This is the latest in a line of concrete problems that have beset the Silver Line expansion project. More than three years ago, CRC found cracks in the line’s support girders near the Dulles International Airport. NBC 4 Washington reported earlier this year that 60 girders had displayed the cracks, some of which were up to 18 inches long and several inches wide, but the issue was resolved about a year after the cracks were discovered.
This year, CRC and the airports authority found 1,750 defective concrete panels used during station construction. CRC replaced 115 of the panels, which were manufactured by Universal Concrete Products at its factory in Pennsylvania.
