[SunkenCiv]

• The Surprisingly Plausible Theory that the Pyramids were Poured from Ancient Concrete [10/03/2021]

[thesearethetimes...]

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[rdl6989]

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[PIF]

Why was Roman Concrete Forgotten during the Middle Ages?

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For most of the same reason that most of what preceded it was forgotten and had to be re-invented like optical lens and large ship construction. Muslims.

[bunkerhill7]

Concrete became abstract during the Middle Ages.

[waterhill]

Some guy named Brandon said it was unsustainable and they believed him....

[pierrem15]

No monumental building after the beginning of the 4th Century. Even Hagia Sophis was built of brick, although the harbor built by Justinian may have used Roman concrete because it set in water.

In Britain, knowledge of building in stone completely disappeared. French stonemasons had to be imported to build the first stone Anglo-Saxon churches.

Roman concrete is really remarkable because it achieves a tensile strength equal to reinforced modern concrete without the Achilles heel of rusting rebar. It's also self-healing, meaning cracks exposed to water generate new crystals that seal the crack and re-bind the two halves.

It is very labor intensive, because it's too thick to pour. It's a thick paste that has to be rammed into the form.

[CodeToad]

Liberalism?

[butlerweave]

They also forgot how to Wash during the Middle Ages

[Flick Lives]

Never mind the forgotten concrete. how did people forget about indoor plumbing, flush toilets, and baths during the Middle Ages?

[doorgunner69]

Liberals were elected?

[Right_Wing_Madman]

Why was Roman Concrete Forgotten during the Middle Ages?

Before the British Empire, the Roman Empire was the most advanced civilization in history, particularly in the fields of medicine and engineering. The Roman Empire was right on the edge of the industrial revolution, but didn't quite make it. In the middle of the second century the Romans invented prototypes of the first steam engine but did not figure out how to apply them in a factory, locomotive, or ship. Roman aversion to labor-saving devices is probably what held them back. After the breakup of the empire in the third century, it would take 1500 years for civilization to rediscover techniques and technology the Romans used.

[SpaceBar]

Christian navel gazing, internecine conflicts all over Europe in the vacuum left by the Romans, several waves of plague, and the fact that concrete isn’t a substance, it’s a whole technology that requires a variety of trained people, made it difficult to reproduce what the Romans did.

[rlmorel]

That video was interesting...thanks for posting it.

[GreenHornet]

For centuries, concrete was everywhere in Roman Italy

That's because the guys from Sicily had all of the cement contracts.

[Bigg Red]

Mark

[epluribus_2]

Domus Depot stores all closed?

[Paladin2]

SALT LAKE CITY, UTAH—Modern concrete, when placed in the presence of sea water, erodes over time. According to a report in BBC News, scientists led by Marie Jackson of the University of Utah examined samples of ancient Roman concrete from ancient harbor structures with an electron microscope, X-ray micro-diffraction, and Raman spectroscopy in an effort to learn why it gained strength from exposure to sea water. The tests, conducted at the Lawrence Berkeley National Laboratory, revealed crystals of a rare mineral known as aluminum tobermorite growing throughout the samples of concrete, in addition to a porous mineral called phillipsite. The mineral crystals continued to grow in the Roman mix of volcanic ash and lime, which reinforced the concrete over long-term exposure to sea water. A similar chemical reaction has been detected in underwater volcanoes. “Their technique was based on building very massive structures that are really quite environmentally sustainable and very long-lasting,” Jackson said. To read in-depth about how Romans used concrete, go to “Rome’s Lost Aqueduct.”

https://web.uvic.ca/~jpoleson/ROMACONS/Caesarea2005.htm

https://www.archaeology.org/news/5710-170705-roman-ocean-concrete

[Sequoyah101]

It was causing globull warming and they banned it and used mud blocks instead because they were sustainable and renewable.