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materials from the original roadway investment. FDR conserves virgin construction materials, saves fuel, and truck loads from tearing up the road. This process of reusing roadways and saving resources is moving Coweta County to a leadership role in sustainability. The process starts by evaluating the condition of the existing pavement including the sub-layers and preparing a mix design. Next, pulverization sizes the materials back down to a two–inch minus material. A predetermined amount of portland cement and water is blended into the pulverized material. Reshaping, proper compaction, grading and curing follow. This gives the new base the strength and durability to achieve long lasting, cost effective pavements. By addressing the entire pavement section, FDR is able to correct delinquent cross sections, widen roads, increase the load-bearing strength of the base, and utilize 100 percent of the existing materials. Substantial savings can be attained while meeting environmental goals. Cement stabilization increases the stiffness and strength of the base material. A stiffer base reduces deflections due to traffic loads, which results in lower strains on the asphalt surface and sub-grades. A cement treated base also forms a moisture-resistant layer that keeps out water that routinely destroys untreated aggregate bases thereby resulting in potholing and alligator cracking. FDR provides higher load carrying capacity utilizing the cement treated component. Crown and slope correc- tions, drainage problems, reflective cracking, rutting, and potholing are all corrected. Road widening can easily be accomplished during the FDR process creating a much safer road. According to a research study contracted by the Portland Cement Association evaluating the FDR process over the last 20 years roads that were reconstructed using the FDR process had a life expectancy up to three-times of nontreated roadways. “Even before the cost of asphalt went sky high, FDR with cement was a better value than deep patching,” said Landrum. “By utilizing FDR on our major roadways providing a stabilized rigid base, we are expecting our asphalt investment to double or perhaps triple in longevity.” The county plans on bidding an additional ten plus miles of FDR this year. FDR Becomes Foundation for Holiday Season F For rehabilitation of its deteriorated asphalt parking lot, J.C. Penny chose recycling with FDR. ull-depth reclamation (FDR) with portland cement was the clear choice in the recent rehabilitation of a 15,000 yd2 parking area at the Hanes Mall of Winston Salem, N.C. In need of a facelift, the parking area of JCPenney underwent a transformation just in time for the winter holiday season. The parking area, consisting of severely cracked and oxidized asphalt surfacing, was in desperate need of repair. A regional office of Professional Service Industries, Inc. (PSI) located in Charlotte, N.C. decided to include FDR in the contract bid as an alternate to the traditional “remove and replace” base reconstruction of the JCPenney parking area. A 2-inch asphalt surface course would provide the riding sur- face. The FDR was designed for a 40 lbs/yd2 portland cement application rate to a depth of 12 inches. When bids were opened, FDR was the “clear choice due to its overwhelmingly lower bid and shorter construction schedule compared to the complete reconstruction option” said Don Brown, project manager for PSI. The project was awarded to Thompson Arthur Paving of Greensboro, N.C. who selected Propst Construction of Concord, N.C. to perform the FDR work. Construction work began on September 17, 2007 with the complete pulverization of the parking lot using a CMI-Terex RS-425B. After complete pulverization, a small amount of material was removed to accommodate the 12 Special advertising supplement to the McGraw-Hill Construction Regional Publications

Full-Depth Reclamation

Table of Contents for the Digital Edition of Full-Depth Reclamation

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