ACPA Quarter 3 2019

Concrete Pavement Progress www.acpa.org 20 (LBR) of 40. The LBR ratio test determine the materials bearing capacity or the amount of defor- mation amaterial experiences due to certain load, according the Florida Institute of Technology. Because one side of the new four-lane road was built on virgin ground adjacent to the existing road, it was completed first, leaving traffic on the old road, explains Yvonne Kur, Project Manager for Ajax. “We had 18 days of continuous paving on each side, completing about a half-mile each day,” she says. “After we completed the eastbound section, traffic was flipped to the new pavement and reconstructed the old roadway,” she says. Although the road is heavily traveled, it is located in a relatively isolated, rural area, so Ajax mobi- lized its own batch plant to manufacture all of the concrete for the job, says Kur. “Obtaining aggregate for the job was not a problem, but ce- ment and fly ash sourcing was challenging.” To ensure an adequate supply of material for every day, schedules were sent to suppliers weekly and additional storage units to hold the materials ahead of need were maintained. Kur adds they tried to avoid just-in-time deliveries in order to keep the plant running smoothly and without interruptions. The contractor and FDOT planned ahead for potential issues obtaining fly ash, says Kur. “We discussed alternate mixes if we were not able to obtain enough material to maintain 30% fly ash replacement in the PCC,” she says. “Having “We discussed alternate mixes if we were not able to obtain enough material to maintain 30% fly ash replacement in the PCC,” she says. “Having a plan B and C, along with different mixes that were pre- approved by FDOT, kept the project moving forward smoothly.” S R 7 1 0 O P P O R T U N I T Y I N F L O R I D A » continued from page 19