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Which of the following materials is/are used as backfill around the anode in impressed currents?

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Which of the following materials is/are used as backfill around the anode in impressed currents?

(a) Coke breeze

(b) Gypsum

(c) Bentonite

(d) Coke breeze, gypsum, and bentonite

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I'm obligated to ask this question of Cathodic and Anodic Protection in portion Corrosion Prevention of Corrosion Engineering

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Correct choice is (d) Coke breeze, gypsum, and bentonite

The explanation is: Coke breeze, gypsum, and bentonite are the materials that are used as backfill material around the anode. These materials improve the electric contact between the anode and surrounding soil.

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