ACPA Concrete Pavement Progress Q2 2020

Concrete Pavement Progress www.acpa.org 18 continues on page 20 » accomplished where the existing utilities had a shallow bury depth.” This versatility proved to be beneficial in a few locations where the in place utilities unexpectedly changed in depth or diverted from the planning locates that were completed during the design phase, he adds. “We typically use 8- to 12-in. of PCC for an arte- rial road, but this design called for 8 inches of PCC pavement over 6 inches of a gravel base and a geotextile fabric because of the shallower than normal depth of the utilities,” says Brad Timmons, owner of Timmons Construction, an ACPA member. “The greatest challenge was the weather.” The project start was delayed with a snow event on April 11, 2019, and during the entire construc- tion phase, the team dealt with a record amount of rain. “We re-phased the project and started construction with the area that included the storm sewer system, then worked uphill from there,” says Timmons. “This change allowed us to complete the project on time.” An existing sand-encased, shallowduct bank also created some constructability challenges, says Petersen. “We knew the duct bank was behind the back of the proposed curb line on one side of the street for the entire length of the project but for one-third of the project, the utility was close enough and shallow enough to the curb that pouring the curb and gutter monolithically “An advantage to using the PCC pavement was that the depth was less than the asphalt option, which allowed for subgrade preparation and base course placement to be more easily accomplished where the existing utilities had a shallow bury depth.” B R O O K I N G S A R T E R I A L R O A D » continued from page 17