The roof of the sludge concentration building at Chicago's Calumet Water Reclamation Plant collapsed at around 11 a.m. August 30. Ten people were hurt and successfully evacuated to area hospitals for treatment by the Chicago Fire Dept.
The cross-border Keystone XL pipeline was hit with another setback on Aug. 15 when a U.S. District Court judge in Montana ordered the U.S. State Dept. to perform a supplemental environmental impact statement on a new route through Nebraska.
U.S. Army Corp. of Engineers' researchers, leading a team that recently completed the 3D printing of 9.5-ft-tall reinforced concrete walls for a 32-ft x 16-ft deployable barracks, are setting their sights on a future project--3D printing of concrete roof beams--even before they have put the precast concrete lid on the printed walls.