Permeable asphalt pavement (PAP) provides a promising method for controlling the pavement runoff, which is known as non-point source pollution. Since porous asphalt concrete (PAC) serves as an important part of PAP structure, this paper aims to study the feasibility of using activated carbon in porous asphalt mixture for improving the filtration effectiveness of pavement runoff. The effect of activated carbon on the optimum asphalt content, engineering properties and filtration characteristics of PAC were investigated by a series of laboratory tests. Abrasion loss and binder drainage tests results show that activated carbon increases the optimum asphalt content of porous asphalt mixture due to its high absorptivity and surface area. PAC strength is affected by softening effect of high asphalt content and stiffness effect of activated carbon. In addition, PAC sample with activated carbon that entirely substitutes for the mineral filler is superior in moisture stability and filtration effectiveness compared to the control sample without activated carbon. Activated carbon can modify the absorptivity of asphalt film and therefore improves the pollution removal rate for PAC. Moreover, acidic compound residues on the surface of activated carbon would infiltrate into runoff solution and slightly decreases the runoff pH value. Furthermore, the effect of thickness and air void content on pollutant removal rate of PAC sample shows different trends. PAC layer with a thickness of 6 cm and an air void content of 18% is recommended for permeable asphalt pavement to obtain the optimum filtration effectiveness of pavement runoff.

渗透性沥青路面（PAP）为控制路面径流提供了一种有前途的方法，这被称为非点源污染。由于多孔沥青混凝土（PAC）是PAP结构的重要组成部分，因此本文旨在研究在多孔沥青混合料中使用活性炭改善路面径流过滤效果的可行性。通过一系列的实验室测试，研究了活性炭对PAC最佳沥青含量，工程性能和过滤特性的影响。磨耗损失和粘结剂排水试验结果表明，活性炭由于其高的吸收率和表面积而增加了多孔沥青混合物的最佳沥青含量。PAC强度受高沥青含量的软化作用和活性炭的刚度作用影响。另外，与不含活性炭的对照样品相比，具有完全替代矿物填料的活性炭的PAC样品在水分稳定性和过滤效果方面更为出色。活性炭可以改变沥青薄膜的吸收率，因此可以提高PAC的污染去除率。此外，活性炭表面上的酸性化合物残留物会渗入径流溶液中，并略微降低径流的pH值。此外，厚度和气隙含量对PAC样品污染物去除率的影响呈现出不同的趋势。对于渗透性沥青路面，建议使用厚度为6厘米，空隙率为18％的PAC层，以获得最佳的路面径流过滤效果。与不含活性炭的对照样品相比，具有完全替代矿物填料的活性炭的PAC样品在水分稳定性和过滤效果方面具有优势。活性炭可以改变沥青薄膜的吸收率，因此可以提高PAC的污染去除率。此外，活性炭表面上的酸性化合物残留物会渗入径流溶液中，并略微降低径流的pH值。此外，厚度和气隙含量对PAC样品污染物去除率的影响呈现出不同的趋势。对于渗透性沥青路面，建议使用厚度为6 cm且气隙含量为18％的PAC层，以获得最佳的路面径流过滤效果。与不含活性炭的对照样品相比，具有完全替代矿物填料的活性炭的PAC样品在水分稳定性和过滤效果方面具有优势。活性炭可以改变沥青薄膜的吸收率，因此可以提高PAC的污染去除率。此外，活性炭表面上的酸性化合物残留物会渗入径流溶液中，并略微降低径流的pH值。此外，厚度和气隙含量对PAC样品污染物去除率的影响呈现出不同的趋势。对于渗透性沥青路面，建议使用厚度为6 cm且气隙含量为18％的PAC层，以获得最佳的路面径流过滤效果。