针对沥青路面噪声污染日益严重及橡胶沥青路面吸音降噪性能有待提升的问题,采取向橡胶沥青混合料中添加硅藻土的方式对其进行吸音降噪特性的研究.通过制作AR-AC-13、AR-SMA-13两种级配下不同硅藻土掺量的橡胶沥青混合料的试件,将不同硅藻土掺量及不同厚度的混合料试件采用驻波管法进行测试,最后得出其在不同频率下各自的吸音系数.研究结果表明随着硅藻土掺量的升高两种级配的混合料吸声降噪特性均得到明显的提高,而试件的厚度对于其吸声降噪特性的影响较小但是对吸声系数的峰值有较大影响.%For the problem of increasingly serious noise pollution of asphalt pavement and the noise reduction characteristics of asphalt rubber pavement need to be improved, research on its noise reduction characteristics has been made by adding diatomite into asphalt rubber mixture. Prepare specimens of asphalt rubber mixture with different diatomite contents under two gradations of AR-AC-13 and AR-SMA-13, test mixture specimens of different diatomite contents and different thickness with adoption of standing wave method and finally attain their sound absorption coefficients respectively under different frequencies. Research results have shown that the noise reduction characteristics of two kinds of graded mixtures have been improved obviously with the increasing of diatomite contents, but the influence of specimen thickness on its noise reduction characteristics is small but the influence on the peak value of sound absorption coefficient is great.
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