Pennsylvania uses fly ash to strengthen roads, bridges

05/26/2009 | Pittsburgh Tribune-Review

The Pennsylvania Department of Transportation is using fly ash from power plants and blast-furnace slag from steel mills to replace a portion of the cement used to make concrete for roads, sidewalks and bridges. In fact, new state standards being developed for concrete are so strict that suppliers cannot meet them without using fly ash or slag, observers say. They also say the ash and slag make concrete less vulnerable to damage caused by water and salt.

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