ACPA Concrete Pavement Progress Q2 2020

Concrete Pavement Progress www.acpa.org 20 with the pavement was not possible,” he says. “To overcome this issue, the contractor modi- fied a curb and gutter machine to allow for the curb and gutter to be placed after the lanes are paved—a process described as scabbing on the curb and gutter.” “Scabbing on the curb and gutter was a new process for us but it worked well,” says Tim- mons. “If we had not adapted to this process, our slipform paver’s track would have crushed the sand-encased duct bank,” he says, adding that if the pavement and curb had been placed monolithically, it would have added additional cost and caused further delays. “Scabbing the gutter was a new process for us, but it worked well,” says Timmons. Without modification, the slipform curb and gutter ma- chines could have damaged the duct bank, but the changes made it possible to pave without damaging utilities, he adds. The project was located in a busy commercial and retail area, as well as directly in front of a hospital. This required extra attention to traffic plans and signage that allowed access to buildings during construction. “All of the businesses and the hospital had secondary access on other streets, so signage directed traffic to those entries,” says Timmons. “We did have one realtor’s office that didnot have access, soweworkedwith an adjacent business to build a temporary ramp from their parking lot to the realtor’s property so the realtors could access their building from the parking lot.” In addition to the “scabbing” method, other innovative practices on the project included: 1. Colored concrete was used in non- conforming ADA locations to allow for slope transitions. 2. Radiused detectable warning panels were placed where needed and allowed for ramps to be uniquely laid out. 3. GPS equipment was used to finish grade the base course and was followed up by grade checks and bluetops [hubs added at the grade] as needed. This resulted in a consistent section and reduced concrete overrun by the contractor. In spite of weather delays and adjustments in constructionmethods to protect existing utilities, the project was completed on time and feedback has been excellent. Lanning says, “Not only is the road safer to travel with wider lanes, but the pedestrian walkways have been made much safer as well.” BROOKINGS ARTERIAL ROAD B R O O K I N G S A R T E R I A L R O A D » continued from page 18