The application of bentonite as electrical grounding improvement material (GIM) has beeninvestigated. Bentonite is a type of clay which has high tendency to absorb and retain water, andswells. This property makes it desirable for applications in grounding system improvement as theycould result in lowering as well as minimizing the fluctuation of ground resistance over a long periodof time. However, these properties depend on the type of bentonite. Commercially, there are two typesof available bentonite; namely sodium bentonite and calcium bentonite. Several experiments wereconducted to determine the chemical composition, water absorption rate, swelling capability; densityand resistivity of calcium bentonite since such information are not available in the literature.
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