Sound absorption characteristics of porous asphalt concrete pavements

2010 ◽  
Vol 37 (2) ◽  
pp. 273-278 ◽  
Author(s):  
Sungho Mun
Keyword(s):  
Asphalt Concrete ◽  
Sound Absorption ◽  
Traffic Noise ◽  
Void Content ◽  
Concrete Pavements ◽  
Aggregate Gradation ◽  
Porous Asphalt ◽  
Noise Measurements ◽  
Porous Asphalt Concrete ◽  
Absorption Characteristics

This study investigates the sound absorption characteristics of porous asphalt concrete (PAC) pavements using an impedance tube to assess noise reduction performance. It is clearly shown that an improved attenuation of sound wave energy is achieved by adjusting the air void content, aggregate gradation, and PAC pavement thickness, based on measurements of sound absorption coefficients. In addition, traffic noise measurements taken from PAC pavements in the field are compared to those taken from dense-graded asphalt concrete (DGAC), which is widely used in pavement materials.

Research on Effect of Equivalent Diameter of Voids on Sound Absorption Performance of Porous Asphalt Concrete Based on Grey Entropy Method

2020 ◽  
Vol 861 ◽  
pp. 414-420
Author(s):  
Ming Xi Liu ◽  
Jian Guang Xie ◽  
Zhan Qi Wang ◽  
Yan Ping Liu
Keyword(s):  
Asphalt Concrete ◽  
Sound Absorption ◽  
Traffic Noise ◽  
Entropy Method ◽  
Equivalent Diameter ◽  
Air Voids ◽  
Porous Asphalt ◽  
Absorption Performance ◽  
The Relationship ◽  
Porous Asphalt Concrete

The sound absorption performance of porous asphalt concrete (PAC) is inseparable from the sizes of voids, as different sizes of voids have different absorption effects on noise in different frequency bands. However, the relationship between the two is not clear. In this study, the equivalent diameter of voids was obtained by the proposed image segmentation algorithm based on the square area, then grey entropy method was used to analyze the effect of different equivalent diameter of voids on the sound absorption performance of PAC in the frequency range of traffic noise. The results show that with the increase of air voids, the peak and average sound absorption coefficient of PAC increase, the sound absorption performance of PAC is improved; and the sound absorption performance of PAC is mainly affected by the equivalent diameter of voids of 3-4mm.

scholarly journals Influence of Nominal Maximum Aggregate Size and Aggregate Gradation on Pore Characteristics of Porous Asphalt Concrete

Materials ◽  
2020 ◽  
Vol 13 (6) ◽  
pp. 1355 ◽  
Author(s):  
Wenke Huang ◽  
Xu Cai ◽  
Xiang Li ◽  
Wentian Cui ◽  
Kuanghuai Wu
Keyword(s):  
Asphalt Concrete ◽  
Aggregate Size ◽  
Image Processing Technique ◽  
Maximum Aggregate Size ◽  
Void Content ◽  
High Porosity ◽  
Porous Asphalt ◽  
Air Void ◽  
Porous Asphalt Concrete ◽  
Air Void Content

Porous asphalt concrete (PAC) has been used to improve the traffic conditions in rainy weather due to its high porosity. Aggregate size and gradation have great impact on the connected pore structure, which ultimately affects the permeability of porous asphalt concrete. In this paper, the topological properties of connective pores including pore area, pore circularity, equivalent pore diameter, and void network of porous asphalt concrete with different nominal maximum aggregate sizes and gradations were analyzed using x-ray computer tomography scans and the image processing technique. It was observed that the maximum aggregate sizes will not have significant effect on the percentage of connected pores to total pores for porous asphalt concrete. Furthermore, the percentage of connected pores to total pores is related to the air void content, but for PAC-13 with 20% target air void content or above, the connectivity does not seem to have a sharp increase. Additionally, porous asphalt concrete with a smaller nominal particle size or lower target air void content seems to generate a more concentrated distribution of Eqdiameter. Moreover, pore circularities for porous asphalt concrete with a maximum aggregate size of 10 mm or above are independent of maximum aggregate sizes. Air void contents ranging from 16% to 21% do not have a significant effect on the voids’ circularity. Furthermore, the branching nodes in porous asphalt concrete with a smaller nominal maximum aggregate size or lower target air void content have a more uniform spatial distribution. However, the percentage of cross-linked number to total node raises as the nominal maximum aggregate size or target air void content increases.

scholarly journals Research on Drain and Counter-Clogging Ability of Porous Asphalt Mixture

