降噪微表处技术在京港澳高速沥青路面中的应用

Application of Noise Reduction Micro-surfacing Technology in Asphalt Pavement of Beijing-Hong Kong-Macao Expressway

为了降低高速公路由于高速行车而产生的噪音,改善驾驶人员的行车舒适性,研发了一种降噪微表处技术。通过调整混合料配合比,主要以调整级配为主,将2.36 mm作为关键筛孔,对备选的配合比方案进行室内试验验证及吸声效果评价,最终优选出路用性能满足要求,且降噪效果较好的微表处混合料配合比方案。研究发现,提高2.36~4.75 mm粒径矿料通过率,并降低2.36 mm以下粒径通过率的级配设计,能够减小构造深度,进而有效降低微表处噪音。经实体工程验证,降噪微表处的路用性能满足规范要求,且吸声效果与中值级配微表处路面相比降低3~4 dB。

In order to reduce the noise caused by high speed driving and improve the driving comfort of drivers,a noise reduction micro-surfacing technology was developed.By adjusting the mixing ratio,which is mainly gradation adjustment,with 2.36 mm as the key mesh,the alternative mixing ratio scheme was verified by laboratory test and the sound absorption effect evaluation.Finally,the scheme for the micro-surfacing with satisfactory pavement performance and noise reduction effect was selected.The study found that the gradation design that improves the pass rate of 2.36-4.75 mm particles and reduces the pass rate of particles below 2.36 mm can reduce the structural depth and effectively lower the noise.It has been verified by practical application that the pavement performance of the prepared noise reduction micro-surfacing meets the specification requirements,and the noise is reduced by 3-4 dB compared with the median graded micro-surfacing.