ACPA Concrete Pavement Progress - Quarter 3, 2021

www.acpa.org Quarter 3, 2021 19 H E R C U L E S W A Y G E T S A N U P G R A D E Concrete, a local concrete plant, to produce the RCC, but we provided the twin shaft mixer that is needed to produce the harsher, dryer RCCmix,” he says. “This collaboration went well because King Asphalt wanted to learn how to work with RCC and already had the equipment needed to pave.” After paving was completed, Andale also handled the sawing and trowel-finishing of the pavement. The final pavement was 6 inches of RCC with a 6-ft. by 6-ft. panel size and a geotextile interlayer over the original 8 inches of concrete. The road has two 12-ft. driving lanes with 6-ft. shoulders on each side. Asphalt wedges were placed at the edges of the pavement to transition to the adja- cent areas since the new pavement was higher. Re-routed employees and deliveries were able to drive on the road quickly—cars after three days and trucks after seven days. “One of the lessons we learned during the project was the need to make sure our lines, which were laid over the fabric, did not shift even slightly,” says Amos. “One step we took was to use pins and stringline on the outside edge.” A trans- fer machine was used in front of the paver to avoid stops and starts in the paving operation, so some crewmembers stayed between the paver and transfer machine to constantly monitor the lines, he says. Overall, RCC as an overlay to existing pave- ment is a good tool for a contractor’s toolbox, says Munsick. “The flexural strength, speed of paving, and cost savings make it a good choice for many projects,” he says. “The technology is still evolving, and we are testing the use of steel fiber in 3-in. RCC for future projects.” Want to learn more about RCC? See related article on page 24.