2015 ◽  
Vol 9 (1) ◽  
pp. 962-967
Author(s):  
Hongchang Wang ◽  
Minggang Zhou ◽  
Ming Li ◽  
Kunitomo Sugiura
Keyword(s):  
Design Parameter ◽  
Traffic Noise ◽  
Asphalt Mixture ◽  
Mixture Design ◽  
Driving Safety ◽  
Aggregate Gradation ◽  
Porous Asphalt ◽  
Pavement Surface ◽  
The World

Porous asphalts pavement arouses the attentions of the world by its good performance such as reduce the potential for hydroplaning, reduce splash and spray, improve visibility, decline traffic noise, and improve driving safety. But the void clogging lessens its durable function. So in this paper appropriate clogging agent was choose, and seepage coefficients were tested by using asphalt mixture pavement surface permeameter to simulation multi-cycle drainage clogging test. The influence of asphalt mixture design parameter such as the porosity, the maximum sizes of the aggregate, gradation and asphalt on the drainage and counter-clogging ability of porous asphalts was researched. The tests indicated that the porosity has an obvious influence on both porous asphalts’ permeable ability and counter-clogging ability. Comparing the specimen of 21% void to the ones of 16% void, the drain ability is improved 49.8%, the counter-clogging ability is improved 55.0%. The maximum sizes of the aggregate has an obvious influence on porous asphalts’ counter-clogging ability, but no an obvious influence on the drain ability. Comparing the specimen of 16mm to the 13mm, the counterclogging ability is proved 48%. PAC with the coarser graduation has a better performance on drain and counter-clogging ability. TPS modifier changes PAC little on drain and counter-clogging ability.

A STUDY ONTHEWEARINGCHARACTERISTICS OF POROUS ASPHALT CONCRETE

2000 ◽  
Vol 5 ◽  
pp. 96-102
Author(s):  
Satoshi KURODA ◽  
Yoshiteru KATO ◽  
Yasuo GUNJI
Keyword(s):  
Asphalt Concrete ◽  
Porous Asphalt ◽  
Porous Asphalt Concrete

Induction heating of electrically conductive porous asphalt concrete

2010 ◽  
Vol 24 (7) ◽  
pp. 1207-1213 ◽  
Author(s):  
Quantao Liu ◽  
Erik Schlangen ◽  
Álvaro García ◽  
Martin van de Ven
Keyword(s):  
Induction Heating ◽  
Asphalt Concrete ◽  
Electrically Conductive ◽  
Porous Asphalt ◽  
Porous Asphalt Concrete

scholarly journals Porous asphalt concrete: A review of design, construction, performance and maintenance

2020 ◽  
Vol 13 (6) ◽  
pp. 601-612 ◽  
Author(s):  
Jian-Shiuh Chen ◽  
Chin Hung Yang
Keyword(s):  
Asphalt Concrete ◽  
Material Selection ◽  
Winter Maintenance ◽  
Porous Asphalt ◽  
Pavement Surface ◽  
Long Run ◽  
The World ◽  
And Performance ◽  
Porous Asphalt Concrete ◽  
Design Construction

AbstractPorous asphalt concrete (PAC) is an open-graded friction course that is specifically designed to have high air void contents for removing water from the pavement surface. PAC surfaces, which include open-graded friction courses, permeable friction courses, and drainage asphalt pavements, have increasingly gained acceptance among agencies and industry in the world. PAC might be susceptible to freeze-thaw damage in cold climates and require winter maintenance practices. The life span of PAC pavements shows a large variation depending on climates, traffic volumes and loadings, design and construction practices. The objective of this paper was to review design, construction, and performance that could maximize the advantages and minimize the disadvantages associated with the use of PAC mixtures. A consolidated review of the worldwide literature on PAC applications was conducted, with attention to the use of PAC in agency practices, and specifications for PAC from the world were evaluated. Based on an analysis of the results of this review, two key features were emphasized: (1) a recommended practice for material selection and design of PAC, and (2) a recommended practice for PAC construction and maintenance. Key points include a careful assessment of the PAC drainage and an adequate asphalt content to improve the performance of the pavement surface. A proper binder content stabilized by additives such as fibers and polymers is essential to ensure sufficient film thickness that is critical to the durability of the PAC mix in the long run.

scholarly journals Investigation of Water Uptake in Porous Asphalt Concrete Using Neutron Radiography

2014 ◽  
Vol 105 (2) ◽  
pp. 431-450 ◽  
Author(s):  
Sreeyuth Lal ◽  
Lily D. Poulikakos ◽  
Marjan Sedighi Gilani ◽  
Iwan Jerjen ◽  
Peter Vontobel ◽  
...  
Keyword(s):  
Water Uptake ◽  
Asphalt Concrete ◽  
Neutron Radiography ◽  
Porous Asphalt ◽  
Porous Asphalt Concrete
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