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Granulated blast furnace slag is the residue produced from steel-making plants. Waste utilisation is an attractive alternative to disposal in that disposal cost and potential pollution problems are reduced. Nowadays the use of slag in concrete, either as a constituent of cement or as a mineral admixture, is widespread. The granulated blast furnace slag has low resistivity, and so can be used as an agent for reducing resistance to grounding. The grounding resistance reduction agent was determined by considering various proportions of water, cement and salt. Experimental results demonstrate that the proposed approach can effectively reduce the grounding resistance.