Getting Buried In Concrete To Explain How It Works
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- 게시일 2024. 04. 26.
- Concrete = cement + sand + gravel. Cement is the most important man-made material on Earth. Offset your carbon footprint on Wren: wren.co/veritasium . For the first 100 people who sign up, I will personally pay for the first month of your subscription!
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A huge thank you to Nevada Ready Mix for being willing to bury me in concrete, especially Elu Chavez and Mike Sherwood. www.nevadareadymix.com
And to Brandon Birchak of Six Foot Productions for providing the big fish bowl, safety equipment, planning and filming: www.sixfootcreations.com
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References:
Instant stone (just add water), Roots of Progress, rootsofprogress.org/instant-s...
rootsofprogress.org/cement-redux
Cement Chemistry and Sustainable Cementitious Materials
/ @cementchemistryandsus...
Ahmad, S., Lawan, A., & Al-Osta, M. (2020). Effect of sugar dosage on setting time, microstructure and strength of Type I and Type V Portland cements. Case Studies in Construction Materials, 13, e00364. - ve42.co/Ahmad2020
Seymour, L. M., Maragh, J., Sabatini, P., Di Tommaso, M., Weaver, J. C., & Masic, A. (2023). Hot mixing: Mechanistic insights into the durability of ancient Roman concrete. Science advances, 9(1), eadd1602. -- ve42.co/Seymour2023
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Written by Derek Muller
Edited by Trenton Oliver
Filmed by Raquel Nuno, Austin Bradley and Bryson
Animated by Ivy Tello & Mike Radjabov
Additional video/photos supplied by Getty Images & Pond5
Music from Epidemic Sound & Jonny Hyman: the Bill Wurtz inspired ‘Skyscrapers are made of sea shells’
Produced by Derek Muller, Petr Lebedev, & Emily Zhang
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For the first 100 people who sign up, I will personally offset the first month of your carbon footprint on Wren: wren.co/veritasium
P3oples emissions are not the main problem. Corporate emissions are.
Geopolyers have the potential to offset lots of carbon footprint,. I'll personally hold you accountable for that missing research.
No thanks, you obviously don’t understand the basic concept of carbon footprint, stay buried in that concrete.
@@littlegamer00 based
@@MrUssy101 Although not complete evidence, the carbon footprint was created by the oil company BP to distract from the proper cause of global emissions. And Exxon knew of global warming far before most people did.
With all the abstract science, it's nice of Veritasium to focus on something concrete once in a while.
ba dum tssss
dam that joke that's conk creet
Lol noice
That was solid 👌
learned that cement is based
Please explain spaghettification while falling into a black hole
Yes please!
he should fall into a giant bowl of spaghetti though
He did, but he mistakenly uploaded the video while in blackhole so data'ss stuck their in Blackhole
Gravity at your feet is stronger than at your head, meaning your feet are pulled more than your head, stretching you out.
@@samueljames0908 😂
@@samueljames0908 seriously
Anyone else laugh when he said “the difference between cement and concrete. People often mix these up”? I’m definitely adding that to the dad joke catalog
A moment of silence for the truma they will have to go through 😂
I thought I’m the only one who laughed 😂
Well what is the difference if you are so smart
@@mattc825it's in the video
@@mattc825The joke is the line "people often mix these up" because...
I'm a concrete truck driver and this video was not only very accurate but it also taught me quite a few things. Thank you
So the coke thing is legit? Have you use it?
young sheldon
@TheVictor454 no. It's not. We Have all kinds of different chemicals that we can use for things like that. Those types of specific chemicals are very expensive though so certain companies would probably do the Coke method. It does work.
@willelliot8928 who? What?
@@colinmackay92it’s a tv show
This might actually be the first time I’ve seen a hydraulic press being used for it’s intended purpose lmao
Lol , I know right. 🤣
The stuff in it still goes boom
hah
Commas on the other hand, still can't be used for their intended purpose.
@@xenokarasu homie wtf are you talking about
"I did not expect it to feel this heavy."
You said it yourself, Derek.
It's _liquid rock._
oh. Liquid Rock = awesome energy drink name! take that down!!! 😎
@@darkherostar protein drink?
Next, I want to see him bathe in Magma. That's ACTUAL liquid rock. And it tends to set up rather quickly. That would be a very entertaining video
@@ralphralpherson9441 well that's the most unpleasant idea ever
@@ralphralpherson9441 I'd like to see you bathing in magma.
At the burns outpatient ward at the hospital I work, a man said he got chemical burns from kneeling in cement. Good to see you have protection ❤
Oh yea. That happens and it’s rough. Really bad.
Another thing people don’t know is pouring concrete in the cold is super dangerous too. Getting your hands covered in wet concrete… it will suck the heat straight from your body so hard so fast that you can lose fingers or a hand as quickly as just minutes if you can’t get it off quickly enough.
Quite a number of times it almost happened to me. Got covered and felt it leeching the warmth from me and ran to the sink and rinsed so fast and then had to slowly turn up the heat to thaw my hand.
One more minute a few times and i may have lost fingers.
The pain is astounding. Both when freezing and when warming back up.
But make sure you hurry back to work. There’s good companies but a lot of these guys just hate you for anything. Almost lose a hand? How dare you wash your hands. Get back to work you baby.
I’ve had those burns. The scars last years
It's really bad with quick dry cement as it puts off a ton of heat.
Im so happy you finally mentioned "do not try at home" @19:22. There are many ignorant people out there that will. As you were being surrounded in concrete a kept having flash backs of my dad when i was a teen. He worked with concrete for many years. On one job concrete was setting as being poured due to mixer truck had broke while on way to deliver. So in the rush to get it poured so we could form it before full set, dad's boot was filled. He didnt have or take the time to remove boot and clean up. Kept working. By that evening we removed his boot got his foot and leg cleaned, as we cleaned , layers of skin fell off. And first few days after this while treating womb his skin was still rolling off. Took several weeks of ointments and bandaging and cleaning before it finally felt like the healing was happening. His foot and leg was scard for rest of his life. Wet Concrete is not something you play in!
As someone who has worked in the construction industry for a long time, but knowing nothing about concrete, the bottle of pop being mixed into the cement 100% sounds like something you'd tell a new guy to do lmao
Truth or fiction, KO stockholders love it.
Imagine the new dudes face when you grab the bottle from him and actually dump it in 🤣
@@J.C... then the building falls over because you've fucked it
We just keep a 5 lb bag of sugar on the truck, but yeah it works.
A few decades ago, French protesters poured sugar into concrete to prevent it from functioning. It takes surprisingly little sugar to render concrete mostly useless.
