不同空隙结构沥青混合料对路面径流污染的控制效能

摘要

为了明确透水路面控制路表径流非点源污染的功效，在明确路表径流污染主要评价指标基础上，从不同空隙结构沥青混合料的材料组成角度研究其控制路表径流污染的效能。试验结果表明，具有不同空隙结构的多孔沥青混合料对路表径流均具有一定的有机污染物和固体悬浮物的去除效果，去除效果与沥青混合料的空隙结构形成因素有关。在充分压实基础上通过级配设计所形成的不同空隙结构中，随着空隙率的降低，污染物去除效果越明显，兼顾透水与去污效果，推荐沥青混合料的有效空隙率为20％左右。%In order to clarify the controlling efficiency of runoff pollutant by porous asphalt ,the effi-ciency of controlling runoff pollutant has been studied from materials of porous asphalt based on the determining the main value indices of runoff pollutant .The experiment results show that the porous asphalts with different void structure all have certain removal effect on COD and SS .The removal effect is related to the form of void structure .On the basis of efficient compaction and gradation de-sign ,the removal effect is better with the decrease of void ratio .Balance to the permeability and re-moval effect ,the effective void ratio of porous asphalt is recommended to be 20% .