"Move over, Superman! New method sees through concrete to detect early-stage corrosion." ScienceDaily. ScienceDaily, 26 April 2017. <www.sciencedaily.com / releases / 2017 / 04 / 170426153809.htm>.

“That’s a real problem,” he explained, “since the average age of the 400,000 steel-reinforced concrete bridges in the U.S. is 50 years, and there is no baseline data available for many of ...