“Results indicated complete healing of cracks in 21 days under optimal curing conditions.”
Concrete that heals itself is moving from laboratory to field trials across Europe. The technology embeds dormant Bacillus bacteria and calcium lactate inside the concrete. When water seeps into cracks, it activates the bacteria, which feed on the calcium lactate and produce limestone that fills the gaps. Recent tests show 25-40% strength improvements over conventional concrete. Remaining challenges include ensuring bacteria survive decades in harsh concrete environments and making the system work across varying temperatures and moisture conditions.