Analysis of Permeability and Dielectric Properties of Porous Asphalt Concrete

• Main Authors: Yung-ChiuanChen, 陳永全
• Other Authors: Jian-Shiuh Chen
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/22749086994518544697

碩士 === 國立成功大學 === 土木工程學系碩博士班 === 98 === Porous asphalt concrete is designed with high porosity, with equivalent permeability. It can effectively reduce the possible rain water in the street, and to increase the surface friction, reducing the possibility of wheel slip. PAC can also reduce traffic-induced noise by absorbing noise. Pores will be clogged by sand and reduce porosity, resulting in permeability properties decreasing. Laboratory falling-head test measure K value has a good consistency with constant-head test. Falling-head test can measure K value on different water head, used to assess the drainage rate of PAC, and more understand the drainage characteristic of PAC. Research found, the rate of drainage is not proportional change with the thickness or head height, so K value can not maintain a constant value. Evaluating the effect of clog and compaction in laboratory drainage test, and then assess the in-situ permeability. Results shows KC/KO will decreased to 0.44. Clearing clog by suction will make KC/KO recovered to 0.58. High viscosity asphalt resistance to rutting best, then modify type III asphalt, AR-8000. Rutting has not obvious effect on vertical drainage, but except of HA with increase of rutting deformation, with decrease of permeability. By the relationship between K value and deformation can be constructed out of the pavement permeability model. Dielectric measurement as a kind of non-destructive testing, through the transmission and reflection of electromagnetic waves, which can effectively measure pavement thickness and density. To evaluate the change of pores between clog and deformation by dielectric measurement and experimental methods. Then constructing PAC density prediction model, and assess the relationship between K value and dielectric value. Key Words: permeability, falling-head test, dielectric value