2.3.3. Electric Resistivity

The electrical resistivity of concrete was determined using nondestructive test equipment RESIPOD as per (ASTM C1876) standard [27] (Figure 4). This test measures the bulk electrical resistivity of moulded specimens or cored segments of hardened concrete after 28 days of curing. The samples were tested after 28 days of water curing based on the practice of Su et al., 2002 [28].

**Figure 4.** (**a**) RESIPOD electrical resistivity apparatus (**b**) Test setup to calculate electrical resistivity.
