Engineered Biopolymer Composite: A near structural-grade, carbon-negative cement alternative

Stanford University's Lepech Research Group has developed an Engineered Biopolymer Composite (EBC): a recyclable, carbon-negative alternative to lightweight concrete and non-structural masonry, made by binding soil aggregate with lignin (a hydrophobic biopolymer) and a plant-based additive. Building on prior research (Stanford docket 23-551), the plant-based additive enhances the biopolymer's binding capability, significantly increasing the strength of this three-phase composite. Compaction during desiccation further improves strength by reducing shrinkage cracks and flaw size, making EBC up to 400% stronger than comparable composites. Sourced from low-cost, carbon-rich waste feedstocks, EBC is cement-free and carbon-negative overall. Ongoing optimization of additives, compaction, and solvent chemistry offers a roadmap toward semi-structural and structural-grade performance as a carbon-negative alternative to Portland cement.

Stage of Development – Prototype
The Lepech Research Group have produced standard clay-fired size bricks that meet strength requirements for certain construction applications as defined by ASTM standards.