Abstract

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Title:: Effect of permeable asphalt pavement on quality of clean water and surface runoff

Author(s):: JIANG Wei; SHA Ai-min; XIAO Jing-jing; WANG Zhen-jun; NIU Ji-qiang; 1. Key Laboratory for Special Area Highway Engineering of Ministry of Education, Chang’an University, Xi’an 710064, Shaanxi, China; 2. School of Civil Engineering, Chang’an University, Xi’an 710061, Shaanxi, China; 3. School of Materials Science and Engineering, Chang’an University, Xi’an 710061, Shaanxi, China

Keywords:: road engineering; permeable asphalt pavement; surface runoff; filtration; infiltration test

Abstract:: Researchers are paying more attention to permeable asphalt pavement (PAP) due to its various advantages including of reducing surface runoff, as well as enhancing driving security in rainy days. Surface runoff contains a large number of pollutants. The contaminated water with large volume of pollutants can permeate into the subgrade through permeable asphalt pavement and finally pass into the underground water. Therefore, the quality of water permeating into the subgrade should be seriously detected. Infiltrate testing apparatus of PAP was used in present study to obtain the influence of PAP on clean water and surface run off, which consisted of a 6.3 cm-thick PAC layer, a 30 cm-thick open-graded gravel layer and a 15 cm-thick natural sand layer. Design idea of the roadside drainage facility was put forward for PAP structure. The results show that after the filtration through PAP, the pollutant concentrations of clean water increases at the sampling time of 0 min. The pollutions concentrations, except petroleum pollutants, are less than the initial clean water when the sampling time increases to 60 min. PAP has high removal efficiency on heavy metal pollutions, such as Cu, Zn, Pb and Cd. It can effectively remove petroleum animal & vegetable oil, BOD, COD, NH4-N and TP as well. However, PAP is incompetent with the removal of Cl^- and TN. With the increase of collection time of samples, the contents for all pollutants in water decrease with different degrees.