b'46 BNA RUNWAYSoff-site materials can be up to four times therepairs throughout the years, but complete replacement became cost. The savings are pretty significant any timethe only option when its Pavement Condition Index (PCI) dropped you can use materials in place.from 70 to 54.Personnel from Garver, the engineering,The poor rating didnt mean the runway was unsafe, Holton planning, architectural and environmentalspecifies, but it showed it was time for reconstruction.services firm that lead the project, areWhen the airport issued a request for qualifications, Sisemore similarly enthusiastic about the recyclingknew he wanted to win the work. It was an interesting job, and a method. Ryan Sisemore, vice president forRYAN SISEMORE huge opportunity for sustainable construction, he explains. Garver, stresses that the 50,000 cubic yards of processed material left over from the runway project will saveGarver had previously completed dozens of projects at BNA, BNA money in the future.but Sisemore was particularly drawn to this one because the original runway was built on a former rock quarrya 350-foot-We flipped the script, he remarks. We went from looking atdeep depression that had required substantial fill. The fill had concrete removal as a liability, to viewing it as an asset. Before, we would have hauled the material away for disposal. Instead, itsGrowing slowly settled over the years, requiring crews to pressure grout and replace entire concrete slabs to restore the runways profile.in a stockpile to use in future projects, saving future dollars. with trusted With deep fill, theres always slow settlement that occurs, According to Sisemore, the price for virgin crushed aggregate base averages $45 a ton, but the airports cost for recycledpartnersSisemore explains. They had to fix the runway a couple times to lift it up. We knew going in that we would need a solid structural concrete aggregate came in at $13.50 a ton.plan for runway replacement. Garver knows dedication goes beyond the runway. Its Earlier, BNA had also converted the remaining rock quarry lake, Pavement in Need about growing with trusted which sits next to the runway, into a vast geothermal cooling Runway 2R-20L was constructed in 1989 and reached the end ofpartners like Nashville system. Submerged lakes plates cool water, which makes a its useful life in 2018. It had received multiple rehabs and isolatedInternational Airport to help continuous lo muniti and from a terminals central utility plant. The our com op toes take flight. Ryan Sisemore, PE GarverUSA.comEast Region Aviation LeaderMay | June 2022AirportImprovement.com'