MATERIAL ACTIVATION SYSTEMS AIRSWEEP GETS FLY ASH FLOWING FROM ZERO TO 100% OVERNIGHT To produce a higher grade of cement, ready-mix plants often mix fly ash into their product. Used as a catalyst and filler in the ready-mix, the fly ash produces concrete that hardens well and resists cracking. The same characteristics that make fly ash beneficial for the ready-mix, makes the fly ash difficult to handle. THE PROBLEM A Pennsylvania concrete company with six ready-mix plants was experiencing problems with fly ash bridging in bins. The ash was pneumatically conveyed from bulk trucks into an overhead storage bin at the plant. Screw feeders would move the fly ash from the bins into ready-mix trucks where it was mixed with cement, sand and stone within the truck. The sticky fly ash would

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