The electrical resistivity method is a non-destructive method used for subsurface investigation. This method is extended to the laboratory. In this method a known amount of current is injected into the earth and the resulting potential difference measured. This method is based on the fact that different material offer different resistance to the passage of an electrical current. In the laboratory version of the equipment, same principle is used. This contains a transmitter, a receiver, a sample holder. This has a capability to vary the input current.

The resistivity of the coke sample was measured by 'ABEM-RIPS 3' equipment designed for laboratory measurement of induced polarization and resistivity of the samples. Measurements can be carried out at very low current densities down to 1.25 x 10^-6 A/sqm which is of the same order of magnitude as in ordinary field work. The knowledge of the resistivity helps in deciding the suitability of coke breeze bed in the electrode sites.

The mechanical analysis and chemical analysis of the sample was also carried out.

The paper describes about the methodology adopted, equipment used and the results of the laboratory resistivity test. The results have been correlated to its mechanical analysis and chemical analysis.