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Old Dixie Highway Roadway Coring Page 4 <br />Project No. PSL -10-3054 (BG 10.5) <br />requirements. Based on the aforementioned considerations and requirements, the following are the <br />recommended rehabilitation alternatives in an order of cost. <br />Full Depth Reclamation (FDR) with Addition of Paved Shoulders,: FDR is a rehabilitation <br />technique in which the entire thickness of the asphalt pavement and a predetermined portion of <br />the underlying base, or subgrade is uniformly pulverized and blended to produce an upgraded, <br />homogeneous material. Given the condition and composition of the existing roadway <br />components, we would recommend (1) the top twelve (12) inches of the roadway material is <br />pulverized and mixed Nvith the stabilizer at a pre -determined content. (2) The top 3 -inch mixture <br />is removed and used to construct base course for shoulder and the remained mixture on the main <br />lines is compacted to build a 9 -inch thick FDR base course. (3) Two lifts of 1.5 -inch Superpave <br />asphalt mix (Traffic Level C) shall be placed as structural/wearing courses of the roadway. <br />1. Benefit: With the FDR process, pavement cracks are totally eliminated and structural <br />issues with asphalt and base can be addressed. FDR also allows the structural capacity of <br />the roadway to be increased by deepening the depth of recycling; the road can be opened to <br />traffic immediately after compaction. <br />2. Unit Cost: Total $20 per SY consisting of $7 per SY to construct a 9 -inch thick FDR base <br />course, and $13 per SY for two lifts of 1.5 -inch Superpave asphalt (Traffic Level C) <br />overlay. The cost of shoulder construction should also be considered. <br />3. The expected life of FDR with this overlay is 10-20 years; which is the same life as a total <br />reconstruction project. <br />4. Life -cycle Cost Estimate: $142 per SY per year. <br />Partial milling with Geofabric (Pet•omat): Cracks left in the underlying layers will reflect up <br />through overlays due to the stress concentrations at the cracks from thermal movements and/or <br />load deflections. This movement causes overlays to deteriorate faster than would be indicated <br />strictly by structural number calculations. The Petromat will reduce the stress concentration by <br />providing a reflective crack bridging layer while the overlay thickness would reduce the load <br />deflection. <br />I . Benefit: This repair takes less time compared to the first alternative. <br />2. Cost: Total $19.5 consisting of $1.5 per SY for 3 -inch milling, $5 per SY for Petromat <br />installation, and $13 per SY for two 1.5 -inch lifts of Superpave 12.5 (Traffic Level C) <br />overlay (total of 3 inches). <br />3. The expected life of this alternative is 6-15 years. <br />4. Life -cycle Cost Estimate: $1.3-$3.25 per SY per year. <br />Partial milling/resurfacing: This option will involve conventional milling/resurfacing which only <br />removes part of the cracking and the reflective cracking can be anticipated during the following <br />service life. <br />1. Benefit: This repair takes less time and money compared to other alternatives. <br />2. Cost: Total $14.5 per SY consisting of $1.5 per SY for 3 -inch milling, and $13 per SY for <br />two 1.5 -inch lifts of Superpave 12.5 (Traffic Level C) overlay (total of 3 inches). <br />3. The expected life of this alternative is 2-5 years. <br />4. Life -cycle Cost Estimate: $2.9-$7.5 per SY per year. <br />DUMMSERGER <br />