Analysis of Tire-Pavement Noise Spectrum of Noise Reduction Dense Asphalt-rubber Pavement

The types of noise reduction asphalt pavement were summarized into the follows: single layer porous or two-layer porous asphalt pavement, elastic asphalt pavement, optimized surface texture pavement, and universally composable one based on these three types. Beijing of China was very drought and short of rainfall, there were large volume of traffic, heavy wheel load and many dirt things on the pavement surface taken by the tires too. So the dense asphalt-rubber pavement was the most common one for noise reduction, which was paved by gap-graded, macro-texture, dense asphalt concrete, belonging to the types of elastic and optimized surface texture noise reduction pavement. And it could reduce tire-pavement noise obviously and had excellent durability; all proved that it had gone through traffic and climate environment of Beijing well. It had measured tire-pavement noise of asphalt rubber pavement and stone mustic asphalt pavement in Beijing from 2009 to 2012. This measurement was according to Measurement of close-proximity method which prepared by international organization for standardization in the year 2000. And the test vehicle was a trailer for measuring tire-pavement noise which met requirements of ISO/CD 11819-2:2000. The factors affecting tire-pavement noise spectrum were analyzed, such as temperature, speed, age of pavement and so on. It reveals that the tire-pavement noise sound level could get higher especially higher during the frequency 500Hz similar to 2500Hz in the noise spectrum, while the testing speed increase, or the temperature decrease, or the age of pavement grow. While the frequency lay on the range of higher than 800 Hz, the asphalt rubber pavement's noise sound level were lower than the stone mustic asphalt pavement's one in all situations, and when the temperature decreased from 30 C to 0 C, the low limit frequency decreased from 800Hz to 63 Hz. It had tested dynamic modulus and phase angle of the two kinds of pavement materials under different temperature and load frequency with the help of Simple Performance Tester in order to show the reason, The result shows that, asphalt-rubber concrete has smaller Phase angle at wide temperature as well as frequency changes, it could be one of the main reasons to explain this phenomenon. It could provide reference for designing, constructing, maintaining and evaluating the noise reduction asphalt pavement.