U.S. Geological Survey: Science for a Changing World - USGS visiaul identifier and link to main Web site at http://www.usgs.gov/

Photograph of the Sunshine Skyway bridge over Tampa Bay in Florida
  Photograph of stacks of high-quality wallboard made from gypsum, a coal byproduct

Figure 5. Photographs showing examples of the uses for coal combustion byproducts. A, Fly-ash concrete was used in the decking and piers of the Sunshine Skyway bridge over Tampa Bay in Florida. B, The gypsum produced by wet scrubbers was used in the manufacture of high-quality wallboard. Photographs from American Coal Ash Association (1998), used with permission.

U.S. Department of the Interior, U.S. Geological Survey
URL: https:// pubs.usgs.gov /circ/c1143/html/fig5.html
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