Abstract
A low cost unified system for relative gas diffusivity（Dp/D0）and air permeability（ka） measure-ments has been developed. Instead of the conventional sliding‒mechanism, plastic films’ shutter has been pro-posed for the Dp /D0 measurement. While for the ka measurement, a method has been introduced by utiliz-ing the principle of Mariotte’s bottle and manometers instead of much costing air pump, mass flow meter, and pressure sensor/gauge. The measured Dp/D0 and ka of Toyoura sand were in a good agreement with those obtained in the literature, and the proposed method enabled to lower the apparatus cost up to 40 % of the common method cost.
