Trenchless Technology

SEP 2018

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I N 2016, Hurricane Matthew left a path of de- struction in its wake up the East Coast. North Carolina was hard hit by storm- related looding. Waters continued to rise in the days after the storm as lood waters receded elsewhere, draining to lower points. That included Lumber- ton, North Carolina, located 70 miles southeast of Wilmington, in the coastal plains region of the state. Approximately six miles north of Lumberton , there is a triple barrel box culvert under I-95. Each barrel is 12 ft x 12 ft , so essentially there is a 36-ft wide culvert under the high- way. Storm-related looding caused a major washout underneath the inlet end, leaving a huge void, threaten- ing the culvert 's integrity. That , in turn, would lead to a compromised highway in the long run. The North Carolina Department of Transporta- tion (NCDOT) completely shut down I-95 there for a time due to looding . When lood waters receded, just one lane opened; the lane above the void remained closed. Finding a Solution NCDOT tried illing the void in- house with cementitious grout over a weekend, which was not successful. That Monday, NCDOT oficials hired, Applied Polymerics, of Mt. Airy, North Carolina, to solve the problem. The contractor opted to ill the void with Prime Flex 985 LX20 Fast, a highly ex- pansive two-component polyurethane. The Fast formulation reacts in 12 sec- onds vs. 68 to 70 seconds and reaches full rise at 65 to 85 seconds. " We needed to use LX20 Fast be- cause we needed it to set up quickly, otherwise the water current would have just washed it away," said Scott Kammerer, director of Applied Poly- merics' Infrastructure Division. " We like 985 because of its structural ca- pabilities." Applied Polymerics lived up to its promise: " Whatever It Takes." That eve- ning one of its crews picked up mate- rial from Prime Resins, which was just east of Atlanta, Georgia, and started work on Tuesday morning with a sec- ond crew. Complicating Factor The lood level of the water created a nearly impossible work site, essen- tially an underwater grouting job. To W W W.T R E N C H L E S S T EC H N O LO GY.C O M 45 How Two Culverts Benefited from Polyurethane Grouting

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