科学素养与生活应用·英语30篇（1）

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自修复混凝土：细菌与乳酸钙如何悄然修补裂缝

Self-healing concrete contains dormant bacteria and a nutrient called calcium lactate.
When water enters a crack, the bacteria wake up and begin to metabolize the nutrient.
This metabolic process produces limestone, which gradually fills the crack over time.
Unlike traditional concrete, this material can repair itself without human intervention.
Scientists embed these microbes during mixing so they remain viable for decades.
The technique reduces maintenance costs and extends infrastructure lifespan significantly.
It works best in damp environments where moisture triggers bacterial activity.
Researchers are now testing it in bridges, tunnels, and underground parking structures.
Though still emerging, this bio-concrete is already used in several European pilot projects.
Its success depends on precise control of bacterial strain, nutrient dosage, and curing conditions.