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Crushing Rock on the Spot

Granite lies just below the surface of virtually the entire Atlanta Expressway System. Some of it was hauled away, and some of it was crushed and used on-site.

On the Northeast Expressway, MacDougald had to blast through 156,000 cubic yards of granite near the Clairmont Road intersection. A sheer stone face where the cut was made still rises high above the northbound exit ramp at Clairmont. Turning a negative into a positive, MacDougald contracted with Stockbridge Stone Co. to set up a portable crushing plant in the middle of the grading job. So instead of transporting stone for the base and paving materials from the nearest quarry, MacDougald had its own quarry on-site.

Typically, stone encountered at a job site is not of the quality required for highway construction. But this Georgia granite was exactly right, and Stockbridge generated 200 tons of finished material an hour. Stone was blasted and excavated from the cut then fed by conveyor to the primary jaw crusher. A Caterpillar D397 diesel engine and generator set provided electric power for the entire crushing operation, which included the jaw crusher, four conveyors, and more.

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