Better Roads

November 2013

Better Roads Digital Magazine

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Page 26 of 80

RoadScience Photo courtesy of Randy West To transfer RAP from the bin, the recycle system includes a heavy-duty weigh conveyor that features a channel frame and wind shroud protection for accurate weighing. The conveyor is 2-feet wide and, depending on the model, between 45- and 65-feet long. It introduces RAP to the dried aggregate mix after the heating process. Based on conditions and type of plant, up to 50 percent of the HMA can contain recycled pavement. An optional lump breaker is available for ADM's recycling systems to break down large pieces of RAP into a usable size. It has an adjustable steel breaker plate, replaceable tungstentipped teeth and is powered by a 30-horsepower, high-efficiency motor with an open-mesh covered V-belt drive. Singleand double-deck scalping screens are available so oversized material doesn't enter the aggregate mix. Other options include air cannons, grizzlies, bin extensions, adjustable legs with sand shoes and a skid with bolt-on support legs. Processed RAP stored under cover absorbs less moisture, requiring less heat in the drum plant when incorporated into mix. Web Extra: Read "Optimizing Use by Processing" at sided stockpiles will create segregation within the pile," West said in a 2009 presentation for the Minnesota DOT. As RAP tends to retain moisture, requiring more burner energy in the drum, he suggests minimizing moisture in RAP by using covered stockpiles with a sloped pavement beneath. INDUSTRY LEADING CONSTRUCTION SOFTWARE Equipment optimizes RAP New designs of portable and stationary recycle systems can enhance the costefficiency of asphalt plants while furnishing a finished product that maintains the high quality of a pure virgin aggregate mix, but with the cost savings of RAP. Asphalt Drum Mixers Inc.'s recycle bins feature a 15-ton capacity and are continuously welded at the seams. The bins contain angle irons and midsection stiffeners for reinforcement, and their steeply sloped sidewalls prevent material from plugging or bridging. A tapered discharge opening leads to the direct-drive belt feeder with a 5-horsepower motor, multi-ply belt, self-cleaning tail pulley and adjustable skirt boards. THAT INTEGRATES WITH YOUR ACCOUNTING SYSTEM. Estimating Dispatching Safety GPS Job Costing Equipment Maintenance Fuel Tracking Cloud Hosting Mobile Apps instant Innovative Software for the Construction Industry 800-683-3196 SIGN UP FOR DAILY WEBINARS at Better Roads November 2013 25

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