The healing agent, then, fills the crack through capillary action.

然后愈合剂通过毛细作用而充填裂纹。

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After filling the crack, the healing agent reacts with the catalyst which is embedded in the matrix polymer.

充填裂纹后，愈合剂与包埋在基体聚合物中的催化剂反应。

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Small fractures in the composites move through the material and rupture the microcapsules, releasing the healing agent.

复合体系中的小裂纹穿过材料并使微包覆物破坏，从而释放出愈合助剂。

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The bacterial food incorporated into the healing agent is calcium lactate - a component of milk.

BBC: Key test for re-healable concrete

The group infused a plastic-like polymer with microscopic capsules containing a liquid healing agent.

BBC: Time to heal: The materials that repair themselves

The main challenge is to ensure the healing agent is robust enough to survive the mixing process.

BBC: Key test for re-healable concrete