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Why Roman Concrete Endured Thousands of Years of Seawater Pounding, While Ours Can't - ExtremeTech: Roman concrete's durability and strength blows our own out of the water (in this case, literally). And after years of research, we're getting better at understanding why.
It seems that the sea water may dissolve components of the volcanic ash allowing more crystals of aluminous tobermorite to form.
'[A]ccording to University of Utah
geologist Marie Jackson, this kind of interlocking interaction is the
opposite of what modern material engineers would seek to create. “We’re
looking at a system that’s contrary to everything one would not want in
cement-based concrete,” she says. “We’re looking at a system that
thrives in open chemical exchange with seawater.”'
Source: www.extremetech.com
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