硅藻土复合改性橡胶沥青混合料降噪性能研究

Research on Noise Reduction Performance of Diatomite Compound Modified Rubber Asphalt Mixture

现阶段在降噪型沥青路面材料选择中,橡胶沥青路面可通过利用其显著的阻尼变形特性来实现噪声削减。但其吸声能力相较于其他沥青路面材料并无显著优势。现通过向橡胶改性沥青中添加不同比例的硅藻土,制备得到复合改性橡胶沥青,进而制备两类沥青混合料试件,利用传递函数法测试吸声系数,从而研究硅藻土掺量和试件层厚对两种复合改性橡胶沥青混合料吸声系数的影响规律。结果表明:随硅藻土掺量的增加,各组试件吸声系数随之提升;试件层厚对两种沥青混合料试件的整体吸声系数影响不大,但峰值吸声系数有明显区别。

At this stage,in the selection of noise-reducing asphalt pavement materials,the rubber asphalt pavement can achieve the noise reduction by using its significant damping deformation characteristics,but its sound absorption ability has no significant advantage compared with other asphalt pavement materials.In this study,the different proportions of diatomaceous earth are added to the rubber modified asphalt to prepare the composite modified rubber asphalt,and then two types of asphalt mixture specimens are prepared.And the sound absorption coefficient is measured by the transfer function method so as to study the influence of the diatomite content and the specimen thickness on the sound absorption coefficients of two composite modified rubber asphalt mixtures.The results show that with the increase of the diatomite content,the sound absorption coefficient of each group of specimen increases.The thickness of the specimen layer has little effect on the overall sound absorption coefficient of the two asphalt mixture specimens,but the peak sound absorption coefficient is obviously different.