多孔橡胶改性沥青混合料吸声特性与应用研究

通过室内试验对废旧橡胶改性沥青混合料吸声特性进行了研究。室内试验表明:8.0%的沥青掺入量是橡胶沥青混合料的最佳沥青用量值;橡胶改性沥青混合料的吸声性能随着试件厚度增加而增加;橡胶改性沥青混合料的孔隙越多,表面越粗糙,吸声性能越好;考虑经济效益,建议取橡胶粉的掺入量为15%。工程实例表明橡胶改性沥青降噪路面具有良好的降噪效果,其降噪性能平均比SUP与AC路面降低了约3 d B,比SMA路面降低了1.5 d B,降噪效果优异。

Sound Absorption Characteristics and Application of Porous Rubber Modified Asphalt Mixture

In this paper the sound absorption characteristic of waste rubber modified asphalt mixture is studied by labora-tory test .The results show that 8% asphalt mixture quantity is the best asphalt content of rubber asphalt mixture ;the sound absorption performance of rubber modified asphalt mixture increases with the increase of specimen thickness ;the more pores of rubber modified asphalt mixture ,the more rough the surface ,the better the sound absorption ;considering the economic benefits ,it is suggested that the incorporation of rubber powder is 15% .Engineering examples show that :rubber modified asphalt pavement noise reduction has a good noise reduction effect ,its average noise reduction perfor-mance is lower than SUP and AC pavement reduced by about 3 dB ,SMA pavement than 1 .5 dB .