排水性沥青混合料降噪性能测试研究

研制并开发沥青混合料吸声降噪性能室内测试的仪器,采用单传声器法对不同空隙率以及相同空隙率下不同最大公称粒径的沥青混合料进行吸声系数的测试,并对试验路段的降噪效果进行现场测试。分析空隙率、最大公称粒径对沥青混合料吸声性能的影响。发现空隙率尤其是有效空隙率是影响沥青混合料吸声系数的关键因素;最大公称粒径4 75mm级配的排水性沥青混合料吸声效果明显。结果表明,提高空隙率,采用较小最大公称粒径级配的方案都能有效提高沥青混合料的吸声降噪能力。

Research of Absorption Coefficient of Porous Asphalt

In this paper,with the aim to investigate the influence of air voids and nominal maximum size of aggregate on absorption coefficient of porous asphalt mixture,a device is presented to measure the absorption coefficient.A number of porous asphalt mixture with different air voids and different nominal maximum size of aggregate are tested.And the field measurements of pavement noise are carried out to evaluate potential use of porous asphalt for reducing traffic noise.It is concluded from the study that the absorption coefficient depends upon the air voids of asphalt mixture.And it is also concluded that porous asphalt mixtures with the aggregate of which nominal maximum size is 4.75mm have obvious noise-absorption effects.The research results show that the absorption coefficient of asphalt mixture can be greatly improved by improving air voids and reducing nominal maximum size of aggregate.