Concrete is not as strong of a building material as we thought
Fast Company - 10/21/2014
Some of our favorite building materials are also the most vulnerable. Think of glass–floor-to-ceiling windows are awesome, until they fall 18 stories onto the street. But we typically think of concrete as solid. Concrete structures from ancient Rome, like the Pantheon and the Colosseum, are still standing almost 2,000 years later.
However, a new study by civil engineers at Northeastern University finds that as a building material, the longevity of modern concrete–which unlike the ancient Roman building material, is typically reinforced with steel rebar–may not be all it’s cracked up to be.