CONCRETE PAVEMENT PROGRESS 10 WWW.ACPA.ORG CONCRETE PAVEMENT RESTORATION Interim Expansion of RW 15 Hold Bay and Associated Pavement Improvements Washington, District of Columbia CONTRACTOR: Lagan Construction, LLC* OWNER: Metropolitan Washington Airports Authority ENGINEER: RDM International, Inc.* SILVER I-76 Wiggins WB Pavement Rehabilitation Weld/Morgan County, Colorado CONTRACTOR: Castle Rock Construction Company* OWNER: Colorado Department of Transportation ENGINEER: Colorado Department of Transportation Parking Position 350 and Hold Bay 15 are located near the north end of Taxiway N at Reagan National Airport. Most of the concrete and asphalt concrete (AC) pavement areas were determined to be in “poor” or “very poor” condition based on the records in the previous Pavement Management System Update performed by RDM International. A future realignment for Taxiway N is planned and will impact the future geometry of Hold Bay 15, so an objective for the rehabilitation project was to improve the current functional condition and provide a minimum of five years of operational life to create ease of the proposed future realignment. Significant slab failures and structurally related distresses in the original portland cement concrete (PCC) pavement in Hold Bay 15 also make it unsuitable for the anticipated traffic following the taxiway realignment. The short-term solution was to repair the current distresses to mitigate the potential of foreign object damage hazards for five years. To expand the Hold Bay through Parking Position 350, PCC reconstruction was recommended to address future heavy aircraft use and the current slow-moving/ static loading condition. The existing AC pavement section was milled to a depth of 16 inches for the construction of a new 16-inch PCC surface on top of the existing cement treated base layer to address current surface defects for depressions and rutting. For Parking Position 350, a long-term solution was required. Rutting was a repetitive issue for the existing AC-surfaced pavement, and previous patching repairs were not effective. The projected future use of the parking position by heavier aircraft made the choice of PCC for the rehabilitation project necessary. Rehabilitating a 7-mile stretch of the westbound I-76 lanes west of Wiggins, Colorado, required removing 35,000 square yards of damaged concrete panels to their full depth and replacing them on-site with an optimized concrete mix. To improve ride and paving surface consistency, both lanes were diamond ground from the first of the project until the end. A 100-working-day time frame for the scope of work was daunting. In addition to removing and replacing damaged panels with a 1-inch asphalt bond breaker and grinding and texturing 96,755 square yards of slab, the contractor also had to saw and seal 144,917 linear feet of joints. All contractors on the project contributed to meeting the schedule, including committing full human and equipment resources. For example, four grinding machines were on-site to grind all 7 miles of the travel lanes. CRCC also removed and replaced 31 panels at their own expense to enable continuous paving for both the concrete and the asphalt bond breaker and to minimize the number of headers that required grinding. Overall, the paving schedule was the key to meeting the deadline, and all activities occurred concurrently. The schedule had the driving lanes paved first, then the passing lanes. Saw and seal happened at the front end with saw cutting of existing joints, and as the paving crew was halfway on the driving lanes, the grinders went to work. The timing of completion was key since each crew’s work followed closely to the previous crews’ work. GOLD
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