Stanford geophysicist Tiziana Vanorio has developed Phlego, a volcanic rock-based cement formula that could reduce carbon emissions by 67%.
Stanford geophysicist Tiziana Vanorio has developed Phlego, a volcanic rock -based cement formula that could reduce carbon emissions by 67%. It is inspired by the durable ancient Roman concrete and the resilient rock formations beneath Pozzuoli , Italy.
This innovation addresses the environmental impact of cement, which currently accounts for 8% of global greenhouse gas emissions.Vanorio developed a formula that replaces polluting limestone with volcanic rock. This new method mimics the strength of natural formations while cutting cement production’s carbon emissions.The researcher operates the rotary laboratory kiln to produce Phlego, an emissions-reducing cement formulation made from volcanic rock. Credit: R. HayNature’s “pre-cooked” solutionModern cement production relies on heating limestone to create clinker, but the process is both highly polluting and inefficient. When limestone is fired in fossil-fueled kilns, a chemical reaction splits the rock into lime and carbon dioxide, with this conversion alone accounting for nearly two-thirds of the industry’s emissions. Furthermore, the process wastes roughly half of the quarried rock’s mass, as it escapes into the atmosphere as gas rather than being incorporated into the final product.Vanorio’s breakthrough didn’t come from a computer model, but from structures like the Pantheon. Roman concrete, famous for lasting two millennia while modern bridges crumble in fifty years, relied on volcanic ash called pozzolan.The researcher spent a decade studying how nature creates these “naturally cemented” rocks deep underground. Using a specific igneous rock that naturally lost its carbon through ancient volcanic heat, she found a way to skip the most polluting stage of the production process.The result is Phlego. When Phlego is heated, it doesn’t belch CO2. Instead, it yields a high-performance material that mimics the fibrous, fracture-resistant microstructures found in the Italian crust. It is stronger, cleaner, and significantly more efficient.Closing the supply gapWhile many green tech solutions require companies to spend billions on new equipment, Phlego is designed to be broadly compatible with existing ones.“In hard-to-abate sectors like cement, the fastest path to revolutionary impact comes from compatibility rather than radical change,” Vanorio said. “A drop-in solution dramatically reduces deployment risk.”By working within existing kilns, the formula simultaneously tackles the carbon crisis by removing limestone from the equation and solves the supply gap by providing a reliable replacement for disappearing coal byproducts like fly ash. This compatibility ensures a faster, lower-risk path to large-scale decarbonization.The cement industry currently uses industrial byproducts like fly ash as supplementary materials to lower emissions, but these supplies are rapidly dwindling as coal plants phase out. Phlego addresses this shortage by providing a consistent, engineered alternative that serves as both a limestone substitute and a reliable additive. “Addressing the availability and consistency of supplementary cementitious materials will be critical for minimizing supply chain risks associated with producing low-carbon cement,” noted Vanorio.With support from the Stanford Sustainability Accelerator, the team is now scaling up. They have purchased their own industrial kiln and are hunting for entrepreneurs to help bring Phlego to the global market.For Vanorio, it is a full-circle moment. The rocks that once fascinated a child in Pozzuoli may soon become the literal foundation of the modern, green world.
Energy &Amp Environment Inventions And Machines Limestone Phelgo Pozzuoli Roman Concrete Volcanic Rock
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