Every kid on a roadtrip ever has wanted to slide down the forbidden slide at the back of the concrete truck. And Derek actually did it.
that was my first thought.
As a concrete worker you actually have to do this sometimes, climb up the chute (in your case slide) and use your boots to push down the last bits of crete as you slide down. Only really do it in the case that we need every last bit on concrete
@@buzzintrippin That's a real solid way to get some concrete out.
Might be handy for a new foundation
@@buzzintrippin the little boys amongst us are cheering you on.
That’s not just a little boy dream. Every little girl I knew (myself included) wanted to slide down those things. It was on the list just below riding the equally forbidden luggage carousel at the airport.
I don't know if I have a medical issue or what but I'm literally addicted to this guys videos. I have a full time job with at least 20+ hours overtime and I've watched every single video he makes multiple times and even fall asleep to the videos I've already watched he reminds me of smarter everyday but these videos hold my attention more. Thank you so much for the videos.
Boy, can I tell you about the base PH of concrete eating skin. I've done many smaller concrete projects without issue, never wore gloves, and the worst effect is dry skin in the following days. But the largest job by far, was my own home foundation, and when pouring the footers, I was exposing myself to the wet concrete for very much longer. You know how if you're in a pool for a long time, your fingerprints and parts of the palm get all wrinkly. Well, that's saturated skin, and the base solution can dissolve that saturated skin quite easily, and that's what happened to me. No pain while it happened, and only because I noticed a little blood while screeding my forms, did I pause to see if a sharp stone may have cut me. I washed my hands, and to my horror, found all my finger/thumbprint areas and the palm at the base of each finger and thumb with holes eaten right through the skin. The next two weeks were very challenging and painful as they healed. I was surprised to see my fingerprints return though!
I don't do concrete work without gloves anymore. 😅
Nobody who doesn't know what concrete and cement is should be allowed to use it. Doing those projects without protection is just sheer stupidity
some people are more sensitive than others, i can handle and practically bathe in it without major issues
Thanks a lot for sharing your experience....it helps to understand how the possible harm operates 👍👍👍
OH, so THAT'S HOW YOU GET TRYPOPHOBIC SKIN
@@itsgonnabeanaurfromme But the people who don't know what it is don't know that it's dangerous
This really cemented my love for concrete demonstrations
Beat me to it 😅
i was gonna say the same thing, but i guess it's already been set in stone.
what a CONCRETE explanation!
What a lovely aggregate of pun enjoyers here!
20:51 now I know why she sells seashells on the seashore 🌊 (it’s highly profitable)
You have now cemented yourself as the best science/education channel. You don't just make stuff up you always have concrete evidence to back up your facts.
The clean editing really reinforces this content.
I see what you did there
A very solid and well grounded compliment. Rock on Bro
This comment goes hard.
@@norukamoah
Seeing you run through the gravel resurfaced some serious nostalgia. I remember going to these big gravel yards as a kid and running all the way to the top to tell my dad which mound was the best to grab from. What a time
As soon as you ran up that mound and flashed that bright, cheeky smile, I knew you were my kinda people 🏆
The seashell part had me rolling 😂
Please keep it up!
Welcome to the science community!! We have cookies.
@@TheReaverOfDarknessyoung sheldon!!
@@willelliot8928 Does he say that? Well of course he would. He's one of us!
I have first hand experience how concrete is caustic and dissolves skin cells. I had once a hellish concrete job in pouring rain, the pump truck was swimming in mud and the moulds were filling up with water, long story short, due to an almost biblical flooding that day (pump trucks have to empty or the concrete dries) we had no choice than fill up the molds even if we knew it was gonna be trouble. Due to the mud, the concrete started to burst through the groud from underneath the molds, and I had to get in there with a showel.. During the day I every now and then felt a tingling sensation on my hands while showeling, my gloves covered in slur.. Once the day was done and I removed the gloves, I saw that due to being soaking wet, concrete had turned into a soup, went inside my gloves and then marinade my hands in a caustic porridge through the whole day. As a result my fingers had turned black and had received 3rd degree burns. Turns out, unlike acids that cause a burning sensation, caustic attacks and numbs the nerves, so you hardly feel any pain, especially when frantically working to save the pour.
The fat and skin from my hands had basically dissolved away, and the chemical burns kept worsening due to the concrete causticity deeply penetrate my flesh. In the end I even had pockets to the bone in some places.. Recovery took an entire year with fixing the fingers, but today I have good mobility close to what it normally was. Be careful not to let concrete on your skin for long periods of time, it will eat through.
Thats wild. Ive worked with concrete here and there barehanded for projects at home simply becsuse i hate gloves, everytime i got some slight chemical burns and irratation from it.
I figured it was just silica burns. Washing periodically and directly after helped but the skin took a couple days to return to normal feeling without the tingling and constant dry sensation.
I never realized it was such a serious thing or could progress to the point you described here. That sounds horrific.
Thanks for sharing that story. Im sorry that happened to you while you were just trying to save a pour at your job.
❤ that sounds horrific. Thank you for sharing your harrowing experience. I hope you continue to have good health here after.
That made my skin crawl, no pun intended.
I was certain that you'd lost your hands completely based on that description 💀
For you to have recovered almost all of your lost functionality is absolutely incredible! I am so happy for you dude 🙏
@@TakeaSwigofTheJuice i agree. I can definitely imagine it all too well. Especially knowing what they mean when they say you dont really feel it much as its happening. The holes going to bones part got me. I think ill wear gloves next time.
The Pantheon _amazes_ me. Just casually still being around two millennia later, and _still_ being the largest unreinforced concrete dome in the world. Such an amazing link to a time and a part of the city that would have been recognisable and familiar to us, two thousand years apart.
It's mighty old.
The main reason that it's "still the largest unreinforced concrete dome in the world" is because people rarely use unreinforced concrete, and if they do, they definitely aren't building huge domes out of it.
Everyone should see the Pantheon in person, it's an ancient marvel and no other building in Italy felt as awesome to me. Such a beautiful connection to humanities past surrounded by modern buildings on all sides.
@@downsonjerome7905 Yeah but that’s the point. While we never went there again on the way they did, this pinnacle of ancient architecture has stood the test of time. None of our modern buildings will be as old as it already is, ever, if its maintained well enough.
@@Arcaryon Granted, we aren't trying to make things that last 2000 years. The engineer tells the client that it'll cost 10% more to make it last 40% longer (better materials, etc) and they scoff and just say, "Give me the 50 year infrastructure, I'll be dead when that fails - it'll be someone else's problem."
