
The Bacteria That Build Buildings: How a Concrete Pill That Heals Cracks Could Double the Life of Every Bridge in America
On a test platform at MIT's Civil and Environmental Engineering laboratory, a block of concrete has been sitting under a drip-feed of salt water for eight months. The block is cracked—intentionally, with a hydraulic press that opened a fissure half a millimeter wide and three centimeters deep. In ordinary concrete, that crack would be a death sentence. Water would seep in, reach the steel reinforcement bars inside, and begin the slow, inexorable process of rust that causes concrete to spall, crumble, and eventually fail. The bridge would need repair. The building would need reinforcement. The bill would arrive, eventually, in the millions.







