Coal-fired power plants have been harmful for decades, but their byproduct, fly ash, offers potential environmental benefits. PHNX Materials has developed a method to purify fly ash, removing unwanted sulfur and aluminum to create a valuable concrete additive. This process not only helps concrete companies reduce carbon emissions but also produces new sources of sulfur and aluminum. While the closure of many coal plants has reduced available fly ash, companies like PHNX are innovating to maintain its use in construction, ensuring durability and longevity in infrastructure projects.
"Ash can be used to replace up a 30% of cement," Krish Mehta, co-founder and CEO of PHNX Materials, told TechCrunch. "This helps to eliminate a significant chunk of the material's carbon footprint."
"Fly ash helps to stabilize a concrete mix. In the absence of ash, a certain chemical reaction can turn the aggregate into a gel that can expand, cracking the concrete," Jorge Osio-Norgaard said.
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