F M Frattalone Excavating is presently involved with the construction work underway near the main terminal at the Minneapolis-St Paul International Airport. The material being excavated, which includes demolition concrete and natural limestone, is trucked to a temporary processing site just west of the airport. There, the material is processed and converted into a Class 5 aggregate. It is then trucked back to the same construction site and used as back-fill and base for the new construction. According to Frank, the job will not produce enough raw material to generate all the Class 5 aggregate needed.  However, the recycling operation will be responsible for the bulk of the material used at the airport.

During the interview, a continuous flow of dump trucks made their way up the side of a massive stockpile of dirt, concrete and limestone. Eating away at the side of this stockpile was a CAT980G wheel loader with a 6-1/2 yard bucket. Dan, the loader operator, was attempting to keep the Cedarapids Recycling System charged to capacity--a task which had proved to be a challenge for their larger CAT988B.

The Cedarapids Recycling System is a custom designed, closed-circuit, dual crusher operation. Frank is quick to point out the benefits of his dual crusher system. Not only is the system extremely forgiving, it also enables him to achieve tonnage rates unmatched by other systems. With the ability to bypass fines, and both crushers handling about 350 tons per hour, this system can run upwards of 700 tons per hour when making 3” sewer stone, and 600+ tons per hour when making Class 5 aggregate (1” minus).  At the airport project site, they had converted 54,150 tons of the combined reinforced concrete and shot limestone into Class 5 aggregate at an average of 375 tons per hour. The system consists of the following components.  (next page)

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