Suche
Beiträge, die mit buildings getaggt sind
Trump doesn’t want ‘to hurt Ireland’ — but he might
Ireland’s visiting prime minister endures an excruciating 45 minutes in Trump’s live-TV star chamber as the U.S. leader swings at Brussels, not Dublin.Shawn Pogatchnik (POLITICO)
Israel warns of ‘military option’ against Iran as Netanyahu embraces Trump – POLITICO - EUROPE SAYS
'We voted with the Americans and I do believe that Russia is the aggressor,' he said. 'We haven'tEUROPE SAYS (EUROPESAYS.COM)
Israel warns of ‘military option’ against Iran as Netanyahu embraces Trump – POLITICO
'We voted with the Americans and I do believe that Russia is the aggressor,' he said. 'We haven't changed our mind, but we thought it is right to give a chance to the initiative of America to try to end this war and solve it by peaceful means.BYTESEU (Bytes Europe)
Anti-EU protesters storm EU mission in Bulgaria – POLITICO
Thousands of supporters of Bulgaria’s far-right Revival party tried to break into the headquarters of the European Union mission in Sofia during a protest against the country’s plans to adopt the euro in 2026.BYTESEU (Bytes Europe)
Ex-Polish justice minister ducks police, avoids Pegasus probe
Zbigniew Ziobro evaded officers and spoke of “political theatrics.”Wojciech Kość (POLITICO)
An unusual pair of semi-detached houses in an older part of my town, with separate roofs. I liked the mirror-image windows, contrasting decor, and evidence of historic subsidence.
Gaza cease-fire to begin Sunday morning
The deal marks the first pause in hostilities in the 15-month war.Giovanna Coi (POLITICO)
Who is Peter Mandelson, Britain’s ‘prince of darkness’ US ambassador pick?
He’s an anti-Brexit advocate for closer China ties — but could Peter Mandelson charm Trumpworld?Emilio Casalicchio (POLITICO)
Romanian pro-EU parties unite to crowd out far-right candidate Georgescu – POLITICO
The coalition means that the four parties, along with the ethnic minority representatives, will together hold a majority in parliament and will be able to push for a prime minister from among their ranks.BYTESEU (Bytes Europe)
Romanian pro-EU parties unite to crowd out far-right candidate Georgescu – POLITICO - EUROPE SAYS
The coalition means that the four parties, and the ethnic minority representatives, will together hold a majority inEUROPE SAYS (EUROPESAYS.COM)
Romanian pro-EU parties unite to crowd out far-right candidate Georgescu
Social Democrat Prime Minister Marcel Ciolacu threw his support behind reformist Elena Lasconi for president.Carmen Paun (POLITICO)
January 20th, 2023
"Rome may not have been built in a day, but it was built to last — or at least its concrete was, given that the pieces of the Roman Empire that have stood to our time, in one form or another, tend to have been built with it. That material has proven not just durable but enduringly fascinating, holding a great deal of not just historical interest but technical interest as well. For ancient Roman concrete appears to outlast its much more technically advanced modern descendants, and the complex question of why is one we’ve featured more than once here on Open Culture. Just this year, researchers at MIT, Harvard, and laboratories in Italy and Switzerland have found what seems to be the final piece of the puzzle.
"'For many years, researchers have assumed that the key to the ancient concrete’s durability was based on one ingredient: pozzolanic material such as volcanic ash from the area of Pozzuoli, on the Bay of Naples,' writes MIT News’ David L. Chandler. 'Under closer examination, these ancient samples also contain small, distinctive, millimeter-scale bright white mineral features.'
"Previously assumed to be nothing but imperfections in the process or the materials, these 'lime clasts,' in light of this most recent research, constitute evidence of 'hot mixing,' which involves heating to a high temperature ingredients including quicklime (or calcium oxide), a purer and more reactive form of lime.
"Undergoing hot mixing, 'the lime clasts develop a characteristically brittle nanoparticulate architecture, creating an easily fractured and reactive calcium source' that 'could provide a critical self-healing functionality.' In practice, this means that 'as soon as tiny cracks start to form within the concrete, they can preferentially travel through the high-surface-area lime clasts. This material can then react with water, creating a calcium-saturated solution, which can recrystallize as calcium carbonate and quickly fill the crack, or react with pozzolanic materials to further strengthen the composite material.' Here we have a convincing explanation of the reactions that, in ancient Roman concrete, 'automatically heal the cracks before they spread.'
"No such self-healing happens in modern concrete, the production of which has not involved quicklime for a very long time indeed — but perhaps it could once more. During their research process, writes Dezeen’s Rima Sabina Aouf, the team 'produced samples of hot-mixed concrete using both ancient and modern formulations, cracked them, and ran water through the cracks. Within two weeks, the cracks had healed and water could no longer flow through, while identical concrete blocks made without quicklime never healed.' Such findings 'could help increase the lifespan of modern concrete and therefore mitigate the notorious environmental impact of the material,' and the researchers 'are now working to commercialize their more durable concrete formula.' Even in the twenty-first century, the building industry could well benefit by doing as the Romans did."
https://www.openculture.com/2023/01/the-mystery-finally-solved-why-has-roman-concrete-been-so-durable.html
#AncientTechnology #Buildings #Architecture #SolarPunk
The Mystery Finally Solved: Why Has Roman Concrete Been So Durable?
Image by Benjaminec, via Wikimedia Commons Rome may not have been built in a day, but it was built to last — or at least its concrete was, given that the pieces of the Roman Empire that have stood to our time, in one form or another, tend to have be…Colin Marshall (Openculture.com)
Israeli airstrike kills 11 in central Beirut
Lebanese officials said no senior Hezbollah figure died in the bombing.Gregorio Sorgi (POLITICO)
US military base in Poland is ‘priority target,’ Russia warns
War of words escalates between Moscow and the West.Scout Hudson (POLITICO)
New Russian church raises suspicions in Swedish town
It’s feared Russia could use the church as cover for future intelligence or sabotage operations.Charlie Duxbury (POLITICO)
Ranting Trump loses his way as Harris backers dare to hope
Republican ex-president rambles about Al Capone while final polls give vice president a late boost.Tim Ross (POLITICO)
How to watch the commissioner hearings like a pro
Your step-by-step guide to the European election’s season finale.Max Griera (POLITICO)