The ancient Romans were master builders and engineers, perhaps most famously represented by the still-functional aqueducts.
And those architectural marvels rely on a unique construction material: pozzolanic concrete, a spectacularly durable material that gave Roman structures their incredible strength.
The properties of this concrete have generally been attributed to its ingredients: pozzolana, a mix of volcanic ash – named after the Italian city of Pozzuoli, where a significant deposit of it can be found – andBut that, as it turns out, is not the whole story. An international team of researchers led by the Massachusetts Institute of Technology found that not only are the materials slightly different from what we may have thought, but the techniques used to mix them were also different.
"The idea that the presence of these lime clasts was simply attributed to low quality control always bothered me,""If the Romans put so much effort into making an outstanding construction material, following all of the detailed recipes that had been optimized over the course of many centuries, why would they put so little effort into ensuring the production of a well-mixed final product? There has to be more to this story.
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