废旧橡胶沥青SMA混合料铺设路面结构降噪效果初探

摘要

介绍了路面结构降噪物理特性，利用废旧橡胶沥青SMA混合料作为路面结构降噪材料，探索其隔声性能的现场监测方法。选取南京绕城公路一段作为监测路段，对采用普通沥青路面和采用SMA材料的结构降噪路面进行比对监测，结果显示采用SMA材料的结构降噪路面声级值降低1～1.8dB。分析认为交通噪声主要声源为驱动噪声，而驱动噪声中主要噪声部分为排气噪声，所以对于路面行驶噪声的降噪对于交通噪声整体声级的改善作用有限。%The physical properties of noise reduction through road structure were presented.The effect of noise re-duction of one new material of asphalt SAM mixture modified by waste rubber was explored as well as the on-site monitoring methods.One section of road in Nanjing ring road was selected to carry out the monitoring work to com-pare the effects of the ordinary road and the road with new materials.The results showed that the sound of the road with new materials was only 1 to 1.8dB lower than that of the old road under the similar traffic condition.The major source of traffic noise comes from the engine.Meanwhile,the exhaust noise contributes the most noise.Therefore, it is limited to reduce the traffic noise through improving the road structure.