Scientists develop algae-based concrete that captures 142% more carbon

Researchers at the University of Pennsylvania have developed an innovative algae-based concrete that significantly reduces environmental impact while maintaining structural integrity. By incorporating diatomaceous earth—powder made from fossilized silica shells of microscopic algae—into a 3D-printed concrete mix, the team created a lightweight material that uses 68% less cement and absorbs 142% more CO₂ compared to traditional concrete. This breakthrough leverages the natural carbon-trapping abilities of diatoms and a mathematically optimized internal geometry inspired by coral reefs and sea stars, known as triply periodic minimal surfaces (TPMS), which maximize surface area and stiffness with minimal material. The new concrete not only captures more carbon dioxide but also grows stronger over time during curing, retaining 90% of the strength of conventional solid concrete blocks despite its high porosity. The design incorporates post-tensioning cables and advanced force-balancing geometries to ensure durability and buildability at architectural scales. The researchers are currently scaling up the technology for larger applications such