposed that noise reduction is likely to be achieved by attention to acoustic features of the operator's cab. The inclusion of resilient mounts, substantial floors and bulkheads, and acoustically absorbent linings are all shown to provide worthwhile improvements and, in combination, these measures can reduce noise levels from more than 100 dBA to 90 dBA or less. Where the tractor is fitted with a safety frame only, a low noise fabric cladding is shown to be feasible.

scholarly journals Evaluating the Tire/Pavement Noise and Surface Texture of Low-Noise Micro-Surface Using 3D Digital Image Technology

2021 ◽  
Vol 8 ◽  
Author(s):  
Wang Chen ◽  
Mulian Zheng ◽  
Haiyang Wang
Keyword(s):  
Noise Reduction ◽  
Digital Image ◽  
Surface Texture ◽  
Three Dimensional ◽  
Low Noise ◽  
Road Noise ◽  
Texture Model ◽  
Promising Tool ◽  
Absorbing Materials ◽  
Reduction Effect

As a common preventive maintenance technique for asphalt pavement, micro-surface (MS) has the advantages of waterproofing and crack sealing. However, issues such as the fact that the conventional MS generates large noise and the evaluation of the indexes of tire-road noise are relatively less studied. The traditional surface texture index cannot reveal the range and distribution of pavement surface texture, thus hindering research of low-noise MS. To study the mechanism of tire-road noise generated by MS, and propose the tire-road noise and surface texture indicators for MS. In this study, the mechanism of five low-noise MS was systematically analyzed and compared through surface texture and noise tests. Then, a three-dimensional digital texture model (3D-DTM) of MS surface texture was constructed using a series of digital image processing techniques, including grayscale identification, binary conversion, and noise reduction. The results show that optimizing the gradation, adding sound-absorbing materials, and improving the workability of construction can improve the noise reduction performance of MS, it is worth mentioning that the MS prepared with sound-absorbing materials and low-noise gradation has the greatest noise reduction effect, with a maximum reduction of 6.3 dB(A). In addition, it was also found that the 3D-DTM can well reflect the surface texture characteristics of MS. The probability of convex peak distribution (PCD) and the proportion of convex peak area (PCA) with peak heights greater than 0.25 mm (Kh ≥ 0.25), which are extracted from the 3D-DTM, can well reflect the surface texture, tire-road noise, respectively. The results show that the 3D-DTM is a promising tool to optimize the design of low-noise MS.

scholarly journals Low noise levels of BEV electric cars - an advantage or disadvantage?

2018 ◽  
Vol 19 (12) ◽  
pp. 221-224
Author(s):  
Ewelina Sendek-Matysiak
Keyword(s):  
Co2 Emissions ◽  
Road Traffic ◽  
Development Trend ◽  
Low Noise ◽  
Electric Motors ◽  
Noise Levels ◽  
Noise Emission ◽  
Negative Effects ◽  
Electric Cars ◽  
Automotive Market

Everything indicates that the future of the automotive market is related to the use of electric motors. It is related to, among others with the introduction of increasing restrictions on CO2 emissions and noise. In addition, the fuel market itself (mining and processing) has major limitations not only ecological, but above all economical and political. Supplying cars exclusively from batteries is currently a strong development trend propagated almost by all major manufacturers. One of the researched aspects of vehicles introduced to the market is the issue of noise emission, whose emission has both positive and negative effects on road traffic.

scholarly journals Evaluation of Siltation Degree of Permeable Asphalt Pavement and Detection of Noise Reduction Degree

2020 ◽  
Vol 11 (1) ◽  
pp. 349
Author(s):  
Shuang Chen ◽  
Xuechun Lin ◽  
Chuanfeng Zheng ◽  
Xuedong Guo ◽  
Wuxing Chen
Keyword(s):  
Particle Size ◽  
Noise Reduction ◽  
Asphalt Concrete ◽  
Asphalt Mixture ◽  
Asphalt Pavements ◽  
Test Machine ◽  
Road Noise ◽  
The Road ◽  
Before And After ◽  
Sludge Particle

This study mainly uses PFC (particle follow code) to simulate the void characteristics of permeable asphalt mixture, and uses these to simulate the silting process. Then, a tire drop test was used to evaluate the noise reduction performance of permeable asphalt concrete. Finally, a self-made ring rutting test machine was used to simulate the silting process. Through experiments, the following conclusions were obtained: 1. The critical size of the sludge particle size is 0.3 mm–0.6 mm. 2. The quality of the water-permeable asphalt concrete specimens increased by 13% before and after silting, and the porosity of the specimens finally decreased from about 20% to about 8%. The water-permeable function only retained less than 20% of the original, and the water-permeable function was basically lost. 3. By measuring the road noise detection, it was found that the road noise is directly proportional to the degree of blockage of the permeable road. Compared with the original road with a perfect permeable function, the road noise of the completely blocked road increased by about 4 decibels. This study reveals the silting process of permeable asphalt mixture and the key particle size of the silt, which is of great significance for the detection, cleaning and maintenance of permeable asphalt pavements.

scholarly journals Initial Field Validation of Poroelastic Pavement Made with Crumb Rubber, Mineral Aggregate and Highly Polymer-Modified Bitumen

Materials ◽  
2020 ◽  
Vol 13 (6) ◽  
pp. 1339
Author(s):  
Piotr Jaskula ◽  
Jerzy Ejsmont ◽  
Marcin Stienss ◽  
Grzegorz Ronowski ◽  
Cezary Szydlowski ◽  
...  
Keyword(s):  
Noise Reduction ◽  
Traffic Noise ◽  
Asphalt Binder ◽  
Crumb Rubber ◽  
Low Noise ◽  
Base Layer ◽  
Road Noise ◽  
Modified Bitumen ◽  
Initial Field ◽  
Mineral Aggregate

