2.3.5 Conductivity test
Two copper meshes are set vertically inside the sample after casting as electrode plates. The size of the copper mesh is 3cm×5cm. The resistanceR of the sample is tested after 28 days of curing. The resistivity of the sample is calculated by Eq. 1, and the conductivity is calculated by Eq. 2. S is the contact area between copper mesh and slurry, which is 9cm2 in this study. L is the distance between two copper meshes. The instrument used is an electronic multimeter produced by Elecco Electric Co., Ltd.
\(\rho=RS/L\) (Eq. 1)
\(k=1/\rho\) (Eq. 2)