ACPA Quarter 3 2018

Concrete Pavement Progress www.acpa.org 16 A L A B A M A R C C P R O J E C T the pavement as well as less maintenance costs added to the benefits of RCC for the interstate intersection. Speed of construction was also a concern. “We had to keep traffic flowing and RCC could be placed quicker than conventional concrete at the depth that was being used,” explains Couch. “The initial cost was a little higher but the RCC should give us 20 years of service versus 10 to 15 for asphalt.” The project included 3,640 linear ft of pavement with 1,580 linear ft of RCC used to pave from the end of the bridge to the on and off ramps on both sides. RCC pavement also extends to the truck stop driveway. Other work included repair and buildup of part of the asphalt road that leads up to the interchange and cast-in-place concrete work at the top of each ramp. Borings taken prior to design indicated a crushed stone base layer, says Couch. “We discovered that the degradation of the pavement led to water in the subgrade and no stone in some areas,” he says. In the areas that did not provide enough sup- port for the RCC pavement, the contractor, A.G. Peltz, an ACPA member, had to undercut and » continued from page 15