抗滑阻燃沥青路面降噪性能的研究与应用

Assessment and application on Noise-damping Performance of Antiskid and Fire-retarding Asphalt Pavement

采用驻波法和混响室法测试课题组研究的抗滑阻燃沥青路面(NAFA)、沥青玛蹄脂碎石路面(SMA)与普通AC沥青路面材料的吸声系数,并对武汉-英山高速公路(谌家矶段)铺设的抗滑阻燃沥青路面试验路段进行现场噪声测试,评价路面的降噪性能,分析表明:3种路面材料中,NAFA有效孔隙率多,表面构造发达,故其吸声性能优异,驻波管法测平均吸声系数达到0.4以上,混响室法达0.45.在800～1200Hz噪频区域,驻波管法所测峰值吸声系数达到0.67,混响室法达1.00,说明NAFA降噪性能优异.现场测试结果亦证明NAFA沥青路面能够有效吸收路面噪声,降噪水平达4.7dBA.

The paper used stationary wave method and reverberation chamber method to test the sound absorption coefficient of antiskid and fire-retarding asphalt pavement,stone matrix asphalt and asphalt concrete pavement,and paved antiskid and fire-retarding asphalt pavement in the expressway from Wuhan to Yingshan（the part of Chen Jiaji）,where we conducted test and assessment on the noisedamping performance.The analysis shows that of the three asphalt pavement materials,NAFA has high effective porosity and developed superficial structure,so it has good sound-absorption performance,and the average sound absorption coefficient reached more than 0.4by stationary wave method while got 0.45by reverberation chamber method,and between 800～1200Hz the peak of sound absorption coefficient reached more than 0.67by stationary wave method while got 1.00by reverberation chamber method,which indicated the good noise-damping performance of NAFA.The results of the spot test also shows that NAFA could absorb the noise efficiently,and the noise-damping level would climb to 4.7dBA.