{"id":341637,"date":"2025-12-13T07:36:11","date_gmt":"2025-12-13T07:36:11","guid":{"rendered":"https:\/\/peraltafinancing.com\/aerospace\/this-ancient-construction-site-in-the-ruins-of-pompeii-is-revealing-new-secrets-about-the-2000-year-old-recipe-for-roman-concrete\/"},"modified":"2025-12-13T07:36:11","modified_gmt":"2025-12-13T07:36:11","slug":"this-ancient-construction-site-in-the-ruins-of-pompeii-is-revealing-new-secrets-about-the-2000-year-old-recipe-for-roman-concrete","status":"publish","type":"post","link":"https:\/\/fivemor.com\/?p=341637","title":{"rendered":"This Ancient Construction Site in the Ruins of Pompeii Is Revealing New Secrets About the 2,000-Year-Old Recipe for Roman Concrete"},"content":{"rendered":"


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New research suggests the Romans used a method known as \u201chot mixing\u201d to produce self-healing concrete, which allowed them to build structures that endured for centuries<\/h2>\n
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Sarah Kuta<\/a><\/p>\n

– Daily Correspondent<\/span><\/p>\n

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The researchers based their conclusions on an intact ancient construction site found at Pompeii.
\n Silvia Bazzicalupo \/ Anadolu Agency via Getty Images<\/span>
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Travel throughout much of Europe today and you\u2019ll find traces of the Roman Empire everywhere.\u00a0Amphitheaters<\/a>,\u00a0aqueducts<\/a>,\u00a0walls<\/a>, bridges,\u00a0forts<\/a> and other structures built centuries ago are still standing, thanks in large part to the ancient Romans\u2019 use of sturdy concrete.<\/p>\n

For years, researchers have puzzled over the specific ingredients and techniques the Romans used to make their concrete. In 2023, a team\u00a0proposed<\/a> one possible explanation: They used a \u201chot-mixing\u201d technique to produce self-healing concrete, which could repair cracks on its own.<\/p>\n

Now, researchers say they\u2019ve confirmed that earlier hunch. They share their latest conclusions in a new paper published December 9 in the journal\u00a0Nature Communications<\/em><\/a>.<\/p>\n

For the study, scientists took samples from an intact ancient construction site discovered at\u00a0Pompeii<\/a>, the ancient Roman city preserved by the eruption of Mount Vesuvius in 79 C.E. A comparison of materials from finished walls, in-progress walls and nearby piles of dry, raw material at the site \u201cunequivocally\u201d support the hot-mixing theory, the researchers write in the paper.<\/p>\n

\u201cUnlike finished structures that have undergone centuries of repair or weathering, this site captures construction processes as they happened,\u201d study co-author\u00a0Admir Masic<\/a>, an engineer at the Massachusetts Institute of Technology, tells\u00a0Reuters<\/a>\u2019 Will Dunham. \u201cFor studying ancient technologies, there is simply no parallel. Its exceptional preservation offers a true \u2018snapshot\u2019 of Roman building practice in action.\u201d<\/p>\n

The Romans\u2019 hot-mixing method entailed blending volcanic ash and other dry ingredients with \u201cquicklime,\u201d a form of highly reactive, dry limestone. Adding water set off a chain reaction that produced heat\u2014hence the name. The resulting mixture was full of chunks of calcium that gave the concrete its self-healing properties: As water trickles into cracked or damaged Roman concrete, it encounters and dissolves the calcium. When those deposits later recrystallize or react with other materials, they help fill in the cracks.<\/p>\n

At one point, while analyzing ancient Roman concrete, researchers wondered whether the calcium deposits\u2014known as lime clasts\u2014were simply the result of sloppy mixing. But that explanation never sat well with Masic, who told\u00a0CNN<\/a>\u2019s Katie Hunt in 2023 it was \u201creally difficult to believe that ancient Roman [engineers] would not do a good job, because they really made careful effort when choosing and processing materials.\u201d Now, as seen through the lens of hot mixing, the calcium deposits\u2019 presence makes sense.<\/p>\n

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The ancient Romans made self-healing concrete by mixing ingredients in a specific way.<\/p>\n

Vaserman et al. \/ Nature Communications, 2025<\/span><\/p>\n<\/figcaption><\/figure>\n

The new discoveries contradict the concrete manufacturing process described in historic texts\u2014specifically, an influential treatise called De Architectura<\/em> written by famed Roman architect and engineer Vitruvius in the first century B.C.E.<\/p>\n

Since they have \u201ca lot of respect for Vitruvius,\u201d it was difficult for the researchers to \u201csuggest that his description may be inaccurate,\u201d Masic says in a\u00a0statement<\/a>. However, the results from the research at Pompeii suggest Vitruvius\u2019 writings were wrong\u2014or, perhaps, \u201cmisinterpreted,\u201d according to the statement.<\/p>\n

It\u2019s also possible that Vitruvius was simply describing an earlier method and that concrete manufacturing evolved as time went on. \u201cA good analogy could be the early telephones,\u201d Masic tells Reuters. \u201cIn the 1920s-30s: rotary dialing, long-distance copper lines. In the 2020s: smartphones using packet-switched digital signals and wireless networks.\u201d<\/p>\n

Looking ahead, the findings could help improve modern construction techniques, informing the development of next-generation durable, low-carbon concrete. Additionally, they could have implications for modern restoration practices\u2014especially those used on ancient Roman buildings\u2014ensuring that repairs are both \u201chistorically authentic and structurally sound,\u201d the researchers write in the paper.<\/p>\n

\u201cThis material can heal itself over thousands of years, it is reactive and it is highly dynamic,\u201d Masic says in the statement. \u201cIt has survived earthquakes and volcanoes. It has endured under the sea and survived degradation from the elements. We don\u2019t want to completely copy Roman concrete today. We just want to translate a few sentences from this book of knowledge into our modern construction practices.\u201d<\/p>\n

Meanwhile, the new paper is garnering praise from outside experts\u2014including\u00a0Tom Brughmans<\/a>, an archaeologist at Aarhus University in Denmark, who describes it as \u201csimply a beautiful observation, an archaeologist\u2019s dream.\u201d<\/p>\n

\u201cFew topics in Roman archaeology are more worth our attention than the development of concrete,\u201d Brughmans, who was not involved with the research, tells\u00a0Scientific American<\/em><\/a>\u2019s Humberto Basilio.<\/p>\n

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