Thank you for Derek Muller, Petr Lebedev, and Emily Zhang for creating the Bill Wurtz inspired bit, 'skyscrapers are made out of seashells'. It was hilarious.
I was so surprised I though he collabed with Bill Wurtz at first it was perfect lol
JESUS AND GOD LOVES EVERYONE SO MUCH TURN TO THEM BEFORE ITS TO LATE
@@mrbumbles221 JESUS AND GOD LOVES EVERYONE SO MUCH TURN TO THEM BEFORE ITS TO LATE
Shout out to all the crew being so chill and sharing in your joy ❤
As a structural engineer, I really appreciate this video. Concrete is such an incredible material and most people don't realize just how impressive and important it is.
The fact that this method of architecture has been used for thousands of years is so cool to me. Makes me wonder if there was ever a point to where concrete makers had to convince everyone that it was given by god because of how powerful basic science was at the time lol.
It's very useful but it's just a shame that it's has such an important environmental impact. Not to mention we're running out of sand.
Today, architects always go for the default concrete buildings and don't even consider other alternatives that are totally viable.
It's a bit like petrol fuel : it's a very useful resources but when ended up using it way more than necessary.
@marz6770 yeah you're right. I was kinda just talking from an engineering materials perspective. But yeah from an environmental aspect it's not great. But tbf, it's also partly because we just use so damn much of it. If we used basically any material in that quantity then that material would probably cause huge environmental issues.
I never thought about it until I started working as an inspector. I work in the lab sometimes and it always amazes me how strong concrete can be.
@@skullkrusher4418 I agree the quantity makes it worse.
The thing is we do have alternatives that actually have less impact but we're just addicted to concrete. We use it even for regular sized buildings that could be wood or other materials that are totally viable.
Also I did mention that we're running out of sand but we also destroy entire ecosystems while digging it.
As a concrete worker it’s nice seeing someone make a video about it. It’s dramatically under appreciated yet it’s in everyone’s daily lives. Thanks for the video
I agree! I am a Comcrete Technician, and Concrete itself is everywhere, but before I worked in the field, I didn't know just how deep the field goes. From The beginning of the Production line of Extracting the Materials, the Cement Production with it's own deep field thats now changing drasticly, the Way we Recycle Water and it's composition the Mixer needs to always consider in combination with the types, to the Plant that helps combining the materials created by Hundreds of years of Innovation, to the Responsibilites of Upkeep, Repairing and Dispositioning, followed after the mixing by chemicly testing it through(in the EU) 23 different possible methods depending on the Consistency it was mixed to, it's a field that requires you to consider a multitude of different aspects. It's hard to get into the field, but it sucks you in. It's not for everyone, especially with the labor aspects as it requires you to overexert your energy quite a lot, for a Mixer or Dispositioner, 12 to 15 hours of work per day are very common, and it takes a heavy toll, but I fell in love with it.
I agree ! I’m a concrete dispenser, and it’s certainly feel bad that I can no longer inject concrete into kids rectums with this new found child safety laws & guards at every kindergarten and school.
@@andrei_chikatil0 That is the most off-putting, bizarre comment I've ever seen.
as a non-concrete worker, i have a new appreciation for concrete :D
As someone who drives dump truck I have a hard time believing that there is more concrete made than asphalt
Now you are talking my language, I work in the ready mix delivery industry and this fine explanation is very helpful and interesting…. Thank you!
It was really fun watching this video, reminded me of the time I spent in a lab testing concrete cylinders out of highschool.
Something I didn't ever see mentioned in the video was that highest PSI does not always equal best concrete. for example, the landing strip at an airport wants a lower PSI tolerance because that in turn results in more flexible concrete, allowing it to endure the impact of the airplane. Then say for a building support column it wants higher PSI as it isn't expected to handle impacts, just bear a heavy load.
Take what I say with a grain of salt though, as this was several years ago, maybe it has changed since then, but if so I haven't heard about it.
21:00 the little bill wurtz section caught me off guard, but is quite welcome. definitely feels like something he would say!
"People often mix cement and concrete up"
That's true, they even made machines to do that for them.
💀
Cement is an ingredient in concrete. Concrete is the final product
I clicked on this video expecting something boring but bro explained everything👍💯🌟
ngl I'd watch an extended cut of this. Really enjoyed all the coverage of the operation of the plant as it brings all that theory and history to life.
I laughed so hard with the bill wurtz "skyscrapers are made of seashells" song, loved it!
@@turtletrimmings because bill probably is like a mystical elf that lives in the woods and does things at his own time.
@@crackedemerald4930 nah bill is in charge of time
@@ObjectsInMotion it is not the real Bill Wurtz. The singer is imitating Bill's style well, but it's not his voice.
Bill Wurtz does a much better job than this, but the reference was appreciated 😂
That still doesn't explain how the three seashells in Demolition Man worked... maybe Derek could make a video on that? :P
20:45
This guy added a Bill Wurtz reference in the middle of an educational video
What a legend
I was immediately wondering if that came from Bill Wurtz. Glad to know I wasn't mistaken
Another top story from Verta we just Layed a slab for a patio 8m2mts hard yakka when youre 20 yrs older digging wacking mesh formwork and spreading etc
i remember running about in my 40s with so much energy thought i'd never slow up but life takes it toll
JESUS AND GOD LOVES EVERYONE SO MUCH TURN TO THEM BEFORE ITS TO LATE
Retired architect here. Cement is the glue that binds aggregate together to make concrete. Concrete is thus a composite of Portland cement and aggregates. So saying cement and concrete are "mixed up" isn't just a bad pun. It further confuses the issue. Cement is often mistaken for concrete, and visa-versa is more accurate way to state the problem.
Cement = expensive chemical glue that cures through the process of hydration
Aggregate = cheap, inert structural filler
Admix = something that modifies the structural or aesthetic properties of the finished concrete, or the chemical properties of the Portland cement glue. Some admixes do both. It's all very complicated - trust me...
..and skyscrapers are not made of seashells. Their floors are. Their structures are made of mainly of steel and enclosed by glass hung from extruded aluminum sections, usually with lightweight, non-structural concrete floors poured into corrugated steel pans that span between secondary structural elements like wide-flange beams or light metal trusses. Most of concrete serves two main purposes - fire resistance and sound isolation. The only load bearing concrete will generally be low in the structure and used as footings, or sometimes as shear walls higher up. This is because thick load bearing structural concrete is ill suited for use in very high buildings due to it's mass.