Tire/road noise in most driving conditions dominates other sources of traffic noise. One of the most efficient ways of reducing tire/road noise is to use the so-called “low noise pavement”. According to numerous studies, at present, poroelastic road pavement that is composed of rubber and mineral aggregate and polyurethane or bituminous binder gives the best noise reduction up to 12 dB. Unfortunately, there are many problems with making durable poroelastic pavements. This article presents the first results of a project that is executed in Poland and aims at the development of a durable, low noise poroelastic pavement based on polymer-modified asphalt binder called Safe, Eco-friendly POroelastic Road Surface (SEPOR). Two test sections were built in 2019 to test the production technology and performance of the SEPOR pavement. It is observed that some of the problems with previous poroelastic materials were mainly eliminated (especially delamination from the base layer and raveling) but noise reduction is a little less than expected (up to 9 dB). Rolling resistance for car tires is acceptable and fire properties (damping of spill fuel fires, toxic gas emission) are very good.

Low-Noise Asphalt Pavements in Urban Areas

2016 ◽  
Vol 858 ◽  
pp. 282-286
Author(s):  
Petr Kozak ◽  
Ondrej Dasek ◽  
Radka Matuszkova ◽  
Michal Radimsky
Keyword(s):  
Asphalt Concrete ◽  
Urban Areas ◽  
Road Traffic ◽  
Traffic Noise ◽  
Noise Pollution ◽  
Low Noise ◽  
Thin Layers ◽  
Asphalt Pavements ◽  
Road Traffic Noise ◽  
Vehicle Speed

Current requirements for the reduction of the noise pollution in inhabited areas are constantly increasing. Acoustic wearing courses represent the real measures how to directly mitigate sources of road traffic noise created by a tire/road contact. Directly reduced noise emissions created by a tire/road contact don't need further mitigation by expensive noise barriers. Noise emissions on two different types of wearing courses of asphalt mixtures (Asphalt concrete for very thin layers and Low-noise stone mastic asphalt) were measured using the specialized device operating on the basis of CPX (Close Proximity method) and compared with the standard mixture of Asphalt concrete. Differences were between 1 dB and 5 dB depending on the wearing course and the vehicle speed. The efficiency of the low-noise asphalt pavements was also compared with the initial costs of the pavements. The economical evaluation confirmed that the initial costs of the acoustic wearing courses are higher than the costs of the standard asphalt concrete mixture. However the noise reduction by 1 dB using the asphalt concrete for very thin layers increases the costs just by 350 USD (considering the same length and width of the road segment), which makes acoustic wearing courses the economically efficient noise reducing measure.

scholarly journals Assessment of noise pollution at various locations of Gorakhpur

2021 ◽  
Vol 13 (1) ◽  
pp. 131-137
Author(s):  
Maharshi Yadav ◽  
Ratnesh Kumar Patel ◽  
Abhishek Yadav ◽  
Gaurav Sharma ◽  
Govind Pandey
Keyword(s):  
Human Activities ◽  
Noise Level ◽  
Traffic Noise ◽  
Noise Pollution ◽  
Low Noise ◽  
Educational Institutions ◽  
Noise Levels ◽  
High Noise ◽  
High Noise Level ◽  
Medical College

Noise pollution is one of the major concerns in big cities as well as in the crowded area of small cites, Gorakhpur is fastgrowing city and has many locations with high noise levels. Various crossroads and intersections have traffic issues this causes high noise level. In this study, three locations were selected for noise level assessment, nearby areas of Gorakhnath Temple, BRD medical college and MMMUT. These locations are educational (silent) and low noise level zone but because they situated near traffic roads, which cause high noise levels around them. In this study outside periphery of educational institutions noise level increases due to traffic. Noise level is found to be high due to large number of human activities.  

scholarly journals Asphalt Pavement Acoustic Performance Model

2019 ◽  
Vol 11 (10) ◽  
pp. 2938 ◽  
Author(s):  
Rita Kleizienė ◽  
Ovidijus Šernas ◽  
Audrius Vaitkus ◽  
Rūta Simanavičienė
Keyword(s):  
Noise Reduction ◽  
Noise Level ◽  
Asphalt Mixture ◽  
Low Noise ◽  
Asphalt Mixtures ◽  
Mixture Composition ◽  
Void Content ◽  
Road Noise ◽  
Air Void ◽  
Air Void Content

Low-noise pavements are used as an effective method of traffic noise mitigation. Low-noise pavements reduce the noise that arises due to interactions between tires and road surfaces (tire/road) via the implementation of three main components: low pavement roughness, negative pavement texture, and a high pavement air-void content. The tire/road noise reduction capabilities of the wearing layer vary depending on the aggregate type, gradation, bitumen and air-void content, and density. Consequently, the demand for an accurate tire/road noise prediction model has arisen from the design of asphalt mixtures. This paper deals with how asphalt mixture components of the wearing layer influence tire/pavement noise reduction and presents a model for tire/road noise level prediction based on the asphalt mixture composition. The paper demonstrates that the noise reduction level of low-noise asphalt pavements is dependent on the composition of the asphalt mixture. Asphalt wearing layer mixture composition parameters were tested in the laboratory from cores taken from 18 road sections, where acoustic properties were measured using a close-proximity (CPX) method. The proposed linear model is based on the bitumen amount, the air-void content of the mixture and aggregate shape and involves materials that comply with the general requirements for high-quality asphalt mixtures. The model allows for the prediction of the tire/road noise level at the asphalt mixture design stage using asphalt mixture components and volumetric properties. The proposed model is the first stage in the building of a complex model with a much wider range of low-noise asphalts components, pavement profile depth and CPX-value relationships.

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