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ITíS useful stuff, concrete, but it does have drawbacks. One of the biggest is that it is not as weatherproof as the stone it often substitutes. Salt and ice routinely turn microscopic fractures in its fabric into gaping holes. These let water soak in. And that, in time, can cause the entire structure to fail. The upshot is that it concrete needs constant repair by teams of workmen assigned to fill in the newly formed gaps, which is tedious and expensive. So, all in all, it would be better if the stuff could heal such damage by itself.
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