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OTHER IMAGES 

5 SEM Images of FLY Ash:

 Above image is Class C Fly Ash

Fly Ash (Courtesy of American Coal Council)

Boiler slag (Courtesy of CAER.UKY.EDU)

Bottom Ash (Courtesy of CAER.UKY.EDU)

Cement vs Silica Fume vs Fly Ash (Courtesy of Michigan Technological University)