CIVIL ENGINEERING 365 ALL ABOUT CIVIL ENGINEERING



AbstractPorous asphalt concrete (PAC) has the benefits of good drainage performance and excellent skid resistance. In double-layer porous pavement, the top layer ensures good pavement performance, and the bottom layer maintain the lateral drainage capacity with the air voids content. However, there is no uniform layer thickness design for double-layer porous asphalt pavement. This study determined the optimum asphalt binder contents of PAC-13 mixtures, and investigated the influence of high-viscosity modifier on the PAC-13 mixture. The laboratory properties related to filed performance were obtained, including high-temperature stability, water stability, high-temperature performance, low-temperature performance, and water permeability. The PAC-13 mixture modified with 10% high-viscosity modifier C (HVM-C) and 0.4% polyolefin was used as the mixture for the top layer, and the PAC-13 mixture modified with 3.3% HVM-C and 0.4% polyolefin was used as the mixture for the bottom layer. The optimum binder content was found to be 4.8% for top-layer PAC-13 mixture and 4.7%–4.8% for bottom-layer PAC-13 mixture. In terms of rutting resistance performance, there was an increasement of 14.6% for the dynamic stability indicator when the HVM-C content increased from 3.3% to 10%. The low-temperature performance, moisture sensitivity, and permeability of the tested mixtures met the standard requirement.



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