Finally, infrastructure is not made from concrete alone. Bridges and roads and sidewalks are composite structures of concrete and steel reinforcement bars (rebar) engineered to exploit the compressive strength of concrete and the tensile strength of steel
You know the guys at the plant had a very good day. Someone appreciated their work and captured it and made it easier for others to understand. Look how passionately they tell you of the process in the strength test.
My dad was on the crew that built Glen Canyon Dam at Lake Powell. There were always rumors that people were buried in the concrete while they were pouring the dam. When asked, he would mention the density of concrete (the same reason you can't sink in lava or molten steel), and the fact that they only poured 4 inches deep at a time. He would end with, "...so that's why no one was buried in the concrete of the dam. ACCIDENTALLY."
Accidentally 😳
How would you intentionally bury either?
@@shoam2103 lace the body with something denser than concrete, and bury over a few days, 4 inches by for inches.
That would be my guess for this exact case.
If you have a column to mould, then just tie the body to rebar, and pour.
I kept flashing to the whole stories of mafia bosses burying people in concrete floors. Cool meme I guess but highly not practical.
All though, I guess you could weigh them down with already dried concrete then pour fresh over them. 'Course, non of the movies or tvshows ever did that.
If one would pour concrete over a dead body in the bottom of a hole, it would NOT come up and float. The wet concrete would simply cover the body, and harden with the body still on the bottom.
this is crazy i have exam for my building material class and i was wasting my time on youtube when i come across this video which is super helpfull thank you so much
Dude, I’m a concrete mixer driver and I had no idea about how the stuff was made! 😆 Super cool!
A thing to note about the confusion with cement and concrete is that some people "mix them up" because in their languages cement and concrete are called the same word.
Wonder what language. Maybe people just don’t know their is also a different word. I speak 4 languages and there’s always a word for both. If you’re not in the industry you just don’t care I guess
so did these guys
cement powder
that's rich
@@mrcsrkcrzI speak Hebrew and it happens in it
In Dutch cement remains cement and concrete is beton but we mix it up.
I'm a civil engineer. In my country (Guatemala) almost every structure is made out of concrete. I love how you simplify everything about concrete in this video! I worked as head of laboratory in a concrete laboratory. This video is great. Thanks you!
Bros a civil engineer 💀☠️😭
@@Hi-xg9qr got more subs than u
Concrete lab head sounds like a cool job to have NGL.
GOD'S STANDARD FOR HEAVEN IS PERFECTION AND ONLY JESUS (THE SON OF GOD/GOD IN THE FLESH) LIVED THAT PERFECT LIFE! HE LAID DOWN HIS LIFE & TOOK THE WRATH OF THE FATHER ON THE CROSS FOR YOUR SINS! GOD IS JUST SO HE MUST PUNISH SIN & HE IS HOLY SO NO SIN CAN ENTER HIS KINGDOM OF HEAVEN. IF YOU ARE IN CHRIST ON JUDGEMENT DAY GOD WILL SEE YOU AS HIS PERFECT SON (SINLESS SINCE YOUR SINS ARE COVERED BY JESUS' OFFERING). YOU CAN ALSO CHOOSE TO REJECT JESUS' GIFT/SACRIFICE & PAY FOR YOUR OWN SIN WITH DEATH (HELL) BUT THAT SEEMS PRETTY FOOLISH! GOD SEES & HEARS EVERYTHING YOU HAVE SAID & DONE. YOU WONT WIN AN ARGUMENT WITH HIM & YOU CANT DEFEND ANY OF YOUR SINS TO HIM. YOU'RE NOT A GOOD PERSON, I'M NOT A GOOD PERSON... ONLY GOD IS GOOD! WE'RE ALL GUILTY WITHOUT ACCEPTING JESUS' SACRIFICE FOR OUR SINS!
MUHAMMAD DIDN'T DIE FOR YOUR SINS, BUDDHA DIDN'T DIE FOR YOUR SINS, NO PASTOR/NO PRIEST/NO SAINT/NO ANCESTOR DIED FOR YOUR SINS, MARY DIDN'T, THE POPE DIDN'T EITHER, NO IDOLS OR FALSE gods DIED FOR YOUR SINS, NO MUSICIAN OR CELEBRITY DIED FOR YOUR SINS, NO INFLUENCER OR KRplus STAR DIED FOR YOUR SINS, NO SCIENTIST OR POLITICIAN DIED FOR YOUR SINS, NO ATHLETE OR ACTOR DIED FOR YOUR SINS! STOP IDOLIZING & WORSHIPING THESE PEOPLE!
JESUS CHRIST ALONE DIED FOR YOUR SINS & WAS RESURRECTED FROM THE GRAVE! HE IS ALIVE & COMING BACK VERY VERY SOON WITH JUDGEMENT (THESE ARE END TIMES)! PREPARE YOURSELVES, TURN FROM SIN & RUN TO JESUS! HE KNOWS YOUR PAIN & TROUBLES, HE WANTS TO HEAL & RESTORE YOU! TALK TO HIM LIKE A BEST FRIEND! ASK HIM TO REVEAL HIMSELF TO YOU & HELP YOU TO BELIEVE IF YOU DOUBT! DON'T WAIT TO CRY OUT! NO ONE IS PROMISED TOMORROW! HE LONGS FOR YOU TO INVITE HIM IN, HE LOVES YOU MORE THAN ANY PERSON EVER COULD, HE CREATED YOU!
Jesus answered, “I am the way and the truth and the life. No one comes to the Father except through me."-John 14:6
"But whosoever shall deny me before men, him will I also deny before my Father which is in heaven."-Matthew 10:33
“For the wages of sin is death (hell), but the gift of God is eternal life in Christ Jesus our Lord”-Romans 6:23
@@JESUSCHRIST-ONLYWAYTOHEAVEN
Cool story bro.
Actually... Pretty bad story bro...
Hey Derek,
Really love your videos. I find them really really interesting. I'm a student preparing for my 10th exams , and yet your videos are still understandable. Thank you for all of that. Keep it up. :)
It is more informative than what i got from class in civil engineering. Thankyou for sharing
He's becoming the physics version of Steve Irwin.
"I'm gonna explain concrete, FROM THE INSIDE!"
He’s lucky concrete don’t sting
Except Steve educated millions of children to help preserve the environment as it was tied to animals and their ecosystem which in turn, includes us. This video was about concrete for soulless corporations.
@@BleedForTheWorld for souless corporations?
@@crackedemerald4930 yes
@@BleedForTheWorld How is that you completely missed the point of the video? Ideology-filtered thought makes people say goofy things.
