These are used for building or are broken down for use as an aggregate for concrete or as ballast chippings.

砖材用于建造房屋，或将其破碎作为混凝土骨料和铺道渣。

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Built in 1997 with 1.2 million tons of concrete and ballast, Hibernia (ChevronTexaco owns 27%) sits on some 700 million barrels, producing 150, 000 barrels a day.

FORBES: On The Cover/Top Stories

Built in 1997 with 1.2 million tons of concrete and ballast, Hibernia (ChevTex owns 27%) sits on some 700 million barrels, producing 150, 000 barrels a day.

FORBES: On The Cover/Top Stories

The line's 3m concrete sleepers are being cast there, and the ballast on which they will lie is quarried nearby.

ECONOMIST: Brazil's north-east