Facts & Figures Book - KPI-JCI

filler and a portion of thepolymerized asphalt,the cost of mix can bereduced significantly.F23 shows the gradationsand asphalt contentof the two RAP products.F24 shows the savingsthat result.F25 shows how the RAPactually improves the ruttingperformance. Whenusing minus-16 meshRAP, the material shouldbe fed directly from thescreen to the RAP feederon the asphalt plantdue to its high asphaltcontent. F26 shows ascreening plant feedingdirectly to a RAP bin.The other two sizes arestockpiled for future use.Since the percentage ofliquid varies with the sizeof RAP, 1/4” x 0” RAPmay have as high as 7%liquid, while 1/2” x 1/4”may have less than 4%liquid. Some states placelimits on the percentageof RAP before the gradeof liquid is changed.Using finer RAP allowsa significant reductionof new liquid withoutexceeding the percentageof RAP required.Most important whenconsidering the use ofmultiple sizes of RAP isthe improvement in quality.One producer, using3/4” minus RAP, waslimited to 20% and con-Screenin g177177