The Silver Spring Transit Center, a much-anticipated and much-delayed transportation project in Montgomery County, will not be opened for at least a couple more months, a county official said Monday.

The $112 million transit hub has been under construction since 2008, a project two years behind schedule. In January, the county alleged that construction workers improperly poured concrete on two floors. Foulger-Pratt, the contractor in charge of construction, said the building is nonetheless structurally sound.

County officials had hoped to open the transit center in January, but the concrete issues have postponed the opening date indefinitely. A third-party company, KCE Structural Engineers, is studying the concrete and will issue recommendations to fix the problem within the next couple of months, said David Dise, the county official who oversees the project.

According to the county Web site, the transit hub is 97 percent complete, but Dise said it will open only after the problem is fixed. Dise is scheduled to update Silver Spring residents and business owners at a Silver Spring Citizens Advisory Board meeting at 7 p.m. Monday.