The fact that there is a "Cement Driver of the Year" award kind of shows how valuable an resource concrete is
instead of “an”, use “of a” or “the”
Such an interesting video, I enjoyed learning about concrete way more than I ever thought I would lol
I didn’t though I would find this that interesting, really liked this!
Can we all just appreciate Mr. Chavez for a moment how well he explained everything. A true professional
be honest Bissonette James, are you secretly History Matters?
@@nailil5722 i think not
@@nailil5722 his account was made in Jan 2021
THE LEGEND HIMSELF
443rd 👍
I've worked around concrete my whole life, and I've heard and had myself so many misconceptions about it. Derek explaining it visually like this is so effective. The Veritasium team really has this method of science education figured out.
@Dont Read Profile Picture alr then
@@FlaviusFlav except for that fact that these mainstream "science" channel only push the same industry narratives, and don't encourage REAL scientific thinking. they will never tell you that no virus has ever been isolated, or that human contribution to climate is minor and this is a part of natural cycles, or that the universe is electric not gravitational. science supports all these things, but there are monetary interests preventing this information from being discussed.
@@FlaviusFlav Nice bait increase by a second account. Or if not, a talented person/musician should never need this type of clickbait to gain traction. That's a deep misunderstanding of the YT platform. All you need is to make good content and the algorithm takes care of the rest.
@@FlaviusFlav You should never pay attention to such comments/profiles though.
@@Muskar2 cap, theres so many people that are talented and get no recognition from the algorithm because of people like the bot account that try to break the algorithm, so u either have to do what they do (or something similar to attract attention) or just get lucky
I'm glad they brought up the idea of a trench collapse. I watched the video because I wondered how exactly you expected to be able to breathe. Trench collapses are a big concern when it comes to Workers' Compensation for that reason.
that bill wurtz style "skyscrapers are made of seashells" part was great!
I’m a programmer, I actually worked with scientists on a concrete formulator a few years ago! You would input the properties of your cement, sand, aggregates, additives, plastifiers, etc. and what use for it (in saltwater, for a residence, etc.) the simulator would try to optimise the quantities to get you the cheapest concrete that matches the required strength! There would be lots of variables to consider: you want to use as little cement as possible while keeping good strength, so you’d be pressed to use sand but it’s expensive as well, so you will use coarser aggregates to fill it up a bit, but it affects strength too, so you want to add some additives to compensate for it, it all is a matter of carefully balancing expensive stuff that give strength and cheap stuff that give volume!
Outside verifiable facts like density, volume and pH, it also pretty much is an empiric science: formulas are deduced from past observations, and you usually know what properties to expect based on the granulometry of your sand and aggregates, the ratio of water/cement, etc. In the end, my program used a lot of manual-like algorithms - nudging sliders, checking variations and extrapolating ideal values based on that. Just what people formulating concrete do, just automated. This was one of my most fun projects to work on, people usually assume concrete is easy to do and half ass it, but actual, professional concrete has so much reflexion and cleverness behind it!
So true & great write-up! I'm retired now, but have had positions in the full gamut of the concrete field/industry. Not boasting by any means, but kind of a "you name it, I likely did it" thing.
We were less fortunate and often did the mix designs manually, accounting for every property, specific gravity, particular conditions as SSD (saturated surface dry) for the aggregates, water/cement ratio, and countless other properties, materials, and variables.
Concrete is, by far, the most misunderstood field/industry ever, as viewed by the general public. The true pro's in this field, no matter what level, are truly underestimated and amazing.
Most ppl wrongly assume so many things about concrete. Just as a basic example, I had friends years ago that said how easy they 'thought' it was.
Then I gave them a 12" x 12" x 12" wooden box and asked them how hard would it be to just hold that box full of concrete. They laughed and said it would be 'Easy Peasy' and "What's the catch"?
They found out there was no 'catch' and how shocked they were when they failed at holding it, as they had no idea that concrete actually weighs 150 lbs per cubic foot, which was the size of that "small box".
*How come you can't use the white sand that Home Depot sells for kids' sandboxes? I've tried it a couple times just to encase conduits, and both times it took days to harden. It probably never got as hard as it should have, but fortunately that wasn't important for what I was doing.*
@@TheRealCheckmate Aside from some 'chemistry' differences between play sand and typical graded sand for concrete, the main 2 big differences that makes play sand far less suitable for concrete mixes is:
1. Play sand is a manufactured/processed sand and consists of very rounded & 'smooth' sand granules, which cause less adhesion and 'bonding' to the Portland cement. Good concrete requires sharp and angular sand particles, which is exactly what concrete-grade graded sand is.
2. The other big difference is that play sand consists of much finer (smaller) sand particles, but even more importantly is that these sand particles have a much narrower size distribution instead of a wider range of particle sizes.
In concrete material testing & mix design, we run test samples of sand thru a 'nest' of about 6 progressively smaller mesh sized sieves, with the top sieve catching sand particles larger than approx 1/10" and each successive sieve (in the 7-8 sieve stack) with mesh slightly smaller than the sieve above it. The smallest mesh sieve at the bottom of the stack would trap the finest particles, between .006 to .003 of an inch in size.
A pan below that would catch all dust and fines, which is also considered/counted.
Quality concrete requires a very specific range of % of sand particles trapped for each sieve size, for an overall wide size range distribution.
Play sand has far too few (to zero) of the top 3 or so sand particle/sieve sizes and a far too high of a % of the smaller particle sizes.
@@markstone1619 Thanks for that. What about chemically? This stuff is white, instead of the typical tan color. If I had to guess, maybe it's all SIO2?
Interesting, what kinds of algorithms did it use? Were there formulas that it could use to calculate the component quantities, or was it more of a brute-force approach? What language was it written in? How many lines of code, if you had to guess?
Was not at all expecting a Bill Wurtz crossover
You know when he started talking about sealife millions of years ago that reminds me of the bill wurtz's history of the world
Best video for civil engineer .. BMC and Concrete Technology
One of the best 24 mins i have spent on KRplus ,,,,,,,,,,, " Great Vid "
I like how he says people often mix up cement and concrete, and then he says "so this is what it looks like inside a cementtruck" and ads a *concrete truck* to the cut
In the US, they are used interchangeably, correctly. It’s been long enough to become part of the language
@@tkalle1299they are used as the same, but they are definitely not. When people refer to concrete as cement, that is incorrect.
@@vinceruland9236 check the dictionary.
