Permeability of hot mix asphalt (HMA) is an important property that influences asphalt’s resistance to moisture damage. All current methods used by pavement engineers rely on measuring vertical permeability. However, it has been shown recently that the horizontal permeability can be much higher than the vertical one due to the anisotropic and heterogeneous nature of air void distribution. Labor...

Western hemlock (Tsuga heterophylla) is a prevalent coastal species in British Columbia (BC). Its wood has high potential for thermal modification, process that can affect numerous physical properties, including air permeability. The current study investigates the longitudinal permeability of modified at three temperature levels, 170 °C, 212 and 230 two-hour treatment length. Permeability value...