微表处级配及外加剂对路面行车噪音的影响

Effect of Surface Texture at Micro-surface Pavement on Driving Noise

微表处路面的行车噪音相较于热拌沥青混合料路面更大,过大的噪音严重制约着微表处路面技术的推广应用。采用室内加速加载试验,结合自主研发的噪声测试系统,以油毛毡试件的形式,研究了微表处级配、外加剂类型对微表处路面行车噪音的影响。结果显示:微表处级配越细的、微表处路面轮胎振动加速度越小;试验过程中的噪声值和振动加速度变化值较为稳定,不随时间增长而产生较大波动;橡胶颗粒以及纤维颗粒的掺入均能有效降低原微表处路面噪声。

The traffic noise of micro-surface pavement is larger than that of hot mix asphalt concrete pavement,and the excessive noise seriously restricts the popularization and application of micro-surfacing pavement technology.Through the indoor accelerated loading test and the self-developed noise test system on the linoleum specimen,the influence of the micro-surfacing gradation and the admixture type on the road noise of the micro-surfacing pavement was studied.The results show that:the finer the gradation at the micro-surfacing,the smaller the vibration acceleration of the road tire.The noise value and vibration acceleration change value during the test are relatively stable,and do not fluctuate greatly with the increase of time.The incorporation of rubber particles and fibre particles can effectively reduce the road noise on the original micro-surfacing pavement.