😂😂
@@tkalle1299
"Cement truck" refers to a dry bulk trailer hauling the actual cement powder used to make concrete. At a concrete plant the distinction is important
25 years in cement, quicklime and one thing you did not mention, fly ash (it was on the batch recipe you showed). Great video. I would point out that wet concrete is basic (high pH) but not really caustic. Prolonged exposure can irritate skin but it will not make a hole in you. Another point is that coal fired power station fly ash is widely used to substitute up to 35% of cement in concrete making it stronger and more durable. This is because the ash is mostly glass or aluminosilicate which is activated by the calcium hydroxide just like the volcanic ash in the Roman concrete. They even call this a pozzolanic reaction. The very fine particles of the ash make the concrete less permeable.
For some aspects, like surfaces for roads, where we need to get rid of water, wouldn't higher permeability be better?
@@Parciwal_Gaming it’s not really feasible because anything permeable will just make the foundation under the road unstable and sand and junk will very quickly fill the pores and put an end to the process anyway. They do make it though. Look up pervious concrete.
It’ll definitely make a hole in you. People have skin fall right off their muscles if left untreated too long.
@@donaldham308 LOL dont listen to this guy. If you are bare skinned against cementitious material long enough for that to happen youve got more to worry about...like when the mafia decides to stop messing with you and throws you into the river.
@@donaldham308 Not likely it will make a hole in you. But also, "can irritate skin" from the OP is a massive understatement. Chemical burn from prolonged exposure to wet concrete is realistic
Thank You Very Much For Explain This Basic And Ignored Material In Our Lives!
8:00 best part
Calcium Silicate Hydrate (limestone + glass) sponge is only so strong, at that point you have to substantially substitute and supplement the compounds for stronger ones, add high tensile strength fibers, wrapping the outside or replacing the reinforcement bars with composites.. Eg using aluminum oxide replacements for some of the matrix, optimizing the particulate mixes sizes and shapes, picking the right fillers..
My PhD is on something concrete related that is fascinating, but that almost no one knows about. In very simple terms, there's this reaction called AAR (alkali-aggregate reaction) and it causes concrete to swell from the inside. When certain conditions are met, an expansive gels forms within the concrete pores and the structure literally starts to expand. As concrete is very bad in tension, a lot of cracking develops and several structural problems arise. I am working on doing computer models of this, and it is fascinating to see rebar on bridges yield and gates on dams getting stuck because of this reaction. Fun nerdy fact some people might find interesting =)
I know of quarries you can't use the aggregate in concrete for because the ASR is so bad.
Can't we develop something that strength itself by CO2 rather than water?🧐🧐
That's true, that's why they put lines in making a concrete highways
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How do you do computer models for this? Like is the model derived from the theory or from the data?
If you didn't come from Tiktok raise your hands ✋😊.
✋
✋
✋
Shut up
Phuck TikTok!
This subject is more fascinating than the 'food channel'. Both processes of cooking and making concrete are eerily similar....especially the dough spreading part.
im sure thats what the trees in the petrified forest have in them after being petrified, now here i can tell there were a few of the trees that i hear you say are mountains, old tree stups and localy they make portland out of two stumps to this day but almost gone, well kudos for your video shows your learning ❤
They used an excessively high slump mix out of caution, which makes it way more buoyant. You can get buried in low slump concrete with the additional friction between you & the mix and the additional cohesion of the mix itself above you.
That mix was basically water, it formed a flat puddle xD Which unsurprisingly, is not a fun thing to receive on site when you are expecting a stiffer mix.
I wanted to see him in concrete that he would get stuck in
Either the mix had a lot of extra water in it, or they added chemical plasticizers to make it flow more. As I mentioned earlier, it looks like the new spread test (ASTM C 1611) is becoming more popular than the ol' standard ASTM C 143 slump test. I've done hundereds of slump tests, but had never seen the spread test until now.
@@schuhey7021 *I got a batch once that started cooking off as soon as it came out of the chute. Fortunately it was just a small load for an AC condenser and I just barely managed to trowel it out. It ended up with little crazy cracks everywhere. I was **_PIST!_** It was probably someone else's leftovers.*
@@bripslag Honestly had never seen the spread test until this video... I'm a slump man through and through, haha.
As a civil engineer that specializes on reinforced concrete: AMAZING VIDEO, congratulations, it's really well done!! It would be even better if you showed the weakeness of Portland Concrete and why we reinforce it with steel, but it is a whole new subject. Amazing, man, well done!
what is the weakness?
is it because it's brittle on its own?
@@CureSmileful No it is because while concrete is excellent in compression, it is weak in tension. The reinforcing steel is placed in the areas of the concrete that will be subjected to tensile forces (bottom of beams/slabs, etc). This is the simplest answer, but steel serves other purposes (crack prevention, freeze thaw, etc)
@@arineey4538 And an important part of using steel instead of something else is that concrete and steel behave very similiary in regards to thermal expansion. So if it gets very hot or cold it doesn't tear itself apart.
What’s the weakness of Portland concrete?
How did I randomly land on a video about concrete..idk. But I will say they did a great job on this one. It was actually very informative and fun to watch.
The thing that caught me most off guard was the insane basicity. Never would have expected it since I learned about concrete when I was a child, but today as a budding chemist, I had a horrified reaction to hearing 11-13 pH ngl.
I never though I would be more invested in a concrete video than today lol
Sky scrapers are made of seashells!
Really cemented my interest in the topic
20:50 Unexpected Bill Wurtz is always appreciated.
I actually scrolled down, just to find a comment about how Bill Wurtz ended up in this video. xD
The "well, that was weird" face was gold too.
@@dasimonmusic9384 is it actually bill wurtz?
@@TheLaXandro absolutely xD
@@youtu.behandle it didn't quite Sound Like him. So, i guess it's someone Else who sings it. But it IS 100% inspired by Bill Wurtz xD
I work at MAPEI as a mixer operator, our plant produces a lot of self-leveler, floor tile mortar, grout, and mudbed mixes, as well as some other specialty products like Mapecem Quickpatch and Ultratop or Plantitop. We use a lot of the materials described in this video, and so having a better fundamental idea of why each material is relevant in our formulas for the different products is pretty cool. We use 'Calcium Carb' aka limestone in probably most of our products, and sand, as well as grey and white cements. Edit: Yes, we also use "Portland Cement" as the main ingredient in 1 of our products and a supplement in a few others. Hate using it. Theyre 94lb bags and I gotta lift over a dozen to cut it open and dump it in. 😢 2nd edit: Agree on the sand sizes.. We use so many different sizes and if the wrong size ends up in a batch, even due to the previous production run not being adequately 'flushed', it can cause a contamination that ruins the batch; often between 4,500-5,000lbs.
