CONCRETE PAVEMENT PROGRESS 20 WWW.ACPA.ORG RELIEVER & GENERAL AVIATION AIRPORTS Central Wisconsin Airport Runway 17/35 Reconstruction and Associated Taxiway Improvements Mosinee, Wisconsin CONTRACTOR: Trierweiler Construction Company* OWNER: Central Wisconsin Airport ENGINEER: Becher-Hoppe, Inc. SILVER Runway 18-36 Reconstruction - Gould Peterson Municipal Airport Tarkio, Missouri CONTRACTOR: Ideker, Inc.* OWNER: City of Tarkio, Missouri ENGINEER: Olsson Central Wisconsin Airport completed the reconstruction of Runway 17/35 during the 2021 construction season. The reconstruction included longitudinal grade adjustments, connector taxiway reconstruction, safety area grading, navigation aid improvements, parallel taxiway pavement rehabilitation, runway and taxiway LED edge lighting, replacement of air traffic control tower controls, and electrical vault improvements. Trierweiler Construction Company, Inc. was awarded the construction contract for $13.9 million in September 2020. In situ soils at Central Wisconsin Airport are susceptible to differential frost heave due to the variability of silty soils, shallow bedrock, perched water, and springs. The pavement design for Runway 17/35 was developed using FAA pavement design guidance and historical engineering experience at CWA. The 5-foot thick pavement section includes 100% free draining, non-frost susceptible, open-graded rock subbase course layers constructed on compacted subgrade. The open-graded crushed aggregate subbase course received FAA approval through a rare modification of standards process. The pavement design included 10 inches of P501 concrete and a 5-inch layer of cement-treated permeable base (CTPB) supported by the open-graded crushed aggregate subbase. Trierweiler Construction proposed a no-cost change order to eliminate the CTPB and increase the pavement thickness to 15 inches. The approved change benefited the project by increasing pavement section strength. A unique feature incorporated in the runway pavement joint layout is the center joint. The centerline joint is offset from the center crown line. CWA staff came up with the idea to mitigate snowplow damage to the center joint when the snowplows ride on the crown highpoint. Trierweiler fabricated a custom screed for the slipform paver to form the crown breakpoint in the slab. Special tools were made for finishing and checking the offset centerline joint. The Gould Peterson Municipal Airport consisted of an approximately 3,200-foot by 60-foot concrete runway with a displaced threshold. The existing pavement section consisted of 5 to 6 inches of concrete over 3 to 10 inches of asphalt. The existing concrete was approximately 25 years old and was deteriorating rapidly due to ASR, causing frequent foreign object debris on the runway. The City of Tarkio was awarded supplemental FAA funding in 2019 to cover 100% of the proposed project cost. Through a partnership with the Missouri Department of Transportation, the project was selected to proceed with design and construction. The new runway needed to be shifted south and elevated to solve existing obstructions with the adjacent MoDOT highway. The resulting runway is 3,600 feet by 75 feet and required the placement of a 3-foot fill at the new north end and a 6-foot fill at the new south end. The project also included replacing the airfield edge lighting, construction of new runway end identifier lights and precision approach path indicators, construction of a new electrical vault building and installing a new wind cone. The existing airport was closed in September 2020. To minimize potential earthwork overruns, the design consisted of a “crack and seat” of the existing runway pavement to provide a stabilized layer of existing pavement beneath the proposed fill. The project required the placement of approximately 130,000 cubic yards of fill, which was sourced off-site. Construction included the placement of approximately 37,500 square yards of P-209 crushed aggregate base. ldeker mobilized a concrete batch plant to the site and sourced specialized aggregate and Type IS cement to comply with the FAA P-501 specification requirements. A fully machine-controlled equipment setup was used to place approximately 36,500 square yards of 6-inch P-501 concrete. The runway paving consisted of four separate placements of 3,600 feet lengths. Due to cooperative efforts between the contractor and engineer, the project finished approximately 7.5% under the original budget. GOLD
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