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FGD SCRUBBER WASTE
In 1972, FHWA used 5 inches of scrubber waste in a parking-area base at Washington's Dulles Airport. 2 years later, wet weather caused the experimental base to soften and be replaced- In 1977, Pennsylvania tested an 800-foot road base made with power-plant scrubber sludge; its strength rose from 720 to 1,014 PSI over seven years
- Florida turned scrubber waste into road base in 12 projects by 1989; 100,000 tons earned highly satisfactory ratings, transforming an industrial byproduct into useful road base
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