Always liked this channel, and I've always been fascinated by cement, and concrete. I thought it's called cement when it's wet, and concrete when it's hard. Well that's mostly accurate since reversing the terms would be totally wrong. Before this, I heard about the lost formula, and was always amazed that it took almost 1000 years for it be discovered, or re-discovered.
20:55 That Bill Wurtz-ish section really caught me by surprise, in a good way! Love it, keep up the great work!
Sky scrapers are made of sea shelllss
I just love people's blank stare as I tell them their concrete will cure much better if they dont let it dry out lol.
This videos such a joke, pouring a 27" slump on yourself and seeing how it feels, saying it's tough to step out of. Pour a 6" or a 4" and tamp it down, then holler at me.
@@RohirimSassHave you ever heard the story of Darth Plagueis the wise?
@@RohirimSass Are...are you under the impression that this was a challenge video? Like Derek had to get out of the concrete to win $100,000?
@@RohirimSass yonem beokye ENNEWOT WEPNEDDLY'S UNMITURIOUSLY OMEDOME-DA !!!!!!
@@RohirimSass cragmaggle snackle....
This man is so dedicated to teaching us that he brought concrete evidence
never knew a video about concrete would be so interesting
19:18, this totally disrupts my plan for this weekend and I am severely distraught
It amazes me how much of our world revolves around concrete. So simple and yet so critical and interesting.
You're welcome
🤓
Please talk about 'green' concrete. The new Formulations coming out now that either reduce their CO2 output or use another chemistry that doesn't rely on lime.
@@devp3353 shut up
@@JLK89 yes! "Green" concrete is really cool!
Great video and a great topic!
I was wondering if you would make a small video on the quality of concrete. Here you met with serious professionals but it is common that certain companies or not so ethical people would make concrete of not such great quality. I was wondering what were the techniques to make the concrete cheaper, but potentially of lesser quality, and what would be the issues.
this videos are so grat.. and such a nice change of pace from the internet crap... btw i discover this channel from the shorts
studying material scientist here. great video. what amazed me when studying concrete, and that the engineers started to touch on, is that concrete is never "hard" and it will keep hardening indefinitely but engineers decided that ~30 days is "hard enough". pretty wild to think about, and is especially funny when you realize something being "concrete" is generally a term for being unchanging
“Strong enough” is normally driven by how quickly the next step of construction is needed. You don’t want a concrete bridge deck to wait half a year to get to the point where it is strong enough for vehicles to drive on it. Timely strength gain is driven by constructability requirements.
@Josh Olson which is one reason we have high early strength mix designs.
28 days is when you get diminishing returns on strength over time. Prestressed concrete have their strands cut a day or two after casting to stress the concrete then they're moved to sit for a month before shipping out. Concrete is already strong just after a couple of days.
@@justinrobertson5493 I have been testing construction materials for 30 years. Pretty strong is not strong enough to use for holding up a floor in a CIP mid-rise, or an intersection of a major thoroughfare. I've tested concrete with synthetic polymers and fiber mesh additives designed to hit 6kpsi at 4 hours just so a section of tollway can be re-opened to the public. At 7 days you expect at least 70% of design strength. If you get less than 60%, it should throw up a red flag. That is if you have the luxury of waiting 7 days to see obtain that strength.
"concrete" is the opposite of "abstract"
was that the influence of bill wurtz at 21:06
i was thinking the same.
maybe bill wurtz is taking over KRplus 🙂
I have waited a long time for this
this is one of the best youtube video ever for me.
I love how the safety glass just fell over and the machine still keeps going
The safety glass is from the video production team, not from the cement/concrete factory. The proof: The metal door with the grid is open the whole team to be able to film the slow motion trough that piece of safety glass brought to the site by the camera crew.
I was scared.
It's not an integral part of the machine so there was no interlocking
Notice the guy that operates the machine stood back behind everyone else 😮💨
"I am about to get buried in concrete" is a Tom Scott type of opening and I'm all for it
This video did have a more Tom Scott-esque vibe than usual, the way it goes off-script to show the immediate reaction.
Interesting, for the "Aggregate" we in Germany use simply gravel. Different ranges of size in the stones for the different appliances.
Concrete has very little tensile strength yet fairly good compressive strength.
Hence embedding a material with considerable tensile strength (rebar). Another way is applying tension to the rebar and keeping that tension until the concrete cures. This results in the tensile stress in the rebar creating an initial compressive stress in the concrete. This allows the composite material to resist greater tensile loads.
Very interesting, didn't knew that.
Love the constant education! Also love the Bill Wurtz styled moment lol. How much of an impact does concrete have on the environment?
Look into "hempcrete" an alternative environment-friendly and way better at keeping the cold out and taking less to heat up. It does cost more per cubic meter but it is not shock resistant so if u live somewhere quiet it is a good option
@@GingeroFee Will do! Thanks!
Vox just made a video on this
@@jaydencapper6492 Well that is interesting timing lol. I'll check it out!
Haha that bill wurtz clip was great xD
One of your best videos in recent memory. I would love to see more of this kind of format where you go and scientifically explain the chain of manufacturing things commonly used in modern society that the average person hardly thinks about.
Also, love the unexpected Bill Wurtz reference.
just goes to show how much of a genius Bill is. Bill's got a funky, jazzy style that works so much better in this format than the nursery rhyme vibes in this video
Reminds me of the show How It's Made, except with Veritasium's humor. Loved it!
How its made was one of my favourite shows as a kid. As an adult I think I'd appreciate a Veritasium version a lot more.
A soon as I saw it, I had to rush down to the comments to see if anyone else got it.
I think a huge reason you could not sink was because of your dry suit. Like the incident were a man died from swimming in a whirlpool. He was fine because the dry suit created air bubbles that kept him up float. But once he put his head under, he sunk straight down. Hopefully that helps you guys know why you couldn’t sink
He couldn't sink because that concrete was nice and plastic and it's about 2,5 times heavier than him. Simple buoyancy.
thx for the comprehensive video 🙏👍
Concrete being the pillar of modern civilization is such an underrated and underappreciated invention. We don't think of it much, but we're surrounded by tons of this stuff in our everyday lives. My family is building a home so I get to be around construction equipment, and it's such a fascinating process to see a wall being erected without using bricks.
