胶粉改性沥青路面材料的降噪性能

Noise-reducing performance of rubber powder modified asphalt pavement materials

采用湿法改性工艺,分别用超细全硫化粉末丁苯橡胶和废橡胶粉对沥青进行改性,分析了改性沥青的降噪机理,用动态热机械分析仪研究了改性沥青的动态力学性能,并进行了降噪模拟测试。结果表明,胶粉改性沥青的复合模量明显高于基质沥青,抵抗外力的能力强;胶粉添加量较高改性沥青的降噪效果较好;在交通噪声的频率范围内,加入20份(质量)废橡胶粉或超细全硫化粉末丁苯橡胶的改性沥青对声波的衰减作用明显优于基质沥青,胶粉改性沥青路面材料的降噪能力来源于阻尼减震和对声波衰减的共同作用。

Ultra-fine full-vulcanized styrene-butadiene rubber powder and waste rubber powder modified asphalts were prepared by wet processing.The noise reduction mechanism was analyzed,the dynamic mechanical properties of the modified asphalts were studied through dynamic thermomechanical analysis,and the noise reducing simulation experiments were conducted.The results showed that the complex modulus of rubber powder modified asphalts was larger than that of base asphalt,implying that the modified species had larger ability against external forces.The noise reduction effect increased with increasing the level of rubber powder.In traffic noise frequency range,the sound wave attenuation of modified asphalt with 20 phr waste rubber powder or ultra-fine full-vulcanized styrene-butadiene rubber powder was superior to base asphalt.The ability came from damping together with sound wave attenuation.