With the news of crews working to fix Columbus Drive, which buckled Wednesday north of Roosevelt Road due to the heat, we wondered: How does that happen?
Robert Seyfried, a civil engineer who is an adjunct instructor at the Northwestern University Center for Public Safety, generally explains how a street can buckle.
Concrete expands in the heat. A concrete-paved road is constructed with heavy reinforcing or what’s known as expansion joints, he said. They are spaces in the pavement surface measured at a half an inch to an inch wide between sections of concrete and typically sealed and resealed periodically with tar, he said.