PHNX Materials found a way to decarbonize concrete using dirty coal waste

Coal-fired power plants have done their fair share of damage over the past century. From climate change to acid rain, black lung to heart disease, they’ve generally been on the debit side of the ledger. 

But lurking in the literal ashes is something of a minor climate savior.

“Ash can be used to replace up to 30% of cement,” Krish Mehta, co-founder and CEO of PHNX Materials, told TechCrunch. By displacing cement in concrete, fly ash from coal plants can eliminate a significant chunk of the material’s carbon footprint.

PHNX…