Roman recipe lasted 2,000 years thanks to strengthening reactions with seawater.
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References
Jackson, M. D. et al. American Mineralogist, in the press (2017).
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Tittelboom, K. V., Gruyaert, E., Rahier, H. & De Belie, N. Construction & Building Materials 37, 349-359 (2012).
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Witze, A. Rare mineral is the key to long-lasting ancient concrete. Nature (2017). https://doi.org/10.1038/nature.2017.22231
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DOI: https://doi.org/10.1038/nature.2017.22231