SATURATED-UNSATURATED HYDRAULIC PROPERTIES OF POROUS ASPHALT MIXTURE

Abstract

  A permeable pavement, which is one of pavements with various advanced functions, has been expected to improve the urban environments by the pervious surface structures. Because we need to determine the water retention and permeability characteristics of pavement materials in order to evaluate the rainfall storage and infiltration facilities of the permeable pavement, we conducted a series of laboratory tests using porous asphalt mixture specimens having a diameter of 150mm which consist of several different kinds of maximum grain size, void ratio and specimen length. The experimental results show that the Van Genuchten model predicts the water retention curves and the Irmay model predicts the unsaturated permeability coefficients of such materials very well, respectively.