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[–] derram 0 points 7 points (+7|-0) ago | :

Why Roman concrete still stands strong while modern version decays | Science | The Guardian

'Jackson has previously argued Roman concrete should be used to build the seawall for the Swansea lagoon.“There’s many applications but further work is needed to create those mixes. '

'These minerals, say the authors, helped to reinforce the concrete, preventing cracks from growing, with structures becoming stronger over time as the minerals grew. '

'Writing in the journal American Mineralogist, Jackson and colleagues describe how they analysed concrete cores from Roman piers, breakwaters and harbours. '

'The Roman recipe – a mix of volcanic ash, lime (calcium oxide), seawater and lumps of volcanic rock – held together piers, breakwaters and harbours. '

'By contrast, modern concrete, based on Portland cement, is not supposed to change after it hardens – meaning any reactions with the material cause damage. '

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