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Screened and ReadyThe ProSizer’s three-deck screening systemprovides versatility for today’s aggregate market.In today’s market and economics, all projects are a challengefor contractors, with competing suppliers (aggregate andasphalt binders) each project seems to be unique. Multiplesources are blended to utilize the most cost effective advantageavailable and that seems to change with each project.In 2008, RK Hall utilized approximately 200,000 tons of FRAP(fractionated reclaimed asphalt pavement) and expects 2010 tobe the same; all will be processed either with its stationary inTexarkana or with its portable Astec Mobile Screens’ ProSizer.“We are reclaiming asphalt at every opportunity available andstockpiling it according to the nominal aggregate size and theasphalt binder grade,” says Brad Bankston, RK Hall operationsmanager. “This separation requires stockpile room, but theadvantages certainly outweigh the burden.ELIMINATES OVER CRUSHINGThis allows the FRAP to be processed and sized with little to nocrushing of the RAP aggregate. The screens can be changed toaccommodate the aggregate size, this eliminates over crushing,and helps control the wear on the crusher units.Currently, RK Hall is utilizing 3 to 5 percent shingles—bothmanufactured waste as well as tear-offs. The new stationaryProSizer 3612V is located at its Texarkana plant. This plantproduces mix for three states because of its geographicallocation.“Each state has its own unique requirements, so we need to beversatile with the product,” says Bankston. “The ProSizer allowsthis versatility with the three-deck screening system.”MEETING CUSTOMER NEEDSWith the implementation of the new TxDot specificationsallowing the use of RAP, RAS (reclaimed asphalt shingles), andsubstitute binder grades to achieve the end performance, thecriteria has been extremely challenging. According to Bankston,one must understand the quality and components of theavailable RAP and RAS, and how the combination will perform.“First, we must provide our customer with a quality product thatwill meet spec and perform; we then have to be as economicalas possible to stay competitive,” says Bankston. “The key tosuccess is to maintain a very well trained and informed QCQA28 volume 3, number 1 | Today’s aggregate & mining solutions