Faulty concrete found in massive condo community in Boston suburbs...worst ever seen

[BlueWaveNeverEnd]

7. "Pyrrhotite is an iron sulfide mineral that can be found in concrete aggregates, such as sand, gravel, or stone, and can

Pyrrhotite is an iron sulfide mineral that can be found in concrete aggregates, such as sand, gravel, or stone, and can cause concrete to crack and crumble. When exposed to water and oxygen, pyrrhotite breaks down and expands, creating secondary minerals that can weaken concrete's structural integrity and lead to failure. This process can occur naturally after 15–20 years.

CT.gov