|Table of Contents|

Influence of material design parameters on noise reduction performance of two-layer porous pavement(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2023年1期
Page:
10-17
Research Field:
道路工程
Publishing date:

Info

Title:
Influence of material design parameters on noise reduction performance of two-layer porous pavement
Author(s):
LI Ming-liang1; 2;  HUA Xia3;  XIAO Yue4;  LI Jun1; 2;  HAN Ding-ding1; 2;  WU Hao1; 2
(1.Research Institute of Highway Ministry of Transport, Beijing 100088, China; 2.Key Laboratory of Transport Industry of Road Structure and Material, Beijing 100088, China; 3.Jiangsu Expressway Engineering Maintenance Technology Co., Ltd, Nanjing 211106, Jiangsu, China; 4.School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, Hubei, China)
Keywords:
road engineering;  two-layer porous asphalt pavement;  composite two-layer porous pavement;  sound absorption coefficient;  polyurethane;  interlayer bonding material;  air voids content
PACS:
U414
DOI:
10.19721/j.cnki.1671-8879.2023.01.002
Abstract:
For improving the sound absorption property of the two-layer porous pavement, which will lead to an increased performance of reducing noise generated from tyre and road surface interaction, and providing support for optimizing the design of noise reduction function. Influences of material design parameters of a two-layer porous asphalt, including the amount of bonding materials between layers and the air voids content of the bottom layer, on sound absorption coefficients were studied. The sound absorption coefficient curve of the asphalt mixture was obtained by the surface acoustic impedance measurement. The effects of the amount of bonding materials, and the air voids content of the bottom layer on the peak sound absorption coefficients and peak frequency locations were compared. The bonding strengths were observed by measuring the tensile strength and shear strength of the two-layer samples. For further improving the performance of two-layer porous pavement, a composite structure was developed based on control of the amount of interlayer bonding materials and air voids contents of the bottom layer. In this structure, the surface layer was made of mixture using polyurethane as binder, and material of the bottom layer was the modified asphalt mixture. The basic mechanical performances and sound absorption properties of the composite pavement materials were observed and analyzed by laboratory tests. The results show that increasing the amount of modified emulsified asphalt between the porous asphalt layers can improve the bonding strength, but it will reduce the sound absorption performance of the two-layer sample, as well as influencing the frequency interval of sound absorption coefficient distribution. Improving the air voids content of the bottom layer can increase the sound absorption performance of the two-layer porous pavement, especially for noise absorption at high frequencies. When air voids content of the bottom layer is less than 20%, the peak value of the sound absorption coefficient will decrease obviously. Under the condition that the polyurethane provides sufficient bonding strength and mechanical performance of the top layer, the bonding material is eliminated in this structure and air voids contents of both layers are improved. A significant sound absorption effect is demonstrated at both high and low frequencies for the composite pavement structure.In order to obtain a balanced sound absorption and bonding strength of two-layer porous asphalt, the air voids content for bottom layer should be no less than 20%. On the basis of ensuring sufficient sound absorption, a larger amount of bonding material is suggested to be used. For the composite two-layer porous pavement, the air voids content for both layers can be increased to some extent, in order to improve the sound absorption performance and obtain prominent material mechanical properties.2 tabs, 8 figs, 23 refs.

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Last Update: 2023-01-30