Hello! You can call me Ryn. I don't really post a whole lot, but I reblog things sometimes. This will likely turn into a clusterfuck like all my other social media. My profile picture was drawn by my good friend Maddie! @electriclord
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Captainlavellan - Captain-Lavellan - Tumblr Blog
Mystery of why Roman buildings have survived so long has been unraveled, scientists say (Katie Hunt, CNN, Jan 06 2023)
“Roman concrete, in many cases, has proven to be longer-lasting than its modern equivalent, which can deteriorate within decades.
Now, scientists behind a new study say they have uncovered the mystery ingredient that allowed the Romans to make their construction material so durable and build elaborate structures in challenging places such as docks, sewers and earthquake zones.
The study team, including researchers from the United States, Italy and Switzerland, analyzed 2,000-year-old concrete samples that were taken from a city wall at the archaeological site of Privernum, in central Italy, and are similar in composition to other concrete found throughout the Roman Empire.
They found that white chunks in the concrete, referred to as lime clasts, gave the concrete the ability to heal cracks that formed over time.
The white chunks previously had been overlooked as evidence of sloppy mixing or poor-quality raw material.
“For me, it was really difficult to believe that ancient Roman (engineers) would not do a good job because they really made careful effort when choosing and processing materials,” said study author Admir Masic, an associate professor of civil and environmental engineering at the Massachusetts Institute of Technology. (…)
Additional analysis of the concrete showed that the lime clasts formed at extreme temperatures expected from the use of quicklime, and “hot mixing” was key to the concrete’s durable nature.
“The benefits of hot mixing are twofold,” Masic said in a news release.
“First, when the overall concrete is heated to high temperatures, it allows chemistries that are not possible if you only used slaked lime, producing high-temperature-associated compounds that would not otherwise form.
Second, this increased temperature significantly reduces curing and setting times since all the reactions are accelerated, allowing for much faster construction.”
To investigate whether the lime clasts were responsible for Roman concrete’s apparent ability to repair itself, the team conducted an experiment.
They made two samples of concrete, one following Roman formulations and the other made to modern standards, and deliberately cracked them.
After two weeks, water could not flow through the concrete made with a Roman recipe, whereas it passed right through the chunk of concrete made without quicklime.
Their findings suggest that the lime clasts can dissolve into cracks and recrystallize after exposure to water, healing cracks created by weathering before they spread.
The researchers said this self-healing potential could pave the way to producing more long-lasting, and thus more sustainable, modern concrete.
Such a move would reduce concrete’s carbon footprint, which accounts for up to 8% of global greenhouse gas emissions, according to the study.
For many years, researchers had thought that volcanic ash from the area of Pozzuoli, on the Bay of Naples, was what made Roman concrete so strong.
This kind of ash was transported across the vast Roman empire to be used in construction, and was described as a key ingredient for concrete in accounts by architects and historians at the time.
Masic said that both components are important, but lime was overlooked in the past.”
Want to learn something new in 2022??
Absolute beginner adult ballet series (fabulous beginning teacher)
40 piano lessons for beginners (some of the best explanations for piano I’ve ever seen)
Excellent basic crochet video series
Basic knitting (probably the best how to knit video out there)
Pre-Free Figure Skate Levels A-D guides and practice activities (each video builds up with exercises to the actual moves!)
How to draw character faces video (very funny, surprisingly instructive?)
Another drawing character faces video
Literally my favorite art pose hack
Tutorial of how to make a whole ass Stardew Valley esque farming game in Gamemaker Studios 2??
Introduction to flying small aircrafts
French/Dutch/Fishtail braiding
Playing the guitar for beginners (well paced and excellent instructor)
Playing the violin for beginners (really good practical tips mixed in)
Color theory in digital art (not of the children’s hospital variety)
Retake classes you hated but now there’s zero stakes:
Calculus 1 (full semester class)
Learn basic statistics (free textbook)
Introduction to college physics (free textbook)
Introduction to accounting (free textbook)
Learn a language:
Ancient Greek
Latin
Spanish
German
Japanese (grammar guide) (for dummies)
French
Russian (pretty good cyrillic guide!)
Tell me you don’t know where the clitoris is without telling me you don’t know where the clitoris is.
Reblog if you are a “female pleasurist”
u have been visited by the yule egg
if you reblog this all ur dreams will come true inside ur dreams. if you do not reblog this within a week ur friend will turn into a demon.
it’s true! i didn’t believe it and my friend Desiré turned into a desire demon. she’s a lot more fun 2 hang out with now but don’t let this happen 2 u
Embroidering Dorian’s character card!
So… in terms of Suzanne neglecting her family, I think that her husband and kids have a right to feel upset by this. On the flip side though, the dad fucked around and ignored all of them too. He was trying to solve a financial crisis that he only ONCE mentioned to his wife. Like… babe. Some communication please??
So, while I think they have a right to be upset and feel neglected/upset they were put into a very dangerous situation… they DO KNOW Mae would have been burnt alive if Suzanne hadn’t gone to get her? That a 16 year old girl would have been actually lit on fire and died? Idk man. The show makes it seem like had Suzanne just left her to stay with the cult the family would have been happy and whole or whatever. But… how on earth can you live with yourself after that??
The existence of cheese is proof that God loves us and wants us to be happy
Hello hello! I’m late to getting to this post this year but better late than never.
As has become tradition for me these last few years, I’m gonna gift away some art for Pride. So three of y’all will get to commission (a fully paid by yours truly) OTP from @neonravensart.
Rules and other important stuff below.
You don’t have to follow me, it can be a pairing from any fandom (we don’t need to share a fandom). Simply reblog or like this post and comment on it or in my asks or DMs with the pairing of your choice AND why you love them. It can be your own favorites (fandom or OCs) and/or someone else’s favorites, the more the merrier. You can request as many or as few relationships as ya want. Each relationship counts as one entry.
I’ll draw three winners on June 18th at 9:00 am CST. The three winners will receive a fullbody couple simple commission from the artist.
Please note that the artists’ commission policies and rules apply when the time comes and all I ask is that you be respectful to everyone participating and that your pairing is in keeping with the giftaway since I’m offering this to highlight all of the beautiful forms of love that are worth celebrating.
🏳️🌈Happy Pride🏳️🌈
You find a girl crying next to a grave. “What’s wrong?” You ask. She cries harder. “Nobody came to my funeral.”
Warden Caine has Anemone’s whole heart 💙
Go play the Night Market IF. It’s my friends wip and it’s AMAZIN 💖🌹💖
So the YouTuber illuminaughtii has done some excellent videos on how shady af Autism $peaks and Next for Autism are, the problem of AFAB autistics experience (still), the controversy over Sesame Street, the dangers of MMS (bleach therapy) and a three part series on Wakefield.
Blair does thorough research on all her videos and provides links to everything in the descriptions. She loves ASAN (will never find a video just on ASAN on her channel as she only covers companies and charities who are really messed up and historical events that could have at least been mitigated if not prevented).
I linked all the referenced videos on this post.
I low-key wanna attempt suicide just so i can get admitted to a hospital and people can actually know that im not okay and care for me a bit, im just tired of pretending to be okay all the time.