GOD'S STANDARD FOR HEAVEN IS PERFECTION AND ONLY JESUS (THE SON OF GOD/GOD IN THE FLESH) LIVED THAT PERFECT LIFE! HE LAID DOWN HIS LIFE & TOOK THE WRATH OF THE FATHER ON THE CROSS FOR YOUR SINS! GOD IS JUST SO HE MUST PUNISH SIN & HE IS HOLY SO NO SIN CAN ENTER HIS KINGDOM OF HEAVEN. IF YOU ARE IN CHRIST ON JUDGEMENT DAY GOD WILL SEE YOU AS HIS PERFECT SON (SINLESS SINCE YOUR SINS ARE COVERED BY JESUS' OFFERING). YOU CAN ALSO CHOOSE TO REJECT JESUS' GIFT/SACRIFICE & PAY FOR YOUR OWN SIN WITH DEATH (HELL) BUT THAT SEEMS PRETTY FOOLISH! GOD SEES & HEARS EVERYTHING YOU HAVE SAID & DONE. YOU WONT WIN AN ARGUMENT WITH HIM & YOU CANT DEFEND ANY OF YOUR SINS TO HIM. YOU'RE NOT A GOOD PERSON, I'M NOT A GOOD PERSON... ONLY GOD IS GOOD! WE'RE ALL GUILTY WITHOUT ACCEPTING JESUS' SACRIFICE FOR OUR SINS!
MUHAMMAD DIDN'T DIE FOR YOUR SINS, BUDDHA DIDN'T DIE FOR YOUR SINS, NO PASTOR/NO PRIEST/NO SAINT/NO ANCESTOR DIED FOR YOUR SINS, MARY DIDN'T, THE POPE DIDN'T EITHER, NO IDOLS OR FALSE gods DIED FOR YOUR SINS, NO MUSICIAN OR CELEBRITY DIED FOR YOUR SINS, NO INFLUENCER OR KRplus STAR DIED FOR YOUR SINS, NO SCIENTIST OR POLITICIAN DIED FOR YOUR SINS, NO ATHLETE OR ACTOR DIED FOR YOUR SINS! STOP IDOLIZING & WORSHIPING THESE PEOPLE!
JESUS CHRIST ALONE DIED FOR YOUR SINS & WAS RESURRECTED FROM THE GRAVE! HE IS ALIVE & COMING BACK VERY VERY SOON WITH JUDGEMENT (THESE ARE END TIMES)! PREPARE YOURSELVES, TURN FROM SIN & RUN TO JESUS! HE KNOWS YOUR PAIN & TROUBLES, HE WANTS TO HEAL & RESTORE YOU! TALK TO HIM LIKE A BEST FRIEND! ASK HIM TO REVEAL HIMSELF TO YOU & HELP YOU TO BELIEVE IF YOU DOUBT! DON'T WAIT TO CRY OUT! NO ONE IS PROMISED TOMORROW! HE LONGS FOR YOU TO INVITE HIM IN, HE LOVES YOU MORE THAN ANY PERSON EVER COULD, HE CREATED YOU!
Jesus answered, “I am the way and the truth and the life. No one comes to the Father except through me."-John 14:6
"But whosoever shall deny me before men, him will I also deny before my Father which is in heaven."-Matthew 10:33
“For the wages of sin is death (hell), but the gift of God is eternal life in Christ Jesus our Lord”-Romans 6:23
I think people on the internet don't know the the meaning of underated 😅
@@JESUSCHRIST-ONLYWAYTOHEAVEN why are you screaming
@@bugg4938 CAUSE HE WANTS YOU TO BELIEVE IN *GOD* ESE
@@rickool07 Pretty weak god if he needs people to believe in him.
You're the kind of teacher that everyone dream to have.
Having him as a teacher would be too good to be true...
Yeah he’s really fantastic. Such a cool video.
*dreams
I don't want my teacher to try to kill himself
@Don't Read My Profile Picture You are the worst.
You want really strong cement, you have to mix in microfibers, because when the cylinders "explode" in failure, it is the concrete's lack of strength in tension that caused it to break up. Even though the cylinder is being compressed, as the cylinder gets shorter it starts buldging in the middle, which means that middle concrete now is experiencing some tension in the horizontal direction. My house's foundations (floor, walls, and even some basement ceiling/roof) are made of 16" thick slabs of EPS foam (like a styrofoam cup), which has less than an inch of glass fiber reinforced concrete plastered on the inside and outside surfaces to make it structurally strong enough (and weatherproof) to carry the whole house.
Good for you doing for science , don't forget it heats up badly during drying
I just love how something "simple" looking is actually quite complex with so much thought behind it.
its why we shouldnt take things for granite
@@mrbushi1062 nice.
@@mrbushi1062 good one
@@mrbushi1062 lol you rock!
I work for a small company that sells bricks and masonry supplies and I will be forwarding this video to all the salesmen I work with. I knew a lot of this info, but I’ve yet to see it presented in such an understandable way!
Why not sell geopolymer bricks? Why wasn't THAT mentioned in the video?
@@chisaomusician7752 Why don't you stop living? That's the best contribution that you can do to reducing pollution in the world.
@@randomvideoboy1 Why do you care? Is rock something too hard for you to understand?
@@randomvideoboy1 you speaking facts ngl
Thanks for the education!
I'm a Civil Engineer. This video takes me back to the Construction Materials class.
loved the bill wurtz reference at 20:47
My dad was a civil engineer specializing in concrete, asphalt, and soils. He owned a materials testing lab and I grew up testing those materials, and eventually worked for other labs doing the same. I've broken many hundreds of concrete cylinders in the lab and done countless field tests for slump and air content. I've been out of that line of work for over 30 years now. This was the first I've seen mention of the concrete spread test, but I see it's becoming the standard, presumably due to concrete mix designs incorporating more chemical plasticizers to make the mix flow better. Back when I was in the business, plasticizers were available, but they added cost and were not commonly used.
The spread test is only done for self consolidating concrete mixtures, which ARE becoming more common, but the typical (and mostly useless) slump test still reigns for most applications.
The slump test is so there's something to hold the contractor to. Some RE's love to swing D and reject loads of the slump doesn't meet spec. With modern additives the slump can be deemed pretty useless.
@@BM-gn4gk RE here. DOT's are starting to drop slump. ACI is moving away from slump being part of the standard testing too. Personally, if the aggregate isn't sinking, and its the right consistency for the job, I'm happy.
I just finished my 5th year as a testing tech. I did it all but mostly did soils and asphalt because there was more money there.
We were working 60-70hr weeks consistently. I burned out and quit. I really did enjoy traveling all over my state, but I wish I could have at least had the weekends off.
Was your experience similar? Always working overtime?
@@chrisvids1820 I am currently doing CMT testing as a job, in fact I'm on site while writing this comment. On big projects where you travel out of city/state, overtime is extremely common. I do 10 days on 4 days off and work about 120 hours in those 10 days, not including 30 min breaks.
This video is insane. It is really good!