Researcher Paulo Monteiro of the Lawrence Berkeley National Laboratory may have discovered the key to more sustainable concrete in samples of "sea" concrete found in a Mediterranean breakwater built by ancient Romans. Monteiro found that the sea concrete contained calcium-aluminum-silicate-hydrate, an "extraordinarily stable compound," as well as aluminum tobermorite, a rare mineral, which made the concrete emit "less greenhouse gas pollution, since it can be made at lower temperatures and hence less fossil fuel than modern Portland cement." However, it takes longer for the Roman type of concrete to cure.

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