Chemical Grouting, Horizontal Tensioning, and Concrete Repair at Chickamauga Lock
Pennoni was awarded the lock project under a U.S. Army Corps of Engineers, Nashville District multi-year contract. The scope of work involved the installation of 36 horizontal post-tensioned bar anchors inside the Chickamauga Lock chamber, and performing chemical grouting to seal existing cracks in the lock concrete, which involved drilling injection points and injecting a polyurethane grout. Additional work included the removal of the deteriorated concrete surface at Monolith Block 41 to a depth of six inches and replacing it with reinforced concrete. The concrete of the original lock had deteriorated due to "concrete growth" caused by chemical reactions between its constituent cement and rock aggregate. The project was completed in August 2010, with a cost of $800K.